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JP2008004288A - Method for producing active material-containing molded body - Google Patents

Method for producing active material-containing molded body Download PDF

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JP2008004288A
JP2008004288A JP2006170180A JP2006170180A JP2008004288A JP 2008004288 A JP2008004288 A JP 2008004288A JP 2006170180 A JP2006170180 A JP 2006170180A JP 2006170180 A JP2006170180 A JP 2006170180A JP 2008004288 A JP2008004288 A JP 2008004288A
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active material
nickel foam
porous
porous nickel
foam
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JP5134785B2 (en
JP2008004288A5 (en
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Kazuo Tsutsumi
香津雄 堤
Kazuya Nishimura
和也 西村
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Kawasaki Heavy Industries Ltd
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    • 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

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Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of efficiently manufacturing an active material content molding body to be a cathode or an anode. <P>SOLUTION: Porous nickel foam 2 is immersed in a slurry 6 made of thermoplastic resin in a molten fluid state containing nickel hydroxide powder, and then, the porous nickel foam 2 is cooled by fans 10a, 10b. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は活物質含有成形体の製造方法に関する。   The present invention relates to a method for producing an active material-containing molded body.

近年、携帯用や移動用や据置き用等に用いられているアルカリ電池に対して高性能、高安全性、優れた長期貯蔵性等の高品質化の追求が進んでいる。特に、最近注目されているハイブリッド車や電動工具などには高出力が要求され、これに用いられるアルカリ電池も高出力、高エネルギー密度のものとすることが求められている。   In recent years, the pursuit of high quality such as high performance, high safety, and excellent long-term storage has been advanced for alkaline batteries used for portable use, mobile use, stationary use, and the like. In particular, high power is required for hybrid vehicles and electric tools that have recently been attracting attention, and alkaline batteries used therefor are required to have high output and high energy density.

アルカリ電池を高出力、高エネルギー密度のものとするには、原理的には電極の厚さを薄くし、セパレータについても薄くすることで達成することができる。例えば、ニッケル水素電池は、正極としてはニッケル極を用い、負極としては水素を吸蔵・放出できる合金を充填した水素極が用いられている。この負極の水素極は、主に、パンチングメタル等からなる二次元構造の基材に水素吸蔵合金粉末を含むペーストを塗布し、加圧することによって得られる電極が用いられることが多い。また、正極と負極を分離するセパレータは電気化学反応に寄与しない電池材料であるから、電池中に多くの容積を占めれば、それだけ電池容量は低下し、出力も低下するので、これを避けるために、極薄（約２００μｍ程度の厚さ）のポリオレフィン不織布が用いられている。   In principle, an alkaline battery having high output and high energy density can be achieved by reducing the thickness of the electrode and the separator. For example, a nickel metal hydride battery uses a nickel electrode as a positive electrode and a hydrogen electrode filled with an alloy capable of occluding and releasing hydrogen as a negative electrode. In many cases, the negative electrode hydrogen electrode is an electrode obtained by applying a paste containing a hydrogen storage alloy powder to a base material having a two-dimensional structure mainly made of punching metal or the like and pressurizing the paste. In addition, since the separator that separates the positive electrode and the negative electrode is a battery material that does not contribute to the electrochemical reaction, if it occupies a large volume in the battery, the battery capacity decreases and the output also decreases. In addition, an ultra-thin (thickness of about 200 μm) polyolefin nonwoven fabric is used.

