JP2002042791A - Method for producing electrode for battery with separator - Google Patents
Method for producing electrode for battery with separatorInfo
- Publication number
- JP2002042791A JP2002042791A JP2000229094A JP2000229094A JP2002042791A JP 2002042791 A JP2002042791 A JP 2002042791A JP 2000229094 A JP2000229094 A JP 2000229094A JP 2000229094 A JP2000229094 A JP 2000229094A JP 2002042791 A JP2002042791 A JP 2002042791A
- Authority
- JP
- Japan
- Prior art keywords
- electrode
- separator
- battery
- battery electrode
- electrophoresis
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Landscapes
- Secondary Cells (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Cell Separators (AREA)
Abstract
(57)【要約】
【課題】従来技術よりもセパレータを薄膜化できるセパ
レータ付き電池用電極の製造方法を提供すること。
【解決手段】本発明のセパレータ付き電池用電極の製造
方法は、セパレータを構成する構成材料を溶媒中に分散
させた溶液中に電池用電極を浸漬する浸漬工程と、溶液
内に電位勾配を発生させて構成材料を電気泳動により電
池用電極表面に付着させる電気泳動工程とを有する。つ
まり、電気泳動法をセパレータの形成に応用すると、電
池用電極表面のセパレータが形成されていない部分に集
中的に電流が流れるので電流密度が高くなり、その部分
に電気泳動が集中することで、セパレータが形成されて
いない部分に優先的にセパレータが形成される。したが
って、セパレータ形成が遅れている部分に優先してセパ
レータが形成されるので、結果的にセパレータが均一に
電池用電極表面に形成されることとなる。(57) [Problem] To provide a method of manufacturing an electrode for a battery with a separator, which can make the separator thinner than the prior art. A method of manufacturing a battery electrode with a separator according to the present invention includes a dipping step of dipping the battery electrode in a solution in which a constituent material of the separator is dispersed in a solvent, and generating a potential gradient in the solution. And causing the constituent material to adhere to the surface of the battery electrode by electrophoresis. In other words, when the electrophoresis method is applied to the formation of a separator, current flows intensively in a portion of the battery electrode surface where the separator is not formed, so that the current density increases, and electrophoresis concentrates in that portion. The separator is preferentially formed in a portion where the separator is not formed. Therefore, the separator is formed in preference to the portion where the formation of the separator is delayed, and as a result, the separator is uniformly formed on the surface of the battery electrode.
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、電池用電極間の絶
縁性を担保するセパレータを電池用電極の表面に一体的
に形成したセパレータ付き電池用電極の製造方法に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a battery electrode with a separator in which a separator for ensuring insulation between battery electrodes is integrally formed on the surface of the battery electrode.
【０００２】[0002]
【従来の技術】近年、ノート型パソコンや小型携帯電話
や携帯ビデオカメラ等の電源や自動車のクリーンなエネ
ルギー源としてその高い重量エネルギー密度を持ち、高
出力で大電流特性に優れた高性能二次電池の開発が盛ん
である。ここで用いられる二次電池には、小型軽量であ
りながら大容量・高出力であること、即ち高エネルギー
密度・高出力密度であることが求められている。高エネ
ルギー密度・高出力密度を達成できる二次電池として
は、リチウムイオン二次電池等の非水電解質二次電池が
有力視されている。2. Description of the Related Art In recent years, a high-performance secondary power source having a high weight energy density, a high output, and a high current characteristic has been used as a power source for a notebook personal computer, a small cellular phone, a portable video camera, and the like and a clean energy source for a vehicle. Battery development is active. The secondary battery used here is required to have a large capacity and a high output while being small and lightweight, that is, a high energy density and a high output density. As a secondary battery capable of achieving high energy density and high output density, a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery is considered to be promising.
【０００３】一般的にリチウムイオン二次電池は、リチ
ウムイオンを吸蔵および放出できる薄膜状の正極および
負極と、その間に介在・積層されたポリエチレンやポリ
プロピレン等の高分子から構成される微多孔膜であるセ
パレータと、正極と負極との間でリチウムイオンを移動
させる電解液とを備えている。In general, a lithium ion secondary battery is composed of a thin film positive electrode and a negative electrode capable of inserting and extracting lithium ions, and a microporous film composed of a polymer such as polyethylene or polypropylene interposed and laminated therebetween. It has a certain separator and an electrolyte for moving lithium ions between the positive electrode and the negative electrode.
【０００４】これらの電池要素のうちセパレータは蓄電
作用に直接関係ない要素であるので、高出力で大電流特
性に優れた二次電池とするために、セパレ−タを薄膜化
することで低抵抗化が図られている。薄膜化したセパレ
ータは製造時の取り扱いが困難であるが、電極の表面に
セパレータを一体的に形成することで解決している。[0004] Among these battery elements, the separator is an element which is not directly related to the power storage function. Therefore, in order to obtain a secondary battery having high output and excellent large current characteristics, the separator is made thin by reducing the thickness of the separator. Is being planned. Although it is difficult to handle the thinned separator at the time of manufacture, the problem is solved by integrally forming the separator on the surface of the electrode.
【０００５】従来、セパレータを電池用電極と一体的に
形成する方法としては、ポリマーを溶剤で常温あるいは
高温下で溶解し、電極などの基材に塗布（溶剤キャステ
ィング）した後、該ポリマーの貧溶媒などに浸漬させた
ポリマー溶液を貧溶媒に接触、冷却するなどして樹脂を
析出し、乾燥後多孔質膜を得る溶剤キャスト法がある。Conventionally, as a method of integrally forming a separator with a battery electrode, a polymer is dissolved in a solvent at room temperature or at a high temperature, applied to a substrate such as an electrode (solvent casting), and then the polymer is dissolved. There is a solvent casting method in which a polymer solution immersed in a solvent or the like is brought into contact with a poor solvent, cooled, or the like, to precipitate a resin, and dried to obtain a porous film.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、従来技
術によるセパレータの形成方法によると、セパレータを
薄膜化することでピンホールが発生したり、充分な引張
り・突刺し強度等の物理的特性を得ることが困難であっ
た。したがって、従来技術の方法で電池用電極上にセパ
レータを形成すると、電池用電極表面の電極活物質層が
空隙や大きい表面粗さをもつために内部短絡が発生する
ことがあり、歩留りが低下するおそれがあった。However, according to the prior art method of forming a separator, the separator is made thinner so that pinholes are generated or physical properties such as sufficient tensile and piercing strength are obtained. Was difficult. Therefore, when the separator is formed on the battery electrode by the method of the related art, an internal short circuit may occur because the electrode active material layer on the battery electrode surface has voids or large surface roughness, and the yield is reduced. There was a fear.
