KR20180137798A - A electrode coating device having a coating die for making uncoated potion on an electrode, and a method for making an electrode thereby, and an electrode made therefrom - Google Patents
A electrode coating device having a coating die for making uncoated potion on an electrode, and a method for making an electrode thereby, and an electrode made therefrom Download PDFInfo
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- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
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- B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
- B05B1/02—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape
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- B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
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- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/26—Processes for applying liquids or other fluent materials performed by applying the liquid or other fluent material from an outlet device in contact with, or almost in contact with, the surface
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- H01M10/00—Secondary cells; Manufacture thereof
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Abstract
본 발명에 따라 토출구의 일부가 막힌 전극 코팅 다이를 연속 또는 불연속 구동하여 전극 표면에 다양한 형상의 미코팅부를 형성시킴으로써, 간편한 공정을 통해 리튬이온전지에서 전극 안쪽으로 전해액 공급이 잘 될 수 있는 전해액 통로를 제공함으로써 전해액의 함침성이 개선되어 전해액 함침 시간을 단축할 수 있고, 탈기(degassing) 공정에서 전해액 분출을 방지하여 공정성이 크게 개선된다. 또한 전해액을 담지할 수 있는 공간을 제공하여 전지의 수명을 개선할 수 있다.According to the present invention, an electrode coating die having a part of a discharge port is continuously or discontinuously driven to form uncoated portions of various shapes on the surface of an electrode, whereby an electrolytic solution passage The impregnation property of the electrolyte solution is improved to shorten the impregnation time of the electrolyte solution and prevent the electrolyte solution from being spouted in the degassing process. Further, it is possible to improve the service life of the battery by providing a space in which the electrolyte can be carried.
Description
본 발명은 전극 코팅 다이에 관한 것으로서, 보다 구체적으로는 미코팅부가 형성된 전극을 제조하기 위한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrode coating die, and more particularly, to an electrode having an uncoated portion.
근래에는 노트북, 카메라, 핸드폰 등과 같은 휴대용 전자 기기들의 보급 확대로 재충전이 가능하고 소형 및 대용량화가 가능한 이차전지의 수요량이 급증하고 있으며, 이에 따라 이차전지의 성능이 점차 개선되어 대량 생산되고 있다.2. Description of the Related Art [0002] In recent years, demand for a rechargeable secondary battery which can be recharged by increasing the spread of portable electronic devices such as a notebook computer, a camera, and a mobile phone has been rapidly increasing.
대표적으로는 니켈수소(Ni-MH) 전지와 리튬 이차 전지가 사용되고 있다. 이 중에서 차세대 동력원으로 주목받는 리튬 이차 전지는 에너지 밀도가 높고 기억 효과가 없으며, 사용하지 않을 때에도 자연방전이 일어나는 정도가 작고, 매우 가벼워 널리 사용되고 있다. 이 외에도 에너지밀도가 높은 특성을 이용하여 방위산업이나 자동화시스템, 그리고 자동차, 항공산업 분야에서도 점점 그 사용 빈도가 증가하는 추세이며, 특히 전기 자동차 및 하이브리드 자동차의 모터 구동원으로 널리 상용되고 있다.Typically, a nickel-hydrogen (Ni-MH) battery and a lithium secondary battery are used. Of these, lithium secondary batteries, which are attracting attention as a next generation power source, have a high energy density, no memory effect, and a low degree of natural discharge even when not in use. In addition, the frequency of use is gradually increasing in the fields of defense industry, automation system, automobile and aviation industry using high energy density characteristics, and it is widely used as a motor driving source of electric vehicles and hybrid vehicles.
이러한 리튬 이차 전지는 일반적으로는, 전해액(electrolytic solution)의 종류에 따라 액체 전해질을 사용하는 리튬 이온 전지와, 고분자 전해질을 사용하는 리튬 폴리머 전지로 분류될 수 있다. 또한, 이러한 이차 전지는 여러 가지 형상으로 제조되고 있으며, 크게 원통형, 각형(prismatic), 파우치형으로 분류될 수 있다.Such a lithium secondary battery generally can be classified into a lithium ion battery using a liquid electrolyte according to the type of an electrolytic solution and a lithium polymer battery using a polymer electrolyte. In addition, such a secondary battery is manufactured in various shapes and can be roughly divided into a cylindrical shape, a prismatic shape, and a pouch shape.