一方、正極のニッケル極については、活物質である水酸化ニッケルをコバルト化合物で被覆して導電性を向上させる等の改良がなされているが、それでも負極の活物質である水素吸蔵合金と比較すると導電性が劣る。このため、正極のニッケル極においては、発泡状多孔体に活物質を充填した三次元構造とすることによって性能の向上が図られている。この場合、ニッケル極用基材として負極と同様にパンチングメタル等の二次元構造の基材を用いれば、ニッケル極の低価格化が可能であり、極めて薄い電極とすれば、出力の低下が少なくなると思われるが、薄肉化には限界があり、薄肉化を達成するためには同時に優れた導電剤と結着剤を開発することが必要である。このような点から、二次元構造のニッケル極は実現されていない。上記した従来の正・負極の構造については、例えば、特許文献１に記載されている。   On the other hand, the nickel electrode of the positive electrode has been improved, such as improving the conductivity by coating nickel hydroxide, which is an active material, with a cobalt compound, but still compared with the hydrogen storage alloy that is the active material of the negative electrode The conductivity is inferior. For this reason, in the nickel electrode of the positive electrode, the performance is improved by adopting a three-dimensional structure in which a foamed porous body is filled with an active material. In this case, if a base material having a two-dimensional structure such as a punching metal is used as the base material for the nickel electrode, the price of the nickel electrode can be reduced. However, there is a limit to thinning, and in order to achieve thinning, it is necessary to simultaneously develop an excellent conductive agent and binder. From these points, a two-dimensional nickel electrode has not been realized. The above-described conventional positive / negative electrode structures are described in Patent Document 1, for example.

このような理由により、正極のニッケル極は発泡状多孔体に活物質を充填した三次元構造とすることが一般的であり、また、必要に応じて負極の水素極にも三次元構造が採用されることがある。例えば、ニッケル極は通常、次に説明するように、まず、発泡状多孔体（例えば、多孔ニッケルフォーム）を得、その多孔ニッケルフォームに活物質を含浸させるという方法で製造されている。
（１）多孔ニッケルフォームの製造
（イ）ウレタン発泡体（ウレタンフォーム）へのニッケルメッキ
まず、ウレタンフォームを公知の製法に従って製造し、そのウレタンフォームにパラジウムを付着し、さらに、そのパラジウムを付着したウレタンフォームに電解ニッケルメッキを施すと、ニッケルメッキウレタンフォームが得られる。
（ロ）ニッケルの発泡体（ニッケルフォーム）の製造
そして、そのニッケルメッキウレタンフォームを焼成すると、ウレタンを構成する有機物である炭素と水素はＣＯ2とＨ2Ｏに熱分解されるので、ニッケルの発泡体（ニッケルフォーム）が得られる。そのニッケルフォームをさらに水素で還元すると、約９０〜９５％の気孔率の多孔ニッケルフォームが得られる。
（２）多孔ニッケルフォームへの正極活物質の含浸
図２に示すように、多孔ニッケルフォームをロール状に巻き付けたロール状多孔ニッケルフォーム２１を巻き戻して、多孔ニッケルフォーム２２を活物質含浸槽２３内の水酸化ニッケル粉末を含有する水溶液２４（常温）に浸漬して水酸化ニッケル粉末を多孔ニッケルフォーム２２に含浸させ、次に、その湿潤多孔ニッケルフォーム２２を上下の乾燥機２５ａと２５ｂから噴き出される熱風により乾燥させ、乾燥後の多孔ニッケルフォーム２２を上下２段の圧延ロール２６ａと２６ｂから構成される圧延機により圧延した後、ロール状に巻き取って、正極活物質（水酸化ニッケル粉末）を含有するロール状多孔ニッケルフォーム２７が製造されている。 For these reasons, it is common for the nickel electrode of the positive electrode to have a three-dimensional structure in which a foamed porous material is filled with an active material, and if necessary, a three-dimensional structure is also adopted for the hydrogen electrode of the negative electrode. May be. For example, as described below, a nickel electrode is usually manufactured by first obtaining a foamed porous body (for example, a porous nickel foam) and impregnating the porous nickel foam with an active material.
(1) Manufacture of porous nickel foam (a) Nickel plating on urethane foam (urethane foam) First, urethane foam was produced according to a known production method, palladium was adhered to the urethane foam, and the palladium was further adhered. When electrolytic nickel plating is applied to urethane foam, nickel-plated urethane foam is obtained.
(B) Manufacture of nickel foam (nickel foam) And, when the nickel-plated urethane foam is baked, carbon and hydrogen, which are organic substances constituting urethane, are thermally decomposed into CO 2 and H 2 O. A foam (nickel foam) is obtained. When the nickel foam is further reduced with hydrogen, a porous nickel foam with a porosity of about 90-95% is obtained.
(2) Impregnation of positive electrode active material into porous nickel foam As shown in FIG. 2, a rolled porous nickel foam 21 in which a porous nickel foam is wound in a roll shape is rewound, and the porous nickel foam 22 is placed in an active material impregnation tank 23. The porous nickel foam 22 is impregnated with the nickel hydroxide powder by being immersed in an aqueous solution 24 (normal temperature) containing the nickel hydroxide powder, and then the wet porous nickel foam 22 is sprayed from the upper and lower dryers 25a and 25b. The dried porous nickel foam 22 is rolled by a rolling mill composed of upper and lower two-stage rolling rolls 26a and 26b, and wound up into a roll shape to obtain a positive electrode active material (nickel hydroxide powder). ) Containing a rolled porous nickel foam 27 is produced.