【０００７】そこで本発明は、従来技術の方法よりもセ
パレータを薄膜化できるセパレータ付き電池用電極の製
造方法を提供することを解決すべき課題とする。Therefore, an object of the present invention is to provide a method of manufacturing a battery electrode with a separator which can make the separator thinner than the conventional method.
【０００８】[0008]
【課題を解決するための手段】上記課題を解決する目的
で、本発明者らは鋭意研究の結果、電気泳動を応用する
ことにより実用的に問題となるピンホールのない緊密な
セパレータを形成できることを見出した。すなわち、電
気泳動法は、学会（電気化学学会 第６６回大会要旨
発表Ｎｏ．Ｐ２４）で開示された集電体表面に電極活物
質層の薄膜を形成することができる他に、電気泳動法を
セパレータの形成に応用すると、薄膜の均一化をも達成
できることを発見した。Means for Solving the Problems For the purpose of solving the above problems, the present inventors have made intensive studies and found that by using electrophoresis, it is possible to form a tight separator without pinholes, which is a practical problem. Was found. In other words, the electrophoresis method is based on the
Presentation No. In addition to forming a thin film of the electrode active material layer on the surface of the current collector disclosed in P24), it has been discovered that application of electrophoresis to the formation of a separator can also achieve uniformity of the thin film.
【０００９】すなわち、本発明のセパレータ付き電池用
電極の製造方法は、電池用電極と、該電池用電極と一体
的に形成された電池用電極間の短絡防止用のセパレータ
とをもつセパレータ付き電池用電極の製造方法であっ
て、前記セパレータを構成する構成材料を溶媒中に分散
させた溶液中に前記電池用電極を浸漬する浸漬工程と、
前記溶液内に電位勾配を発生させて前記構成材料を電気
泳動により前記電池用電極表面に付着させる電気泳動工
程とを有することを特徴とする。That is, a method of manufacturing a battery electrode with a separator according to the present invention provides a battery with a separator having a battery electrode and a separator formed integrally with the battery electrode for preventing short circuit between the battery electrodes. A method for manufacturing an electrode for a battery, an immersion step of immersing the battery electrode in a solution in which a constituent material of the separator is dispersed in a solvent,
An electrophoresis step of generating a potential gradient in the solution to attach the constituent material to the surface of the battery electrode by electrophoresis.
【００１０】つまり、電気泳動法をセパレータの形成に
応用すると、電池用電極表面のセパレータが形成されて
いない部分に集中的に電流が流れるので電流密度が高く
なり、その部分に電気泳動が集中することで、セパレー
タが形成されていない部分に優先的にセパレータが形成
される。したがって、セパレータ形成が遅れている部分
に優先してセパレータが形成されるので、結果的にセパ
レータがピンホールの形成もなく均一に電池用電極表面
に形成されることとなる。That is, when the electrophoresis method is applied to the formation of the separator, the current flows intensively in the portion of the battery electrode surface where the separator is not formed, so that the current density increases and the electrophoresis concentrates in that portion. Thus, the separator is preferentially formed in a portion where the separator is not formed. Therefore, the separator is formed in preference to the portion where the formation of the separator is delayed, and as a result, the separator is uniformly formed on the surface of the battery electrode without forming pinholes.
【００１１】そして、前記電気泳動工程において少なく
とも正極、負極からなる２種類の電極によって前記電位
勾配を発生させており、該正極および負極のうちのいず
れか一方は前記電池用電極が兼ねることが好ましい。電
池用電極に直接電圧を印加することにより、電気泳動の
制御をより精密に行うことができ、さらに電極の総数を
減らすことができる。また、電池用電極の両面にセパレ
ータを形成するために、さらに他方の電極は前記電池用
電極の両面側にそれぞれ１つずつ設けられることがより
好ましい。In the electrophoresis step, the potential gradient is generated by at least two kinds of electrodes including a positive electrode and a negative electrode, and one of the positive electrode and the negative electrode preferably serves as the battery electrode. . By directly applying a voltage to the battery electrode, the control of electrophoresis can be performed more precisely, and the total number of electrodes can be reduced. Further, in order to form separators on both sides of the battery electrode, it is more preferable that one other electrode is further provided on each side of the battery electrode.
【００１２】さらに、セパレータの形成されていない部
分を設けるために、前記電池用電極から独立した部材で
あって、該電池用電極表面の所定部位への前記構成材料
の電気泳動を阻害する遮蔽部材をもつことが好ましい。[0012] Further, in order to provide a portion where the separator is not formed, a shielding member which is independent of the battery electrode and inhibits electrophoresis of the constituent material to a predetermined portion on the surface of the battery electrode. It is preferable to have
【００１３】またさらに、前記構成材料は樹脂およびセ
ラミックスの中から選ばれる１種以上であることが形成
されるセパレータの性能の観点からは好ましい。Further, the constituent material is preferably at least one selected from a resin and a ceramic from the viewpoint of the performance of the formed separator.
【００１４】また、前記構成材料の粒子径が５０μｍ以
下であることが好ましい。粒子径を５０μｍ以下とする
と、空隙率が同じであってもより電気抵抗が小さいセパ
レータとなるからである。Preferably, the constituent material has a particle diameter of 50 μm or less. If the particle diameter is 50 μm or less, the separator will have a smaller electric resistance even if the porosity is the same.
【００１５】また、構成材料の表面電位を制御するため
に前記溶液中には、前記構成材料の表面を帯電させる帯
電剤を含むことが好ましい。It is preferable that the solution contains a charging agent for charging the surface of the constituent material in order to control the surface potential of the constituent material.
【００１６】[0016]
【発明の実施の形態】本実施形態のセパレータ付き電池
用電極の製造方法は、浸漬工程と電気泳動工程とからな
る。BEST MODE FOR CARRYING OUT THE INVENTION The method for producing an electrode for a battery with a separator according to this embodiment comprises a dipping step and an electrophoresis step.