또한, 통상적으로 리튬 이차 전지는 집전체에 양극 활물질이 코팅된 양극판, 집전체에 음극 활물질이 코팅된 음극판, 및 이 양극판과 음극판 사이에 배치되어 리튬 이온의 이동만을 가능하게 하면서 쇼트는 방지하는 분리막으로 구성되는 전극 조립체; 이 전극 조립체를 수용하는 케이스; 이 케이스 내측에 수용되어 리튬 이온의 이동을 가능하게 하는 전해액 등으로 구성된다.In addition, a lithium secondary battery typically includes a positive electrode plate on which a positive electrode active material is coated on a current collector, a negative electrode plate on which a negative electrode active material is coated on the current collector, and a separator which is disposed between the positive electrode plate and the negative electrode plate, An electrode assembly comprising: A case for accommodating the electrode assembly; And an electrolytic solution accommodated inside the case to enable movement of lithium ions.
한편, 전극 조립체는, 긴 시트형의 양극판과 음극판을 분리막이 개재된 상태에서 권취한 구조의 권취형 전극조립체, 소정 크기의 단위로 절취한 다수의 양극판과 음극판을 분리막을 개재한 상태로 순차적으로 적층한 적층형 전극조립체, 및 소정 단위의 양극판과 음극판을 분리막을 개재한 상태로 적층한 바이셀(Bi-cell) 또는 풀셀(Full cell)들을 긴 길이의 연속적인 분리막 시트를 이용하여 일 방향으로 또는 지그재그 방향으로 폴딩한 구조의 스택/폴딩형 전극조립체로 분류될 수 있다. 이와 같은 전지부는 젤리(Jelly)를 와인딩한 형상과 유사하여 일반적으로 젤리-롤(Jelly Roll)이라 불린다.On the other hand, the electrode assembly includes a wound electrode assembly having a structure in which a long sheet-like positive electrode plate and a negative electrode plate are wound with a separator interposed therebetween, a plurality of positive electrode plates and negative electrode plates cut in a predetermined size unit, A stacked electrode assembly and a bi-cell or full cell stacked with a separator interposed between a positive electrode plate and a negative electrode plate of a predetermined unit are stacked in a single direction or in a zigzag manner using a continuous separator sheet, Stacked / folded electrode assemblies having a structure folded in the direction of arrows. Such a battery part is similar to a shape in which a jelly is wound, and is generally called a jelly roll.
이렇게 제조된 젤리-롤은, 일정 크기 및 모양의 캔(can) 혹은 파우치(pouch) 등의 전지케이스에 삽입한 후, 최종적으로 전해액을 주입함으로써 이루어진다.The thus-prepared jelly-roll is inserted into a battery case such as a can having a predetermined size and shape, or a pouch, and then finally injected with an electrolytic solution.
이때, 나중에 주입된 전해액은 모세관 힘(capillary force)에 의해 양극, 음극 및 분리막 사이로 스며들게 되며, 이러한 전해액은 이온의 이동을 위한 매개체로서의 역할을 수행하는 것이다.At this time, the electrolyte injected later is impregnated into the space between the anode, the cathode and the separator by a capillary force, and this electrolyte plays a role as an agent for the movement of ions.
소형 대용량 전지의 요구에 따라 전지의 에너지 밀도가 높아짐에 따라 전극이 고밀도로 제조되어야 하고, 이는 전해액 함침이 어렵고, 전해액의 주액량이 한정되게 되어 전지의 수명과 저장 특성 등 전지의 장기 신뢰성 확보에 어려움을 초래하고 있다.As the energy density of a battery becomes higher according to the demand of a small-sized large-capacity battery, the electrode has to be manufactured at a high density, and it is difficult to impregnate the electrolyte, and the amount of the main liquid of the electrolyte is limited, thereby securing the long- Causing difficulties.
그러나, 이차전지 생산 과정에 있어서, 전해액의 함침량은 제한적일 수 밖에 없고, 전해액을 주입하고 이것이 전극 및 분리막에 잘 함침되도록 하는 데에는 결코 적지 않은 시간이 소요되며, 까다로운 공정 조건이 요구된다.However, in the process of producing the secondary battery, the impregnation amount of the electrolyte is inevitably limited, and it takes a considerable time to inject the electrolyte and impregnate the electrode and the separator with each other, and a demanding process condition is required.