正極活物質を含有するロール状多孔ニッケルフォームは上記のようにして製造されるのが一般的であり、この場合、水酸化ニッケル粉末を含有する水溶液２４に浸漬した多孔ニッケルフォーム２２を効率的に乾燥するためには大量の熱風を吹きつける必要がある。それでも確実に乾燥するためには、多孔ニッケルフォーム２２の処理速度を低く抑えて十分な時間をかけて乾燥する必要がある。このように、従来の製造方法では、乾燥工程が律速となって、活物質を含有する多孔ニッケルフォームの生産能率は低かった。
特開２００５−７１７８８号公報 The rolled porous nickel foam containing the positive electrode active material is generally produced as described above. In this case, the porous nickel foam 22 immersed in the aqueous solution 24 containing nickel hydroxide powder is efficiently used. In order to dry, it is necessary to blow a large amount of hot air. However, in order to dry surely, it is necessary to keep the processing speed of the porous nickel foam 22 low and dry it for a sufficient time. Thus, in the conventional manufacturing method, the drying process was rate-limiting, and the production efficiency of the porous nickel foam containing the active material was low.
Japanese Patent Laid-Open No. 2005-71788

以上のように、従来の製造方法では、乾燥工程がネックとなって、正極または負極となる多孔ニッケルフォームを効率的に製造することができなかった。   As described above, in the conventional manufacturing method, the drying step has become a bottleneck, and it has not been possible to efficiently manufacture the porous nickel foam that becomes the positive electrode or the negative electrode.

本発明は従来の技術の有するこのような問題点に鑑みてなされたものであって、その目的は、正極または負極となる活物質含有成形体を効率的に製造することができる方法を提供することにある。   The present invention has been made in view of such problems of the prior art, and an object of the present invention is to provide a method capable of efficiently producing an active material-containing molded body to be a positive electrode or a negative electrode. There is.

上記目的を達成するために本発明の活物質含有成形体の製造方法は、正極活物質または負極活物質を含有する溶融流動状態の熱可塑性樹脂に発泡状多孔体を浸漬し、次いで、その発泡状多孔体を冷却することを特徴としている。   In order to achieve the above object, the method for producing an active material-containing molded body according to the present invention comprises immersing a foamed porous body in a molten and flowing thermoplastic resin containing a positive electrode active material or a negative electrode active material, and then expanding the foamed body. The porous porous body is cooled.

また、発泡状多孔体としてニッケルフォームを用いることを特徴としている。   In addition, nickel foam is used as the foamed porous body.

基本的な電池構成は、正極集電体と、電解質溶液を有する正極側セルと、セパレータと、電解質溶液を有する負極側セルと、負極集電体とをこの順序で配置したものであり、正極側セル内に本発明の方法で製造した正極活物質含有成形体を配し、負極側セル内に本発明の方法で製造した負極活物質含有成形体を配することによって、次に説明するように充電または放電を行うことができる。   The basic battery configuration is such that a positive electrode current collector, a positive electrode side cell having an electrolyte solution, a separator, a negative electrode side cell having an electrolyte solution, and a negative electrode current collector are arranged in this order. The positive electrode active material-containing molded body produced by the method of the present invention is arranged in the side cell, and the negative electrode active material-containing molded body produced by the method of the present invention is arranged in the negative electrode side cell, as described below. Can be charged or discharged.