【００１７】〔電池用電極〕本製造方法が適用できる
「電池用電極」は、どのような電池に用いられるもので
あっても良く、正極および負極のいずれかであって対極
との間に電極間の短絡防止用のセパレータを介在させて
電池が形成される電池に用いられる電池用電極である。
たとえば、リチウムイオン二次電池が例示される。そし
て、一般的な電池以外にも電気二重層キャパシタ、燃料
電池のようなものの電極をも含む意味である。[Electrode for Battery] The “electrode for battery” to which the present production method can be applied may be any type of battery, and may be any one of a positive electrode and a negative electrode and an electrode between the counter electrode and the negative electrode. It is a battery electrode used for a battery in which a battery is formed with a separator for preventing short circuit therebetween.
For example, a lithium ion secondary battery is exemplified. In addition to the general battery, the term includes an electrode of an electric double layer capacitor, a fuel cell, or the like.
【００１８】〔浸漬工程〕浸漬工程は、セパレータを構
成する構成材料を溶媒中に分散させた溶液中に電池用電
極を浸漬する工程である。この浸漬工程において、電池
用電極は全体を同時に浸漬するばかりでなく連続的に溶
液中に浸漬されても良い。[Immersion Step] The immersion step is a step of immersing the battery electrode in a solution in which the constituent materials of the separator are dispersed in a solvent. In this immersion step, the battery electrode may be immersed not only in the whole at the same time but also continuously in the solution.
【００１９】構成材料は、溶液中においてよく分散し、
かつ形成されたセパレータが微多孔質となるように、粒
子径を５０μｍ以下、特に１μｍ以下とすることが望ま
しい。また、粒度分布をよりシャープとすることで空隙
率が大きくでき、低抵抗化を図ることができるので好ま
しい。また、低抵抗化するためには同じ空隙率でも微多
孔質なほど望ましい。また、構成材料は、溶液中で分散
させる他に溶媒に溶解させて用いることもできる。The constituent materials are well dispersed in the solution,
In addition, the particle diameter is desirably 50 μm or less, particularly preferably 1 μm or less so that the formed separator becomes microporous. Further, sharpening the particle size distribution is preferable because the porosity can be increased and the resistance can be reduced. Also, in order to reduce the resistance, it is desirable that the porosity is as fine as possible even with the same porosity. The constituent material can be used by dissolving it in a solvent in addition to dispersing it in a solution.
【００２０】構成材料の溶液中への適正な含有割合は、
用いる溶媒・電気泳動工程の条件等によって大きく異な
る。これは、後述する電気泳動工程によって構成材料が
一様に電池用電極の表面に付着するのではなく構成材料
の荷電・質量等の変化により異なる溶液中での移動速度
によって付着の様子が異なるからである。また、構成材
料の荷電は使用する溶媒、溶液温度、帯電剤によっても
影響される。The proper content ratio of the constituent materials in the solution is as follows:
It varies greatly depending on the solvent used, conditions of the electrophoresis step, and the like. This is because the constituent materials do not uniformly adhere to the surface of the battery electrode in the electrophoresis process described later, but the state of adhesion differs depending on the moving speed in different solutions due to changes in the charge, mass, etc. of the constituent materials. It is. Further, the charge of the constituent material is also affected by the solvent used, the solution temperature, and the charging agent.
【００２１】セパレータの構成材料は、電池用電極が使
用される電池によって異なる。構成材料としては、後述
する電気泳動工程によって電池用電極の表面に付着させ
たときに電気絶縁性・イオン伝導性等のセパレータに求
められる性能を有するものであれば特に限定しない。た
とえば、構成材料としては、ポリエチレン、ポリプロピ
レン、ＳＢＲ等の樹脂、Ａｌ2Ｏ3、ＳｉＣ、ＳｉＯ2等
のセラミックス等の中から選ばれる１種以上の物質を前
記性質を満たす好ましい構成材料として挙げることがで
きる。特にセラミックスを構成材料に用いる場合には、
セパレータの耐熱性や突き刺し強度等の向上が期待でき
る。The constituent material of the separator differs depending on the battery in which the battery electrode is used. The constituent material is not particularly limited as long as it has performance required for a separator, such as electrical insulation and ionic conductivity, when attached to the surface of a battery electrode in an electrophoresis step described later. For example, as the constituent material, one or more substances selected from resins such as polyethylene, polypropylene, and SBR, and ceramics such as Al 2 O 3 , SiC, and SiO 2 are cited as preferable constituent materials satisfying the above properties. Can be. Especially when using ceramics as a constituent material,
Improvements in the heat resistance and piercing strength of the separator can be expected.
【００２２】さらに、構成材料として樹脂またはセラミ
ックス粒子を電極に付着させた後に、その形状を保持す
る必要がある場合は、ＰＴＦＥ（ポリテトラフルオロエ
チレン）、ＰＶＤＦ（ポリフッ化ビニリデン）等の高分
子結着剤を単独または２種以上を混合したものを構成材
料の一部として用いることが望ましい。Further, when it is necessary to maintain the shape after adhering resin or ceramic particles to the electrode as a constituent material, a polymer such as PTFE (polytetrafluoroethylene) or PVDF (polyvinylidene fluoride) is used. It is desirable to use an adhesive alone or a mixture of two or more as a part of the constituent material.
【００２３】また、セパレータの構成材料以外の物質、
たとえばセパレータの形成後に溶解することによりセパ
レータに多孔質を形成する物質、等であっても必要に応
じて混合することができる。Further, substances other than the constituent materials of the separator,
For example, a substance that forms a porosity in the separator by dissolving after the formation of the separator can be mixed as necessary.