이러한 문제를 해결하기 위해 활물질 코팅이 완료된 전극층에 후속하여 레이저 패턴을 형성하는 기술이 아래 특허문헌 1에 개시되어 있다.In order to solve such a problem, a technique for forming a laser pattern subsequently to an electrode layer having completed coating of an active material is disclosed in Patent Document 1 below.
그러나, 특허문헌 1의 기술은, 이미 제조된 전극층을 후속 가공 공정으로 패턴을 형성하기 때문에, 공정이 복잡해지고, 설비비가 크게 증가하며, 활물질 손실이 발생하고, 활물질 등의 불순물 입자가 존재하여, 추후 전지의 안정성에 불리한 영향을 미칠 수 있다.However, the technique of Patent Document 1 is complicated because the process is complicated, the equipment cost is greatly increased, the active material loss occurs, the impurity particles such as the active material are present, Which may adversely affect the stability of the battery in the future.
본 발명은 상기 문제점을 고려하여 창안된 것으로서, 전해액의 젖음성을 향상시켜 전지의 성능을 향상시킬 수 있으며, 제조공정이 단순한 이차전지용 전극 및 그 제조방법을 제공하는 것이다.SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide an electrode for a secondary battery which can improve the wettability of an electrolyte solution to improve the performance of the battery and simplify the manufacturing process.
다만, 본 발명이 이루고자 하는 기술적 과제는 상술한 과제에 제한되지 않으며, 언급되지 않은 또 다른 과제들은 아래에 기재된 발명의 설명으로부터 당업자에게 명확하게 이해될 수 있을 것이다.It is to be understood, however, that the technical subject matter of the present invention is not limited to the above-mentioned problems, and other matters not mentioned can be clearly understood by those skilled in the art from the description of the invention described below.
본 발명은 전극 표면에 미코팅부가 형성되도록 토출구의 일부가 막힌 전극 코팅 다이를 구비하는 전극 코팅 장치를 제공하는 것이다.The present invention provides an electrode coating apparatus having an electrode coating die having a part of a discharge port clogged so as to form an uncoated portion on an electrode surface.
상기 토출구에는 차단부재가 설치되거나 토출구의 일부가 막힌 형상을 갖도록 함으로써 미코팅부가 형성되도록 할 수 있다.The discharge port may be provided with a blocking member or a part of the discharge port may have a clogged shape to form an uncoated portion.
또한, 본 발명은 토출구의 일부가 차단부재로 막힌 전극 코팅 다이를 연속 또는 불연속 구동하여 전극 표면에 미코팅부를 형성시키는 전극 코팅 방법을 제공하는 것이다.The present invention also provides an electrode coating method for forming an uncoated portion on an electrode surface by continuously or discontinuously driving an electrode coating die with a part of a discharge port clogged with a shielding member.
상기 본 발명에 따른 장치 및 방법에 있어서, 상기 전극 표면의 미코팅부가 하나 이상의 종선 형상, 하나 이상의 횡선 형상 및 하나 이상의 경사선 형상의 어느 하나 이상으로 형성될 수 있다.In the apparatus and method according to the present invention, the uncoated portion of the electrode surface may be formed of at least one of at least one of a vertical line shape, at least one horizontal line shape, and at least one slant line shape.
상기 본 발명에 따른 장치 및 방법에 있어서, 상기 전극은 음극 및 양극의 어느 하나 이상일 수 있다.In the apparatus and method according to the present invention, the electrode may be any one of a negative electrode and a positive electrode.
상기 본 발명에 따른 장치 및 방법에 있어서, 상기 음극 및 양극의 대면하는 부위에는 동일한 미코팅부를 형성하도록 구성될 수 있다. In the apparatus and method according to the present invention, the same uncoated portion may be formed on the facing portions of the cathode and the anode.
상기 본 발명에 따른 장치 및 방법에 있어서, 상기 음극의 미코팅부는 양극의 미코팅부 보다 좁게 형성되도록 구성되는 것이 바람직하다.In the apparatus and method according to the present invention, it is preferable that the uncoated portion of the negative electrode is formed to be narrower than the uncoated portion of the positive electrode.