例えば、充電時には、電池が発電手段と接続されると、発電手段から負極集電体を通して負極側に電子が供給され、負極活物質が電子を受容することによって発生した陰イオンはセパレータを通過して正極活物質と反応して電子を放出する。この電子は正極集電体に移動して発電手段に供給される。   For example, at the time of charging, when the battery is connected to the power generation means, electrons are supplied from the power generation means to the negative electrode side through the negative electrode current collector, and the negative ions generated when the negative electrode active material accepts the electrons pass through the separator. Reacts with the positive electrode active material to emit electrons. The electrons move to the positive electrode current collector and are supplied to the power generation means.

一方、放電時には、電池が負荷手段と接続されると、負荷手段から正極集電体を通して正極側に電子が供給され、正極活物質が電子を受容することによって発生した陰イオンはセパレータを通過して負極活物質と反応して電子を放出する。この電子は負極集電体に移動して負荷手段に供給される。   On the other hand, at the time of discharging, when the battery is connected to the load means, electrons are supplied from the load means to the positive electrode side through the positive electrode current collector, and the negative ions generated when the positive electrode active material accepts the electrons pass through the separator. Reacts with the negative electrode active material to emit electrons. The electrons move to the negative electrode current collector and are supplied to the load means.

本発明によれば、発泡状多孔体を溶融流動状態の熱可塑性樹脂に浸漬させる方式であるから、水分を蒸発・除去するために大量の熱風を吹きつける乾燥工程は必要なく、発泡状多孔体を放冷するか、発泡状多孔体に冷風を吹きつけるか、または発泡状多孔体と低温物質（例えば、水冷ロール）とを接触させることにより少しだけ温度を低下させるだけで溶融流動状態の熱可塑性樹脂の粘度を上昇させて固化し、ベト付き感をなくすことができる。しかも、熱可塑性樹脂は弾性を有するので、活物質を保護する被覆材としての機能も果たし、衝撃と剥離に強い活物質含有成形体を得ることができる。   According to the present invention, since the foamed porous body is immersed in a melt-flowing thermoplastic resin, there is no need for a drying process in which a large amount of hot air is blown to evaporate and remove moisture. Heat in a melt-flow state with a slight decrease in temperature by allowing the foam to cool, blowing cold air to the foam porous body, or bringing the foam porous body into contact with a low-temperature substance (for example, a water-cooled roll). The viscosity of the plastic resin can be increased and solidified to eliminate the sticky feeling. In addition, since the thermoplastic resin has elasticity, it also functions as a covering material for protecting the active material, and an active material-containing molded body that is strong against impact and peeling can be obtained.

このようにして、大量の乾燥熱源により十分に時間をかけて乾燥する必要はなく、冷却媒体との短時間の接触により溶融流動状態の熱可塑性樹脂を固化し、効率的に活物質含有成形体を製造することができる。   In this way, it is not necessary to dry a sufficient amount of time with a large amount of drying heat source, and the thermoplastic resin in the melt-flow state is solidified by short-time contact with the cooling medium to efficiently form an active material-containing molded body. Can be manufactured.

発泡状多孔体がニッケルフォームであれば、適切な巻戻機に巻き付けた多孔ニッケルフォームを連続的に巻き戻して、その多孔ニッケルフォームを活物質を含有する溶融流動状態の熱可塑性樹脂に浸漬した後に冷却し、次いで、適切な巻取機でその多孔ニッケルフォームを連続的に巻き取ることにより、活物質含有多孔ニッケルフォームを効率的に得ることができる。   If the foamed porous body is nickel foam, the porous nickel foam wound around an appropriate unwinding machine is continuously unwound and the porous nickel foam is immersed in a melt-flowing thermoplastic resin containing an active material. The active material-containing porous nickel foam can be efficiently obtained by subsequently cooling and then continuously winding the porous nickel foam with a suitable winder.

以下に本発明の実施形態について説明するが、本発明は下記実施形態に限定されるものではなく、本発明の技術的範囲を逸脱しない範囲において適宜変更して実施することが可能である。   Embodiments of the present invention will be described below, but the present invention is not limited to the following embodiments, and can be appropriately modified and implemented without departing from the technical scope of the present invention.