【００２４】樹脂またはセラミックスを粉体のまま分散
させて溶液中に分散させる場合、溶媒としてはアセトン
等のケトン類およびエタノール等のアルコール類等の有
機溶剤、水、およびこれらの混合溶媒が使用できる。ま
た樹脂、セラミックスを膨潤・溶解させる溶媒を添加す
ることで、樹脂等を膨潤させ、溶液内での粒子の浮きや
沈降を低減することができる。粒子が大きい・比重が溶
媒と大きく異なるなど、安定した分散系が得られない場
合には、スタラーや超音波などで物理的に粒子を分散さ
せでも良い。When the resin or ceramics is dispersed as it is in the form of powder and dispersed in a solution, organic solvents such as ketones such as acetone and alcohols such as ethanol, water, and mixed solvents thereof can be used as the solvent. . In addition, by adding a solvent that swells and dissolves the resin and ceramics, the resin and the like can swell, and the floating and settling of particles in the solution can be reduced. When a stable dispersion system cannot be obtained because the particles are large or the specific gravity is significantly different from that of the solvent, the particles may be physically dispersed using a stirrer or ultrasonic waves.
【００２５】この時に分散質である樹脂またはセラミッ
クスに電荷を付与するためヨウ素や界面活性剤などの粒
子に電荷を付与できる帯電剤を添加しても良い。また、
溶媒中のｐＨを調整することでも、構成材料を溶媒に安
定に分散させたり、構成材料の電荷を制御することもで
きる。At this time, a charging agent capable of providing a charge to particles such as iodine or a surfactant may be added in order to provide a charge to the resin or ceramic which is a dispersoid. Also,
By adjusting the pH in the solvent, the constituent material can be stably dispersed in the solvent, and the charge of the constituent material can be controlled.
【００２６】こうした構成材料の分散安定性は、溶液の
温度の影響も受けやすいことから、溶液の温度調整を行
うことが好ましい。たとえば、温度調整の方法として
は、溶液を保持する槽内に冷却水などの熱媒を循環させ
たりすること等により達成できる。Since the dispersion stability of such constituent materials is easily affected by the temperature of the solution, it is preferable to adjust the temperature of the solution. For example, the temperature can be adjusted by circulating a heating medium such as cooling water in a tank holding the solution.
【００２７】〔電気泳動工程〕電気泳動工程は、溶液内
に電位勾配を発生させることでセパレータの構成材料を
溶液内で電気泳動させて電池用電極表面に付着させる工
程である。この電気泳動工程では、電池用電極表面の所
定部位へのセパレータの構成材料の電気泳動を阻害する
電池用電極と独立して配設された遮蔽部材を用いること
が好ましい。たとえば、集電用のリード等を形成する部
分に遮蔽部材を配設することにより、セパレータの形成
される部分を制御できる。[Electrophoresis Step] In the electrophoresis step, a constituent material of the separator is electrophoresed in the solution by generating a potential gradient in the solution and adheres to the surface of the battery electrode. In this electrophoresis step, it is preferable to use a shielding member provided independently of the battery electrode that inhibits electrophoresis of the constituent material of the separator on a predetermined portion of the battery electrode surface. For example, by arranging a shielding member at a portion where a lead for current collection or the like is formed, a portion where a separator is formed can be controlled.
【００２８】溶液内に電位勾配を発生させる方法として
は、たとえば、対向する２つの電気泳動用電極に電圧を
印加することで達成できる。電気泳動用電極の形状は、
電池用電極の表面に均一に構成材料が付着するように、
溶液内で電池用電極が通過する部分の電位勾配が一定と
することができる形状が好ましい。たとえば、電気泳動
用電極の大きさを電池用電極が通過する部分を覆うのに
充分な大きさとする。そして、電気泳動用電極のいずれ
か一方は溶液内に浸漬された電池用電極が兼ねることが
できる。電池用電極を電気泳動用電極とすることで、直
接、構成材料を電池用電極に付着させることができる。
なお、溶液内に発生させる電位勾配の向きは、構成材料
等の溶液内における帯電電位により決定される。すなわ
ち、帯電した構成材料等が電池用電極方向に移動するよ
うに電位勾配が決定される。たとえば、構成材料を正に
帯電させた場合は電池用電極を負極とする。また、電気
泳動用電極の数は２つに限られず、必要に応じて３以上
としても良い。たとえば、電池用電極の両面にセパレー
タ層を形成したい場合に、電池用電極を正極とし、２つ
の負極を電池用電極の両面に設けることで電池用電極の
両面に構成材料を付着させセパレータを形成することが
できる。A method of generating a potential gradient in the solution can be achieved by, for example, applying a voltage to two opposing electrodes for electrophoresis. The shape of the electrophoresis electrode is
In order for the constituent material to adhere uniformly to the surface of the battery electrode,
A shape that allows a constant potential gradient in a portion where the battery electrode passes in the solution is preferable. For example, the size of the electrophoresis electrode is set to be large enough to cover a portion through which the battery electrode passes. One of the electrophoresis electrodes can also serve as a battery electrode immersed in the solution. By using the battery electrode as the electrophoresis electrode, the constituent material can be directly attached to the battery electrode.
The direction of the potential gradient generated in the solution is determined by the charged potential of the constituent materials and the like in the solution. That is, the potential gradient is determined so that the charged constituent material moves in the direction of the battery electrode. For example, when the constituent material is positively charged, the battery electrode is used as the negative electrode. The number of electrodes for electrophoresis is not limited to two, but may be three or more as necessary. For example, when it is desired to form a separator layer on both sides of a battery electrode, the battery electrode is used as a positive electrode, and two negative electrodes are provided on both sides of the battery electrode, whereby a constituent material is attached to both sides of the battery electrode to form a separator. can do.
【００２９】電気泳動用電極に印加する電圧、電圧印加
時間等の条件としては特に限定されず、電池用電極表面
に形成されるべきセパレータの厚さ、空隙率、組成等に
応じて適宜選択される。電圧を高くすれば、セパレータ
が緊密化し空隙率が小さくなる。ヨウ素添加アセトン溶
液を溶媒に用いた場合に好ましい印加電圧としては５〜
１０００Ｖ程度を挙げることができる。また、電圧を印
加する時間を長くすると、電池用電極表面のセパレータ
が厚くなる。また、構成材料以外に溶媒に分散させた物
質は、その性質により溶液中での表面電位が異なり電気
泳動の速度が異なるので電気泳動用電極に印加する電圧
を目的のセパレータ組成・構造となるように調節する。
なお、電池用電極表面に形成するセパレータの厚さは電
池用電極片面当たり好ましくは５０μｍ以下、より好ま
しくは２５μｍ以下、さらに好ましくは１０μｍ以下と
する。セパレータの厚さが薄い方が電池の内部抵抗が低
くなりより高出力の電池を提供できるからである。この
ように薄いセパレータは従来の溶剤キャスト法等では精
度の高い形成が困難であった。それに対し電気泳動法に
よると、電気泳動は電位勾配の大きい部分に優先的に構
成材料が付着するのでセパレータの厚さに不均等が生じ
るとセパレータが薄い部分から構成材料が付着して形成
されるセパレータの厚さは一定になるという利点があ
る。The conditions such as the voltage applied to the electrophoresis electrode and the voltage application time are not particularly limited, and are appropriately selected according to the thickness, porosity, composition, etc. of the separator to be formed on the battery electrode surface. You. When the voltage is increased, the separator becomes tight and the porosity decreases. When an iodine-added acetone solution is used as a solvent, a preferable applied voltage is 5 to 5.