상기 본 발명에 따른 장치 및 방법에 있어서, 상기 미코팅부의 폭이 3mm 이하인 것이 바람직하다.In the apparatus and method according to the present invention, the width of the uncoated portion is preferably 3 mm or less.
상기 본 발명에 따른 장치 또는 방법에 따라 표면에 미코팅부가 형성된 전극을 제공할 수 있다. 또한, 상기 미코팅부가 형성된 전극을 포함하는 이차전지가 특히 바람직하다.According to the apparatus or method according to the present invention, an electrode having an uncoated portion on the surface thereof can be provided. In addition, a secondary battery including the electrode having the uncoated portion is particularly preferable.
본 발명에 따르면, 간편한 공정을 통해 리튬이온전지에서 전극 안쪽으로 전해액 공급이 잘 될 수 있는 전해액 통로를 제공함으로써 전해액의 함침성이 개선되어 전해액 함침 시간을 단축할 수 있고, 탈기(degassing) 공정에서 전해액 분출을 방지하여 공정성이 크게 개선된다. 또한 전해액을 담지할 수 있는 공간을 제공하여 전지의 수명을 개선할 수 있다. According to the present invention, it is possible to improve the impregnating property of the electrolyte solution by providing the electrolyte solution passage through which the electrolyte solution can be supplied from the lithium ion battery to the inside of the electrode through a simple process, thereby shortening the electrolyte solution impregnation time, The ejection of the electrolyte solution is prevented and the processability is greatly improved. Further, it is possible to improve the service life of the battery by providing a space in which the electrolyte can be carried.
또한, 본 발명에 따라 음극에 양극과 대면하는 부위에 동일한 미코팅부를 형성하면 초기 충방전 효율의 감소를 보정할 수 있고, 이 때 음극 미코팅부가 양극 미코팅부보다 좁게 형성되면 양극과 음극의 불일치로 인한 리튬플레이팅(Li-plating)을 방지할 수 있다.In addition, if the same uncoated portion is formed on the cathode and the portion facing the anode according to the present invention, the decrease in the initial charging / discharging efficiency can be compensated. If the anode uncoated portion is narrower than the uncoated portion, It is possible to prevent lithium plating (Li-plating) due to mismatch.
도 1은 본 발명에 따른 차단부재를 포함하는 코팅 다이를 개략적으로 도시한 것이다.
도 2a는 본 발명에 따라 제조된 전극 표면 형상(종선 형상)의 일 구체예이다.
도 2b는 본 발명에 따라 제조된 전극 표면 형상(수평격자 형상)의 일 구체예이다.
도 2c는 본 발명에 따라 제조된 전극 표면 형상(경사선 형상)의 일 구체예이다.
도 2d는 본 발명에 따라 제조된 전극 표면 형상(경사격자 형상)의 일 구체예이다.
도 3은 종래 전지와 본 발명에 따른 전지의 수명을 비교한 그래프이다.1 schematically shows a coating die comprising a barrier member according to the invention.
2A is a specific example of the electrode surface shape (vertical line shape) manufactured according to the present invention.
FIG. 2B is a specific example of the electrode surface shape (horizontal grid shape) manufactured according to the present invention.
2C is a specific example of the electrode surface shape (slant line shape) produced according to the present invention.
2D is one specific example of the electrode surface shape (oblique lattice shape) manufactured according to the present invention.
3 is a graph comparing lifetimes of conventional batteries and batteries according to the present invention.
이하, 첨부된 도면을 참조하여 본 발명의 바람직한 실시 형태를 설명한다. 그러나, 본 발명의 실시 형태는 여러 가지 다른 형태로 변형될 수 있으며, 본 발명의 범위가 이하 설명하는 실시 형태로 한정되는 것은 아니다.Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. However, the embodiments of the present invention can be modified into various other forms, and the scope of the present invention is not limited to the embodiments described below.
본 실시예들을 설명함에 있어서, 동일 구성에 대해서는 동일 명칭 및 부호가 사용되며, 이에 따라 중복되는 부가적인 설명은 아래에서 생락된다. 아래에서 참조되는 도면들에서는 축적비가 적용되지 않는다.In describing the embodiments, the same designations and the same names are used, and thus overlapping additional descriptions are omitted below. In the drawings referred to below, the accumulation ratio is not applied.