まず、上記した方法により多孔ニッケルフォームを製造し、この多孔ニッケルフォームに以下に説明するような方法で活物質を含浸させる。言うまでもないことであるが、ニッケルフォーム以外の発泡状多孔体を用いることもできる。また、発泡状多孔体に代えて、ポリプロピレン繊維、ポリエステル繊維、ポリアミド繊維など化学繊維の不織布や羊毛、綿など天然繊維の不織布を用いることもできる。これら不織布を後記する図１の装置において、多孔ニッケルフォームに代えて用いることにより、正極活物質を含有する不織布を得ることもできる。   First, a porous nickel foam is produced by the above-described method, and this porous nickel foam is impregnated with an active material by the method described below. Needless to say, a foamed porous body other than nickel foam can also be used. In place of the foamed porous material, a non-woven fabric of chemical fibers such as polypropylene fiber, polyester fiber or polyamide fiber, or a non-woven fabric of natural fibers such as wool or cotton can be used. The nonwoven fabric containing a positive electrode active material can also be obtained by using these nonwoven fabrics instead of the porous nickel foam in the apparatus shown in FIG.

図１は、本発明の活物質含有成形体を製造するに好適の装置の一例の概略構成図である。図１において、巻戻機１に巻き付けたロール状の多孔ニッケルフォーム２を巻き戻して、ガイドロール３、４を経て活物質を含有する溶融流動状態の熱可塑性樹脂を満たした活物質含浸槽５に導入する。活物質含浸槽５には、熱可塑性樹脂（エチレン酢酸ビニルコポリマー、ＥＶＡ）を適切な溶剤に溶解させてなる溶媒に正極活物質としての水酸化ニッケル粉末を含有するものを約８０℃に加熱することによって得られたスラリー６が満たされている。なお、溶剤は必要に応じて使用されるものであり、溶剤を使用せずに熱可塑性樹脂を加温するだけで溶融流動状態にしたものに活物質を含ませることもできる。   FIG. 1 is a schematic configuration diagram of an example of an apparatus suitable for producing the active material-containing molded body of the present invention. In FIG. 1, a roll-shaped porous nickel foam 2 wound around a rewinding machine 1 is unwound and an active material impregnation tank 5 filled with a melt-flowing thermoplastic resin containing an active material through guide rolls 3 and 4. To introduce. The active material impregnation tank 5 is heated to about 80 ° C. containing nickel hydroxide powder as a positive electrode active material in a solvent obtained by dissolving a thermoplastic resin (ethylene vinyl acetate copolymer, EVA) in an appropriate solvent. The slurry 6 obtained by this is filled. In addition, a solvent is used as needed, and an active material can also be included in what was made into the melt flow state only by heating a thermoplastic resin, without using a solvent.

熱可塑性樹脂の種類はＥＶＡに限定されるものではない。熱可塑性樹脂は軽くて強く、成形しやすく、水分やガスを通しにくく、腐食に強く、電気を通さないなどの特徴を有するが、本発明の方法で製造される活物質含有成形体はアルカリ性の電解質溶液（ＫＯＨ、ＮａＯＨ、ＬｉＯＨなど）に常時接触するという条件で使用されるので、熱可塑性樹脂としては耐化学薬品性に優れているものを使用することが好ましい。また、熱可塑性樹脂の有する高温で可逆的に軟化する特性は活物質担持媒体として好ましい特性であるが、耐熱性（融点）が高すぎるのは好ましくない。というのは、熱可塑性樹脂を溶融流動状態にするための温度が高くなりすぎ、その熱可塑性樹脂に含まれる活物質の中で、正極活物質は失活し、負極活物質は酸化して、ともに性能が劣化する恐れがあるからである。   The kind of thermoplastic resin is not limited to EVA. The thermoplastic resin is light and strong, easy to mold, has low moisture and gas permeability, is resistant to corrosion, and does not conduct electricity, but the active material-containing molded body produced by the method of the present invention is alkaline. Since it is used on condition that it is always in contact with an electrolyte solution (KOH, NaOH, LiOH, etc.), it is preferable to use a thermoplastic resin having excellent chemical resistance. Further, the property of the thermoplastic resin that reversibly softens at a high temperature is a preferable property for the active material-carrying medium, but it is not preferable that the heat resistance (melting point) is too high. This is because the temperature for bringing the thermoplastic resin into a melt-flow state becomes too high, and among the active materials contained in the thermoplastic resin, the positive electrode active material is deactivated, the negative electrode active material is oxidized, This is because the performance may deteriorate in both cases.