About 1000 V can be mentioned. Further, when the time for applying the voltage is increased, the thickness of the separator on the surface of the battery electrode increases. In addition, substances dispersed in a solvent other than the constituent materials have different surface potentials in solution due to their properties, and the speed of electrophoresis is different, so that the voltage applied to the electrophoresis electrode should be the desired separator composition and structure. Adjust to.
The thickness of the separator formed on the surface of the battery electrode is preferably 50 μm or less, more preferably 25 μm or less, and still more preferably 10 μm or less per one surface of the battery electrode. This is because the smaller the thickness of the separator, the lower the internal resistance of the battery and the higher the output of the battery. It was difficult to form such a thin separator with high precision by a conventional solvent casting method or the like. On the other hand, according to the electrophoresis method, in the electrophoresis, the constituent material adheres preferentially to a portion having a large potential gradient, so that when the thickness of the separator becomes uneven, the constituent material is attached from the thin portion of the separator. There is an advantage that the thickness of the separator is constant.
【００３０】遮蔽部材は、電池用電極のセパレータを形
成させたくない部位に近接して設けられる。遮蔽部材と
電池用電極との隙間は小さい方がセパレータの構成材料
の不必要な部分への回り込みが少なくなる。また、遮蔽
部材は構成材料が移動する側と反対の電気泳動用電極の
電位よりも構成材料が移動する側の電気泳動用電極の電
位に近く調節されることが好ましい。さらに、遮蔽部材
は電池用電極と同電位に調節されることがより好まし
い。電位を調節することにより、遮蔽部材と電池用電極
との隙間に電位勾配が少なくなるので、電池用電極への
セパレータの付着が少なくなるからである。そして、遮
蔽部材は絶縁体とすることもできる。The shielding member is provided close to a portion of the battery electrode where the separator is not desired to be formed. The smaller the gap between the shielding member and the battery electrode, the less the material of the separator wrapping around into unnecessary parts. Further, it is preferable that the shielding member is adjusted to be closer to the potential of the electrophoresis electrode on the side where the constituent material moves than to the potential of the electrophoresis electrode opposite to the side where the constituent material moves. More preferably, the shielding member is adjusted to the same potential as the battery electrode. By adjusting the potential, the potential gradient is reduced in the gap between the shielding member and the battery electrode, so that the adhesion of the separator to the battery electrode is reduced. And the shielding member can also be an insulator.
【００３１】また、電気泳動工程においても溶液内の構
成材料が沈殿しないように何らかの方法で溶液の攪拌を
続けることが好ましい。In the electrophoresis step, it is preferable to continue stirring the solution by any method so that the constituent materials in the solution do not precipitate.
【００３２】[0032]
【実施例】以下に実施例に基づき詳細に説明するが、本
発明は下記の実施例に限定されるものではない。EXAMPLES The present invention will be described in detail below with reference to examples, but the present invention is not limited to the following examples.
【００３３】（電池用電極の製造）ＮＭＰに溶解したフ
ッ化ビニリデン−ヘキサフルオロプロピレン共重合体
（結着材）、ニッケル酸リチウム（正極活物質）、ゲッ
チェンブラック（導電材）からなるリチウムイオン二次
電池用正極合剤ペーストを集電体としてのアルミ箔に塗
布・乾燥後プレス成形することで電池用電極としての正
極を得た。(Manufacture of battery electrode) Lithium ion composed of vinylidene fluoride-hexafluoropropylene copolymer dissolved in NMP (binder), lithium nickelate (cathode active material), and Gethene black (conductive material) A positive electrode as a battery electrode was obtained by applying the positive electrode mixture paste for a secondary battery to an aluminum foil as a current collector, drying and pressing.
【００３４】次にＮＭＰに溶解したフッ化ビニリデン−
ヘキサフルオロプロピレン共重合体（結着材）及びグラ
ファイト（負極活物質）からなるリチウムイオン二次電
池用負極合剤ペーストを集電体としての銅箔に塗布し乾
燥後プレス成形することで電池用電極としての負極を作
製した。Next, vinylidene fluoride dissolved in NMP
A negative electrode mixture paste for lithium ion secondary batteries, consisting of a hexafluoropropylene copolymer (binder) and graphite (negative electrode active material), is applied to a copper foil as a current collector, dried and press-molded to form a battery. A negative electrode was prepared as an electrode.
【００３５】これらの正極・負極を用いて以下の実施例
を説明する。The following examples will be described using these positive and negative electrodes.
【００３６】（セパレータ付き電池用電極の製造装置）
図１に示すセパレータ付き電池用電極の製造装置を用い
てセパレータ付き電池用電極を製造した。本製造装置は
ロール状に巻回された電池用電極１０を保持し送出する
送出手段１と溶液槽２と溶液槽２内に設けられた２枚の
電極板３１、３２とその電極板３１、３２の間の電池用
電極１０進行方向に向かって右側に電池用電極１０の厚
さ程度の隙間をあけて設けられた金属製の遮蔽部材５
１、５２と溶液槽２内の電極板３１、３２および遮蔽部
材５１、５２の間に電池用電極１０が通過して溶液内に
浸漬するように保持するガイド６、７、８、９と電池用
電極１０を巻き取る取込手段４とからなる。そして電圧
の制御が可能な直流電源９０の負極を送出手段１を介し
て電池用電極１０に接続し、正極を電極板３１、３２お
よび遮蔽部材５１、５２に接続する。これにより遮蔽部
材５１、５２と電池用電極１０とは等電位となる。(Device for manufacturing battery electrode with separator)
A battery electrode with a separator was manufactured using the apparatus for manufacturing a battery electrode with a separator shown in FIG. The present manufacturing apparatus includes a delivery unit 1 for holding and sending a battery electrode 10 wound in a roll shape, a solution tank 2, and two electrode plates 31 and 32 provided in the solution tank 2, and the electrode plates 31 and 32. 32, a metal shielding member 5 provided on the right side in the traveling direction of the battery electrode 10 with a gap of about the thickness of the battery electrode 10.