본 발명의 일 구체예인 도 1은 전극 코팅 장치에서 코팅 다이를 포함한 일부를 도시한 것이다. 상기 도 1에 따르면, 전극 활물질은 코팅 다이(1)를 통해서 전극 집전체(2) 상에 도포된다. 이 경우 코팅 다이의 토출구에 차단부재(5)를 설치하거나 또는 다이를 동일한 형상으로 가공하면, 전극 집전체(2) 상에 활물질이 코팅된 코팅부(4)와 활물질이 코팅되지 않은 미코팅부(3)가 종선 형상으로 형성된다.1, which is an embodiment of the present invention, shows a part including a coating die in an electrode coating apparatus. 1, the electrode active material is coated on the electrode
상기 전극 코팅 장치 및 코팅 다이(1)는 통상 당업계에서 사용되는 것을 사용할 수 있으며, 특별히 제한되지 않는다.The electrode coating apparatus and the coating die (1) may be those conventionally used in the art, and are not particularly limited.
또한, 차단부재(5)의 형상은 토출구에 설치되어 활물질이 토출되는 경로를 차단함으로써 전극 표면에 적절한 폭의 미코팅부를 형성할 수 있으면 바람직하다. 또한, 설치되는 차단부재의 개수 또는 폭은 전극에 형성되는 미코팅부에 적합하게 구성될 수 있다. It is preferable that the shape of the blocking
또한, 상기 미코팅부를 형성하기 위해 토출구의 형상을 그에 맞게 제작할 수도 있다. 당업자로서는 본 발명의 사상을 구현하기 위해 기타 다른 수단을 적용할 수도 있을 것이며, 이들은 본 발명의 범주에 속하는 것이다.In order to form the uncoated portion, the shape of the discharge port may be modified. Those skilled in the art will appreciate that other means may be employed to implement the spirit of the invention, which are within the scope of the present invention.
상기 미코팅부가 형성되는 전극은 음극 및 양극의 어느 하나 이상일 수 있다. 이 경우, 전극 집전체(2)로는 전극이 양극인지 음극인지에 따라 서로 다른 금속재질이 적용될 수 있으며, 예를 들어, 전극이 양극인 경우 알루미늄 재질이, 음극인 경우 구리 재질이 사용될 수 있다.The electrode on which the uncoated portion is formed may be any one of a negative electrode and a positive electrode. In this case, the electrode
다만, 이러한 전극 집전체(1)의 재질은 예시적인 것일 뿐이므로 본 발명의 전극 집전체(1)의 재질이 이에 한정되는 것은 아니며, 이차전지 내에서 전기화학적 변화를 유발하지 않으면서 높은 도전성을 갖는 것이라면 특별히 제한되는 것은 아니다.However, since the material of the electrode current collector 1 is only an example, the material of the electrode current collector 1 of the present invention is not limited thereto, and the electrochemical change And is not particularly limited as long as it has high conductivity without inducing the conductivity.
상기 전극 활물질(2)은, 양극 활물질인 경우에는, 예를 들어, LiCoO2, LiMn2O4, LiNiO2, LiNiCoMnO2 등의 리튬계 산화물을 주성분으로 하는 화합물이 이용될 수 있고, 음극 활물질인 경우에는, 예를 들어, 탄소 계열 물질, Si, Sn, 틴 옥사이드, 틴 합금 복합체(composite tin alloys), 전이 금속 산화물 등이 이용될 수 있다.In the case of the positive electrode active material, the electrode active material (2) may be a compound containing a lithium-based oxide such as LiCoO 2 , LiMn 2 O 4 , LiNiO 2 , or LiNiCoMnO 2 as a main component. For example, carbon-based materials, Si, Sn, tin oxides, composite tin alloys, transition metal oxides, and the like can be used.