すなわち、本発明における熱可塑性樹脂に要求される特性の中で特に重要なものは、耐化学薬品性に優れていることと比較的融点が低いことである。この点で、ＥＶＡ以外にも、ポリエチレン、ポリ塩化ビニル、アイオノマー、ケトン樹脂、ポリエチレンオキサイド、ポリエチレンテレフタレートなどを好ましく用いることができる。   That is, particularly important properties required for the thermoplastic resin in the present invention are excellent chemical resistance and a relatively low melting point. In this respect, besides EVA, polyethylene, polyvinyl chloride, ionomer, ketone resin, polyethylene oxide, polyethylene terephthalate, and the like can be preferably used.

活物質含浸槽５内のガイドロール７と８を経た多孔ニッケルフォーム２に正極活物質含有スラリー６を含浸させた後、活物質含浸槽５から取り出された多孔ニッケルフォーム２はガイドロール９を経てファン１０ａと１０ｂから吹きつけられる冷風により、溶融流動状態を脱して固化し、ガイドロール１１を経て、上下２段の圧延ロール１２ａと１２ｂから構成される圧延機により圧延された後、巻取機１３に巻き付けられて、正極活物質を含有するロール状の多孔ニッケルフォーム１４を得ることができる。   After impregnating the porous nickel foam 2 passed through the guide rolls 7 and 8 in the active material impregnation tank 5 with the positive electrode active material-containing slurry 6, the porous nickel foam 2 taken out from the active material impregnation tank 5 passes through the guide roll 9. After being melted and solidified by cold air blown from the fans 10a and 10b, passed through the guide roll 11, and then rolled by a rolling mill composed of two upper and lower rolling rolls 12a and 12b, a winder 13 to obtain a rolled porous nickel foam 14 containing a positive electrode active material.

以上のように構成される装置を用いれば、巻戻機１に巻き付けたロール状の多孔ニッケルフォーム２を巻き戻して、水酸化ニッケル粉末を含有するスラリー６に浸漬し、次いで、その多孔ニッケルフォーム２をファン１０ａと１０ｂから吹きつけられる冷風で冷却することにより、厚みが薄くて熱容量の小さい多孔ニッケルフォーム２（約０．６５mmの厚さ）は瞬時に冷却されて溶融流動状態にある熱可塑性樹脂は固化するので、連続的且つ高速で巻き取ることが可能で、多数の気孔中に熱可塑性樹脂で被覆された水酸化ニッケル粉末を含有するロール状の多孔ニッケルフォーム１４を高い生産能率で得ることができる。その後、必要に応じて、その多孔ニッケルフォーム１４を真空下または減圧下で乾燥処理することにより、多孔ニッケルフォームに含まれる湿分をほぼ完全に除去することができる。   If the apparatus comprised as mentioned above is used, the roll-shaped porous nickel foam 2 wound around the unwinding machine 1 will be rewound and immersed in the slurry 6 containing nickel hydroxide powder, and then the porous nickel foam 2 is cooled by cold air blown from the fans 10a and 10b, so that the porous nickel foam 2 (thickness of about 0.65 mm) having a small thickness and a small heat capacity is instantaneously cooled to be in a molten and flowing state. Since the resin is solidified, it can be wound continuously and at a high speed, and a rolled porous nickel foam 14 containing nickel hydroxide powder coated with a thermoplastic resin in a large number of pores is obtained with high production efficiency. be able to. Thereafter, if necessary, the moisture contained in the porous nickel foam can be almost completely removed by drying the porous nickel foam 14 under vacuum or reduced pressure.