Guides 6, 7, 8, 9 for holding the battery electrode 10 so as to pass through and be immersed in the solution between the electrode plates 1, 52 and the electrode plates 31, 32 and the shielding members 51, 52 in the solution tank 2 and the battery And a take-up means 4 for winding up the electrode 10. Then, the negative electrode of the DC power supply 90 whose voltage can be controlled is connected to the battery electrode 10 via the sending means 1, and the positive electrode is connected to the electrode plates 31 and 32 and the shielding members 51 and 52. Thereby, the shielding members 51 and 52 and the battery electrode 10 become equipotential.
【００３７】したがって、図２に示すように、電極板３
１、３２から電池用電極１０の方向へ電気泳動されたセ
パレータの構成材料は遮蔽部材５１、５２によって遮蔽
されるので、電池用電極１０のＢの部分にはセパレータ
が形成されない。遮蔽部材５１、５２は電池用電極１０
と同電位に調節されているので、遮蔽部材５１、５２と
電池用電極１０との間にセパレータの構成材料が回り込
む量を減らすことができる。なお、図２においてＡは電
池用電極１０上にセパレータが付着した部分を示す。Therefore, as shown in FIG.
Since the constituent materials of the separator electrophoresed from 1 and 32 toward the battery electrode 10 are shielded by the shielding members 51 and 52, no separator is formed at the portion B of the battery electrode 10. The shielding members 51 and 52 are used for the battery electrode 10.
Therefore, the amount of the component material of the separator flowing between the shielding members 51 and 52 and the battery electrode 10 can be reduced. In FIG. 2, A indicates a portion where the separator is attached on the battery electrode 10.
【００３８】送出手段１に保持された電池用電極１０
は、ガイド６、７、８、９により溶液槽２内を通過し取
込手段３により取り込まれる。The battery electrode 10 held by the sending means 1
Is passed through the solution tank 2 by guides 6, 7, 8, and 9, and is taken in by the taking-in means 3.
【００３９】（粒径の測定方法）日機装株式会社製「Ｈ
ＲＡ９３２０−Ｘ１００型マイクロトラック」を用い
て、粒度分布を測定し、中心粒径Ｄ５０およびＤ１０、
Ｄ９０を求めた。(Method for measuring particle size) "H" manufactured by Nikkiso Co., Ltd.
The particle size distribution was measured using “RA9320-X100 type microtrack”, and the center particle diameters D50 and D10,
D90 was determined.
【００４０】（実施例１）溶液槽２内に入れる溶液とし
ては、溶媒としてのアセトン１００重量部に対して、セ
パレータの構成材料として粒度分布がＤ５０：８．０μ
ｍ、Ｄ１０：３．２μｍ、Ｄ９０：１２．８μｍのポリ
エチレンを１重量部の割合で混合した。さらに、アセト
ン１００重量部に対して、帯電剤としての０．５ｍｏｌ
／Ｌヨウ素アセトン溶液を０．５重量部添加した。これ
らの混合溶液を５分間超音波分散を行い充分に分散し
た。(Example 1) As a solution to be put into the solution tank 2, a particle size distribution as a constituent material of the separator was D50: 8.0μ with respect to 100 parts by weight of acetone as a solvent.
m, D10: 3.2 μm, and D90: 12.8 μm polyethylene were mixed at a ratio of 1 part by weight. Further, with respect to 100 parts by weight of acetone, 0.5 mol as a charging agent
/ L iodine acetone solution was added by 0.5 part by weight. These mixed solutions were sufficiently dispersed by ultrasonic dispersion for 5 minutes.
【００４１】電池用電極１０は上述の方法で厚さ１０μ
ｍのＣｕの集電体上にグラファイトとバインダを重量比
９２．５：７．５の割合で形成された電極を使用した。
電気泳動用電極３１、３２としてセパレータを両面に形
成させるため両側に１０ｍｍの距離をおいてＳＵＳ製電
極を設置した。The battery electrode 10 has a thickness of 10 μm by the method described above.
An electrode in which graphite and a binder were formed at a weight ratio of 92.5: 7.5 on a m current collector of Cu was used.
In order to form separators on both sides as electrodes 31 and 32 for electrophoresis, SUS electrodes were installed at a distance of 10 mm on both sides.
【００４２】電気泳動条件は印加電圧４００Ｖで泳動時
間はセパレータの膜厚が２５μｍ、空隙率５０％となる
ようにセパレータを形成させるための電極の送り速度を
調節した。電気泳動により形成した電極を乾燥した後、
コイン型電池を作製し、内部抵抗を測定した結果、短絡
せず歩留りの高い電極が得られた。また、この時の抵抗
値を１．０とし、以下の実施例の基準とした。The electrophoresis conditions were such that the applied voltage was 400 V, the electrophoresis time was adjusted, and the electrode feed speed for forming the separator was adjusted so that the thickness of the separator was 25 μm and the porosity was 50%. After drying the electrode formed by electrophoresis,
As a result of producing a coin-type battery and measuring the internal resistance, an electrode having a high yield without short-circuit was obtained. The resistance value at this time was set to 1.0, which was used as a reference in the following examples.
【００４３】（実施例２）ポリエチレンの粒度分布がＤ
５０：２．０μｍ、１０：０．８μｍ、Ｄ９０：３．２
μｍであり、セパレータの膜厚を１０μｍとなるように
電池用電極１０の送り速度を調節した以外は実施例１と
同じ条件で作製した結果、空隙率が５０％、抵抗値は
０．８７であった。Example 2 The particle size distribution of polyethylene was D
50: 2.0 μm, 10: 0.8 μm, D90: 3.2
μm, and the film was produced under the same conditions as in Example 1 except that the feed rate of the battery electrode 10 was adjusted so that the thickness of the separator was 10 μm. As a result, the porosity was 50% and the resistance value was 0.87. there were.