상기 코팅 장치에서 활물질을 공급을 연속하여 코팅 장치를 연속으로 구동하는 경우, 도 2a와 같은 연속된 종선 형상의 미코팅부(3)가 형성된다.When continuously supplying the active material to the coating apparatus and continuously driving the coating apparatus, continuous unevenly-coated
그러나, 상기 코팅 장치에서 활물질 공급을 일정 시간 중단하여 코팅 장치를 불연속으로 구동하는 경우에는, 도 2b와 같은 수평격자 형상의 미코팅부가 형성된다.However, when the coating apparatus is discontinuously driven by stopping the supply of the active material for a predetermined time, the uncoated portion having a horizontal lattice shape as shown in FIG. 2B is formed.
한편, 상기 코팅 장치에서 활물질 공급을 연속하여 코팅 장치를 연속으로 구동하면서, 코팅 다이(1) 또는 전극 집전체(2)를 수평으로 일정 속도로 이동시키면, 도 2c와 같은 경사선 형상의 미코팅부(3)를 형성할 수 있다.On the other hand, when the coating die 1 or the electrode
또한, 상기 경사선 형상의 미코팅부를 형성하는 중에, 활물질 공급을 일정 시간 중단하여 코팅 장치를 불연속 구동하는 경우에는, 도 2d와 같은 경사격자 형상의 미코팅부를 형성할 수 있다.In addition, when the coating material is discontinuously driven by stopping the supply of the active material during the formation of the sloped line-shaped uncoated portion, an uncoated portion having an oblique lattice shape as shown in FIG. 2D can be formed.
상기 예시적 설명에 따라, 상기 전극 표면의 미코팅부는 하나 이상의 종선 형상, 하나 이상의 횡선 형상 및 하나 이상의 경사선 형상의 어느 하나 이상으로 형성될 수 있다. 그러나, 당업자로서는 기타 다른 방법을 구성하여 이러한 형상의 미코팅부를 형성할 수 있을 것이며, 이러한 범주는 본 발명의 범위에 속하는 것이다.According to the illustrative description, the uncoated portion of the electrode surface may be formed of one or more of a vertical line shape, at least one horizontal line shape, and at least one slant line shape. However, those skilled in the art will be able to construct other methods to form uncoated portions of this shape, and such categories fall within the scope of the present invention.
상기 미코팅부의 개수나 간격은 당업자가 이차전지의 성능을 고려하여 적절히 선택할 수 있을 것이다.The number and spacing of the uncoated portions may be appropriately selected by those skilled in the art in consideration of the performance of the secondary battery.
그러나, 상기 미코팅부의 폭은 3mm 이하인 것이 바람직하다. 미코팅부의 폭이 3mm를 초과하는 경우에는 전해액의 함침은 용이하고 많은 양의 전해액을 담지할 수 있지만, 전극 활물질의 양의 감소에 따른 성능저하가 오히려 더 불리해진다.However, the width of the uncoated portion is preferably 3 mm or less. When the width of the uncoated portion exceeds 3 mm, impregnation of the electrolyte is easy and a large amount of electrolyte can be supported, but the deterioration in performance due to the reduction of the amount of the electrode active material is rather disadvantageous.
한편, 상기 본 발명에 따른 장치 및 방법에 따르면, 상기 음극 및 양극의 대면하는 부위에 동일한 미코팅부를 형성하도록 구성될 수 있다. 이러한 경우에는, 전해액 함침성이 보다 향상되며, 초기 충방전 효율의 감소를 보정할 수 있으므로, 보다 바람직하다.According to the apparatus and method of the present invention, the same uncoated portion may be formed on the facing portions of the cathode and the anode. In this case, the electrolyte impregnability is further improved, and the decrease in the initial charge / discharge efficiency can be corrected, which is more preferable.
나아가, 상기와 같이 음극 및 양극의 대면하는 부위에 미코팅부를 형성하는 경우에는, 상기 음극의 미코팅부가 양극의 미코팅부 보다 좁게 형성되도록 구성되는 것이 바람직하다. 음극 및 양극의 미코팅부가 정확히 일치하지 않는 경우, 특히 양극의 미코팅부가 오히려 좁은 경우에는 양극이 대응되는 음극이 없이 노출되게 됨으로써 리튬플레이팅을 초래하게 되므로 전지 성능 및 안전성에 부정적이다.Furthermore, when the uncoated portion is formed on the facing portion of the cathode and the anode as described above, it is preferable that the uncoated portion of the cathode is formed to be narrower than the uncoated portion of the anode. When the uncoated portions of the cathode and the anode are not exactly coincident with each other, particularly when the uncoated portion of the anode is rather narrow, the anode is exposed without a corresponding cathode, thereby causing lithium plating, which is a negative effect on battery performance and safety.