熱可塑性樹脂の種類によっては、ファン１０ａと１０ｂから吹き付けられる冷風による冷却手段に代えて、ファン１０ａと１０ｂを省略して活物質含浸槽５から取り出された多孔ニッケルフォーム２に何も外的処理を施さず、放冷により多孔ニッケルフォームを冷却する手段を採用することができる。さらに、ガイドロール９と１１の内部に冷却水を通入し、その水冷ロールと多孔ニッケルフォームを接触させることにより多孔ニッケルフォームを冷却する手段を採用することもできる。   Depending on the type of thermoplastic resin, no external treatment is performed on the porous nickel foam 2 taken out from the active material impregnation tank 5 by omitting the fans 10a and 10b instead of the cooling means by the cold air blown from the fans 10a and 10b. A means for cooling the porous nickel foam by cooling can be employed. Furthermore, a means for cooling the porous nickel foam by introducing cooling water into the guide rolls 9 and 11 and bringing the water-cooled roll into contact with the porous nickel foam may be employed.

このように、本発明の方法は、多孔ニッケルフォームを活物質を含有する水溶液に浸漬する方式ではなく、活物質を含有する溶融流動状態の熱可塑性樹脂に多孔ニッケルフォームを浸漬する方式であるから、乾燥のために大量の熱源を用いて十分に時間をかけて乾燥する必要はなく、溶融流動状態にある熱可塑性樹脂を固化するためにその多孔ニッケルフォームの温度を少しだけ低下させればよいから、処理速度を上げることができ、全体として製造コストを大きく低減することができる。   Thus, the method of the present invention is not a method of immersing the porous nickel foam in an aqueous solution containing an active material, but a method of immersing the porous nickel foam in a melt-flowing thermoplastic resin containing an active material. It is not necessary to dry a large amount of time using a large amount of heat source for drying, and the temperature of the porous nickel foam only needs to be lowered slightly in order to solidify the thermoplastic resin in the melt flow state. Therefore, the processing speed can be increased and the manufacturing cost can be greatly reduced as a whole.

負極活物質を含有する多孔ニッケルフォームを製造する場合は、上記において、正極活物質に代えて負極活物質（例えば、水素吸蔵合金粉末）を用いればよい。   When producing a porous nickel foam containing a negative electrode active material, a negative electrode active material (for example, a hydrogen storage alloy powder) may be used in place of the positive electrode active material in the above.

本発明の方法で製造された活物質含有成形体は、工具、玩具、電灯、カメラ、ラジオ、パソコン、ビデオ、携帯電話などの電源として利用することができる電池の正極または負極として好適に用いることができる。  The active material-containing molded body produced by the method of the present invention is preferably used as a positive electrode or a negative electrode of a battery that can be used as a power source for tools, toys, electric lamps, cameras, radios, personal computers, videos, mobile phones and the like. Can do.

本発明の活物質含有成形体の製造に適した装置の一例の概略構成図である。It is a schematic block diagram of an example of the apparatus suitable for manufacture of the active material containing molded object of this invention. 従来の活物質含有成形体の製造に使用される装置の一例の概略構成図である。It is a schematic block diagram of an example of the apparatus used for manufacture of the conventional active material containing molded object.

符号の説明Explanation of symbols

１ 巻戻機
２ 多孔ニッケルフォーム
３ ガイドロール
４ ガイドロール
５ 活物質含浸槽
６ スラリー
７ ガイドロール
８ ガイドロール
９ ガイドロール
１０ａ ファン
１０ｂ ファン
１１ ガイドロール
１２ａ 圧延ロール
１２ｂ 圧延ロール
１３ 巻取機
１４ 多孔ニッケルフォーム DESCRIPTION OF SYMBOLS 1 Rewinder 2 Porous nickel foam 3 Guide roll 4 Guide roll 5 Active material impregnation tank 6 Slurry 7 Guide roll 8 Guide roll 9 Guide roll 10a Fan 10b Fan 11 Guide roll 12a Roll roll 12b Roll roll 13 Winder 14 Porous nickel The form

Claims (2)

正極活物質または負極活物質を含有する溶融流動状態の熱可塑性樹脂に発泡状多孔体を浸漬し、次いで、その発泡状多孔体を冷却することを特徴とする活物質含有成形体の製造方法。   A method for producing an active material-containing molded article, comprising immersing a foamed porous body in a melt-flowing thermoplastic resin containing a positive electrode active material or a negative electrode active material, and then cooling the foamed porous body. 発泡状多孔体がニッケルフォームからなる請求項１記載の活物質含有成形体の製造方法。


The method for producing an active material-containing molded body according to claim 1, wherein the foamed porous body is made of nickel foam.


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