【００４４】（実施例３）ポリエチレンの粒度分布がＤ
５０：０．８μｍ、Ｄ１０：０．３μｍ、Ｄ９０：１．
３μｍである以外は実施例２と同じ条件で作製した結
果、空隙率が５０％、抵抗値は０．８１であった。Example 3 Polyethylene has a particle size distribution of D
50: 0.8 μm, D10: 0.3 μm, D90: 1.
As a result of fabricating under the same conditions as in Example 2 except that the thickness was 3 μm, the porosity was 50% and the resistance value was 0.81.
【００４５】（実施例４）ポリエチレンの粒度分布がＤ
５０：８．０μｍ、Ｄ１０：４．８μｍ、Ｄ９０：１
１．２μｍであり、セパレータの膜厚を２５μｍとなる
ように電池用電極１０の送り速度を調節した以外は実施
例１と同じ条件で作製した結果、空隙率が５５％、抵抗
値は０．９５であった。Example 4 The particle size distribution of polyethylene was D
50: 8.0 μm, D10: 4.8 μm, D90: 1
It was manufactured under the same conditions as in Example 1 except that the feed rate of the battery electrode 10 was adjusted so that the thickness of the separator was 25 μm. 95.
【００４６】（実施例５）電池用電極１０として上述の
方法で厚さ１５μｍのＡｌの集電体上にニッケル酸リチ
ウムとゲッチェンブラックとフッ化ビニリデン−ヘキサ
フルオロプロピレン共重合体を重量比８５：１０：５の
割合で形成された電極を使用した以外は実施例１と同じ
条件で作製した結果、空隙率が５０％、抵抗値は０．９
９であった。Example 5 As a battery electrode 10, lithium nickelate, gethene black, and vinylidene fluoride-hexafluoropropylene copolymer were used in a weight ratio of 85 on an Al current collector having a thickness of 15 μm as described above. : 10: 5, except that the electrodes were formed under the same conditions as in Example 1, except that the porosity was 50% and the resistance value was 0.9.
Nine.
【００４７】（実施例６）ポリエチレンに代えて粒度分
布がＤ５０：８．０μｍ、Ｄ１０：３．２μｍ、Ｄ９
０：１２．８μｍであるポリプロピレンを用いた以外は
実施例１と同じ条件で作製した結果、空隙率が５０％、
抵抗値は０．９９であった。Example 6 Instead of polyethylene, the particle size distribution was D50: 8.0 μm, D10: 3.2 μm, D9
0: 12.8 μm, the porosity was 50%, as a result of being produced under the same conditions as in Example 1 except that polypropylene was used.
The resistance value was 0.99.
【００４８】（実施例７）溶液として溶媒としての水１
００重量部に対して、構成材料としての粒度分布がＤ５
０：８．０μｍ、Ｄ１０：３．２μｍ、Ｄ９０：１２．
８μｍのＡｌ2Ｏ3およびＰＴＦＥ（Ｄ５０：０．１μ
ｍ）を重量比９５：５の割合で混合したものを１重量部
混合した溶液を用い、電気泳動条件を印加電圧５０Ｖで
泳動時間をセパレータの膜厚が２５μｍ、空隙率が５０
％となるように形成する電池用電極１０の送り速度を調
節した以外は実施例１と同じ条件で作製した結果、空隙
率５０％、抵抗値は０．９９であった。Example 7 Water 1 as Solvent as a Solution
The particle size distribution as a constituent material is D5
0: 8.0 μm, D10: 3.2 μm, D90: 12.
8 μm of Al 2 O 3 and PTFE (D50: 0.1 μm
m) was mixed at a weight ratio of 95: 5, and a solution obtained by mixing 1 part by weight was used. The electrophoresis conditions were as follows: the applied voltage was 50 V, the migration time was 25 minutes, and the porosity was 50 μm.
%, The porosity was 50% and the resistance value was 0.99 as a result of manufacturing under the same conditions as in Example 1 except that the feed rate of the battery electrode 10 formed was adjusted to be 0.1%.
【００４９】（比較例１）ＮＭＰ８０重量部にＰＶＤＦ
を２０重量部溶解した溶液をブレードコータを用いて、
上述の負極上に膜厚２５μｍとなるようにギャップを調
整し塗布した後、水中で２分間浸漬することで高分子膜
を得た。得られた電極を乾燥した後、コイン型電池を作
製したが、電極の空隙率や表面状態に大きく影響され，
ピンホールが多く短絡した。Comparative Example 1 PVDF was added to 80 parts by weight of NMP.
Using a blade coater, a solution obtained by dissolving 20 parts by weight of
After adjusting and applying the gap so as to have a film thickness of 25 μm on the above-described negative electrode, it was immersed in water for 2 minutes to obtain a polymer film. After the obtained electrode was dried, a coin-type battery was manufactured. However, it was greatly affected by the porosity and surface condition of the electrode.
Many pinholes short-circuited.
【００５０】以上のように、本発明の製造方法による
と、電池用電極の表面状態・空隙率等に影響されること
なく頑強でかつ薄いセパレータを電池用電極の表面に一
体的に形成することができるという利点がある。また、
溶剤キャスト法等のように高分子溶液を塗布した後の析
出工程等の工程を経ることなく少ない工程・短い時間で
セパレータ付き電池用電極を製造することができるとい
う利点もある。また、セパレータを従来のものよりも容
易に薄くすることができるので、電池の内部抵抗につい
ても低いものを提供できるという利点がある。また、セ
パレータの空隙率、厚さを容易に調節することができる
という利点がある。As described above, according to the manufacturing method of the present invention, a robust and thin separator is integrally formed on the surface of the battery electrode without being affected by the surface condition, porosity, etc. of the battery electrode. There is an advantage that can be. Also,
There is also the advantage that the battery electrode with the separator can be manufactured in a small number of steps and in a short time without going through a step such as a precipitation step after applying the polymer solution as in a solvent casting method or the like. In addition, since the separator can be easily thinned as compared with the conventional separator, there is an advantage that a separator having a low internal resistance can be provided. Further, there is an advantage that the porosity and thickness of the separator can be easily adjusted.