좀 더 부연하면, 상기 음극의 미코팅부가 양극보다 크게 형성되는 경우에는 충전 과정 동안 양극으로부터 나온 리튬이온을 받아 줄 수 있는 음극 활물질이 부족하여 음극의 미코팅부 모서리를 따라 리튬플레이팅이 발생하게 된다.More specifically, in the case where the uncoated portion of the negative electrode is formed to be larger than the positive electrode, lithium plating may occur along the uncoated portion edge of the negative electrode due to insufficient negative electrode active material capable of receiving lithium ions from the positive electrode during the charging process do.
상기 본 발명에 따른 장치 또는 방법에 따라 표면에 미코팅부가 형성된 전극을 포함하는 이차전지와, 미코팅부가 없는 종래 전극을 포함하는 이차전지를 비교 실험한 결과, 도 3에 도시된 바와 같이 전지 사이클 수가 증가함에 따라 현저히 개선된 수명을 나타내었다.As shown in FIG. 3, a secondary battery including an electrode having an uncoated portion formed on its surface according to the apparatus or method of the present invention and a conventional electrode including a conventional electrode without an uncoated portion, As the number increased, it showed a remarkably improved life span.
이상에서 본 발명의 실시예에 대하여 상세하게 설명하였지만 본 발명의 권리범위는 이에 한정되는 것은 아니고, 청구범위에 기재된 본 발명의 기술적 사상을 벗어나지 않는 범위 내에서 다양한 수정 및 변형이 가능하다는 것은 당 기술분야의 통상의 지식을 가진 자에게는 자명할 것이다.While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be obvious to those of ordinary skill in the art.
1 : 코팅 다이
2 : 전극 집전체
3 : 미코팅부
4 : 코팅부
5 : 차단부재1: coating die
2: electrode collector
3: Uncoated portion
4: Coating portion
5:
Claims (15)
And an electrode coating die having a part of the discharge port clogged so as to form an uncoated portion on the electrode surface.
The electrode coating apparatus according to claim 1, further comprising an electrode coating die having a shape in which a blocking member is provided at the discharge port or a part of the discharge port is clogged.
The electrode coating apparatus according to claim 1, wherein the uncoated portion of the electrode surface is at least one of at least one vertical line shape, at least one horizontal line shape, and at least one oblique line shape.
The electrode coating apparatus according to claim 1, wherein the electrode is at least one of a cathode and a cathode.
5. The electrode coating apparatus according to claim 4, wherein the same uncoated portion is formed on the facing portion of the cathode and the anode.
5. The electrode coating apparatus according to claim 4, wherein the uncoated portion of the negative electrode is formed to be narrower than the uncoated portion of the positive electrode.
The electrode coating apparatus according to claim 1, wherein the uncoated portion has a width of 3 mm or less.
Wherein an electrode coating die having a part of a discharge port is continuously or discontinuously driven to form an uncoated portion on an electrode surface.
The electrode coating method according to claim 8, wherein the electrode coating die is provided with a blocking member at the discharge port, or a part of the discharge port is clogged.
9. The electrode coating method according to claim 8, wherein the uncoated portion of the electrode surface is at least one of at least one vertical line shape, at least one horizontal line shape, and at least one oblique line shape.
The method of claim 8, wherein the electrode is at least one of a cathode and a cathode.
The electrode coating method according to claim 8, wherein the same uncoated portion is formed on the facing portion of the negative electrode and the positive electrode.
12. The electrode coating method according to claim 11, wherein the uncoated portion of the negative electrode is formed to be narrower than the uncoated portion of the positive electrode.
The electrode coating method according to claim 8, wherein the width of the uncoated portion is 3 mm or less.
15. A secondary battery comprising an electrode having an uncoated portion on a surface thereof according to the method of any one of claims 8 to 14.
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| KR102432246B1 (en) | 2021-11-05 | 2022-08-12 | (주)피엔티 | Method for coating electrode material of secondary battery electrode |
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