【００５１】[0051]
【発明の効果】以上のように本発明の製造方法による
と、従来技術の方法よりもセパレータを薄膜化できるセ
パレータ付き電池用電極の製造方法を提供することがで
きるという効果を有する。As described above, according to the manufacturing method of the present invention, it is possible to provide a method of manufacturing an electrode for a battery with a separator capable of making the separator thinner than the conventional method.
【図１】実施例で用いた製造装置の概略図である。FIG. 1 is a schematic diagram of a manufacturing apparatus used in an example.
【図２】実施例で用いた製造装置の電極板と遮蔽部材と
の配置の様子を示した図である。FIG. 2 is a diagram showing an arrangement of an electrode plate and a shielding member of the manufacturing apparatus used in the example.
１…送出手段 １０…電池用電極 Ａ…電池用電極
（セパレータ形成部） Ｂ…電池用電極（セパレータ
未形成部） ２…溶液槽 ３１、３２…電極板
４…取込手段 ５１、５２…遮蔽部材 ６、７、
８、９…ガイド ９０…直流電源DESCRIPTION OF SYMBOLS 1 ... Sending means 10 ... Battery electrode A ... Battery electrode (separator formation part) B ... Battery electrode (separator non-formation part) 2: Solution tank 31, 32 ... Electrode plate
4: intake means 51, 52: shielding member 6, 7,
8, 9: Guide 90: DC power supply
フロントページの続き (72)発明者 上嶋 啓史 愛知県刈谷市昭和町１丁目１番地 株式会 社デンソー内 (72)発明者 山田 学 愛知県刈谷市昭和町１丁目１番地 株式会 社デンソー内 Ｆターム(参考） 5H021 BB00 BB12 CC04 CC20 EE04 EE10 EE22 HH03 5H029 AJ14 AK03 AL07 BJ03 BJ12 CJ11 CJ13 CJ22 CJ28 DJ04 DJ13 EJ05 EJ08 EJ12 HJ05 5H050 AA19 BA17 CA08 CB08 DA09 DA19 EA12 EA14 EA23 EA24 FA02 FA13 FA18 GA11 GA13 GA22 GA27 HA05 Continued on the front page (72) Inventor Keishi Uejima 1-1-1, Showa-cho, Kariya-shi, Aichi Prefecture Inside Denso, Inc. (72) Inventor Manabu Gakumi 1-1-1, Showa-cho, Kariya-shi, Aichi Prefecture F-term, Inside Denso Corporation (Reference) 5H021 BB00 BB12 CC04 CC20 EE04 EE10 EE22 HH03 5H029 AJ14 AK03 AL07 BJ03 BJ12 CJ11 CJ13 CJ22 CJ28 DJ04 DJ13 EJ05 EJ08 EJ12 HJ05 5H050 AA19 BA17 CA08 CB08 DA09 DA19 EA13 GA24
Claims (7)
形成された電池用電極間の短絡防止用のセパレータとを
もつセパレータ付き電池用電極の製造方法であって、 前記セパレータを構成する構成材料を溶媒中に分散させ
た溶液中に前記電池用電極を浸漬する浸漬工程と、 前記溶液内に電位勾配を発生させて前記構成材料を電気
泳動により前記電池用電極表面に付着させる電気泳動工
程とを有することを特徴とするセパレータ付き電池用電
極の製造方法。1. A method for producing a battery electrode with a separator, comprising: a battery electrode; and a separator for preventing short circuit between the battery electrode formed integrally with the battery electrode. An immersion step of immersing the battery electrode in a solution in which a constituent material to be dispersed is dispersed in a solvent; and an electricity generating a potential gradient in the solution and causing the constituent material to adhere to the surface of the battery electrode by electrophoresis. And a method for producing an electrode for a battery with a separator.
極、負極からなる２種類の電極によって前記電位勾配を
発生させており、該正極および該負極のいずれか一方は
前記電池用電極が兼ねる請求項１に記載のセパレータ付
き電池用電極の製造方法。2. The battery according to claim 1, wherein, in the electrophoresis step, the potential gradient is generated by at least two types of electrodes including a positive electrode and a negative electrode, and one of the positive electrode and the negative electrode also serves as the battery electrode. A method for producing an electrode for a battery with a separator according to the above.
極、負極からなる２種類の電極によって前記電位勾配を
発生させており、該正極および該負極のいずれか一方は
前記電池用電極が兼ね、他方は前記電池用電極の両面側
にそれぞれ１つずつ設けられる請求項１に記載のセパレ
ータ付き電池用電極の製造方法。3. In the electrophoresis step, the potential gradient is generated by at least two types of electrodes including a positive electrode and a negative electrode, and one of the positive electrode and the negative electrode also serves as the battery electrode, and the other is the battery electrode. The method for producing a battery electrode with a separator according to claim 1, wherein one battery electrode is provided on both sides of the battery electrode.
から独立した部材であって、該電池用電極表面の所定部
位への前記構成材料の電気泳動を阻害する遮蔽部材をも
つ請求項１に記載のセパレータ付き電池用電極の製造方
法。4. The electrophoresis step according to claim 1, further comprising a shielding member that is independent of the battery electrode and that inhibits electrophoresis of the constituent material to a predetermined site on the battery electrode surface. A method for producing an electrode for a battery with a separator according to the above.
の中から選ばれる１種以上である請求項１に記載のセパ
レータ付き電池用電極の製造方法。5. The method according to claim 1, wherein the constituent material is at least one selected from a resin and a ceramic.
ある請求項１に記載のセパレータ付き電池用電極の製造
方法。6. The method for producing an electrode for a battery with a separator according to claim 1, wherein the particle diameter of the constituent material is 50 μm or less.
は前記構成材料の表面に帯電させる帯電剤を含む請求項
１に記載のセパレータ付き電池用電極の製造方法。7. The method for producing a battery electrode with a separator according to claim 1, wherein in the electrophoresis step, the solution contains a charging agent for charging the surface of the constituent material.
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| JP2000229094A JP4407020B2 (en) | 2000-07-28 | 2000-07-28 | Method for producing electrode for battery with separator |
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