KR20080021945A - Electrode for battery and rechargeable battery using the same - Google Patents

Electrode for battery and rechargeable battery using the same Download PDF

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Publication number
KR20080021945A
KR20080021945A KR1020060085199A KR20060085199A KR20080021945A KR 20080021945 A KR20080021945 A KR 20080021945A KR 1020060085199 A KR1020060085199 A KR 1020060085199A KR 20060085199 A KR20060085199 A KR 20060085199A KR 20080021945 A KR20080021945 A KR 20080021945A
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South Korea
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active material
electrode
current collector
battery
material layer
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KR1020060085199A
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Korean (ko)
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이대회
김형식
정동호
김택
우승완
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삼성에스디아이 주식회사
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Priority to KR1020060085199A priority Critical patent/KR20080021945A/en
Publication of KR20080021945A publication Critical patent/KR20080021945A/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/362—Composites
    • H01M4/366—Composites as layered products
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/131—Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
    • 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

Abstract

An electrode for a battery is provided to improve a charge and discharge efficiency of a battery because an active material is uniformly distributed in an active material layer. An electrode to be applied to a positive electrode or negative electrode of a battery includes: a current collector(15) formed of conductive foil; and an active material layer(17) comprising plural layers(16) laminated on the current collector. The plural layers have a same component. The plural layers are arranged in a direction perpendicular to the surface of the current collector. The active material layer has an interface in which adjacent layers touch each other.

Description

전지용 전극과 이를 이용한 이차 전지{ELECTRODE FOR BATTERY AND RECHARGEABLE BATTERY USING THE SAME}Electrode for battery and secondary battery using the same {ELECTRODE FOR BATTERY AND RECHARGEABLE BATTERY USING THE SAME}

도 1는 본 발명의 일 실시예에 따른 전지용 전극의 평면도이다.1 is a plan view of a battery electrode according to an embodiment of the present invention.

도 2는 도 1에서 Ⅱ-Ⅱ선을 따라 잘라 본 단면도이다.FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1.

본 발명은 전지용 전극에 관한 것으로서, 더욱 상세하게는 이차 전지에 사용되는 활물질층의 구조를 개선한 전지용 전극에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery electrode, and more particularly to a battery electrode having an improved structure of an active material layer used for a secondary battery.

전자 기기 등의 전원으로 사용되는 이차 전지는 양극과 음극이 세퍼레이터(separator)를 사이에 두고 위치하는 전극군을 구비한다.A secondary battery used as a power source for an electronic device or the like includes an electrode group in which a positive electrode and a negative electrode are positioned with a separator interposed therebetween.

양극 및 음극은 금속으로 이루어진 집전체에 활물질이 도포된 구조로 이루어진다. 통상적으로 음극(anode)은 구리 또는 알루미늄 등으로 이루어진 집전체에 탄소계 활물질이 도포된 구조로 이루어진다. 양극(cathode)은 알루미늄 등으로 이루어진 집전체에 LiCoO2, LiMnO2, LiNiO2 등으로 이루어진 활물질이 도포된 구조로 이루어진다. The positive electrode and the negative electrode have a structure in which an active material is applied to a current collector made of metal. Typically, the anode has a structure in which a carbon-based active material is coated on a current collector made of copper or aluminum. The cathode has a structure in which an active material made of LiCoO 2 , LiMnO 2 , LiNiO 2, or the like is applied to a current collector made of aluminum or the like.

이러한 활물질은 집전체에 용이하게 도포될 수 있도록 도전제, 바인더, 용매 등의 물질과 함께 슬러리의 형태로 집전체에 도포된다.The active material is applied to the current collector in the form of a slurry together with a material such as a conductive agent, a binder, a solvent, and the like so that the active material can be easily applied to the current collector.

활물질 슬러리가 도포된 집전체는 건조로에서 건조과정을 거치게 된다. 집전체가 건조로로 유입되면 활물질에 포함된 NMP(N-메틸피롤리돈; N-methylpyrrolidone) 등의 용매는 휘발된다.The current collector coated with the active material slurry is dried in a drying furnace. When the current collector is introduced into the drying furnace, a solvent such as NMP (N-methylpyrrolidone) contained in the active material is volatilized.

이 과정에서 도전제, 바인더 등에 비하여 상대적으로 무게가 큰 활물질 덩어리는 집전체 쪽으로 이동하여, 집전체에 인접하는 부분의 활물질 밀도가 집전체에서 먼 부분의 활물질 밀도보다 크게 된다.In this process, the mass of the active material, which is relatively heavier than the conductive agent, the binder, or the like moves to the current collector, so that the active material density of the portion adjacent to the current collector is larger than the active material density of the portion far from the current collector.

이와 같이 활물질층 내에서 활물질의 밀도가 불균일하게 되면, 충전과 방전 효율이 저하되어 전지의 출력이 감소하는 문제가 발생한다.As such, when the density of the active material is uneven in the active material layer, the charge and discharge efficiency is lowered, thereby causing a problem in that the output of the battery is reduced.

이에 본 발명은 상기한 문제를 해결하기 위해 안출된 것으로서, 본 발명의 목적은 밀도가 균일한 활물질층을 갖는 이차 전지를 제공함에 있다. Accordingly, the present invention has been made to solve the above problems, an object of the present invention to provide a secondary battery having a uniform active material layer.

상기의 목적을 달성하기 위하여 본 발명의 실시예에 따른 전지용 전극은 도전성 박판으로 이루어진 집전체와 상기 집전체 상에 형성되며 복수의 층들로 이루어진 활물질층을 포함한다.In order to achieve the above object, a battery electrode according to an embodiment of the present invention includes a current collector made of a conductive thin plate and an active material layer formed on the current collector and composed of a plurality of layers.

상기 활물질층은 2개 또는 3개의 층들로 이루어질 수 있다.The active material layer may consist of two or three layers.

상기 활물질층은 집전체의 양쪽 면에 각각 복수의 층들로 형성될 수 있다.The active material layer may be formed of a plurality of layers on each side of the current collector.

상기 활물질층을 이루는 복수의 층들은 동일한 성분으로 이루어질 수 있다.The plurality of layers constituting the active material layer may be made of the same component.

상기 복수의 층들은 집전체의 표면에 수직인 방향으로 적층 배열될 수 있다.The plurality of layers may be stacked in a direction perpendicular to the surface of the current collector.

상기 활물질층은 인접하는 층들이 맞닿는 경계면을 가질 수 있다.The active material layer may have an interface where adjacent layers abut.

상기 경계면은 집전체와 나란하게 배치될 수 있다.The interface may be arranged in parallel with the current collector.

상기한 전극을 포함하는 이차 전지는 양극과 음극을 포함하는 전극, 상기 양극과 상기 음극 사이에 개재되는 세퍼레이터, 상기 전극과 상기 세퍼레이터가 삽입되는 케이스와 상기 케이스에 결합되어 케이스를 밀폐하며 전극 단자가 설치된 캡 조립체를 포함할 수 있다. 이와 같이 본 발명에 따른 전극이 적용되는 이차 전지는 통상적으로 사용되는 이차 전지이며 특정한 구조의 이차 전지로 한정되는 것은 아니다.The secondary battery including the electrode includes an electrode including a positive electrode and a negative electrode, a separator interposed between the positive electrode and the negative electrode, a case into which the electrode and the separator are inserted, and the case are combined to seal the case and the electrode terminal It may include an installed cap assembly. As described above, the secondary battery to which the electrode according to the present invention is applied is a secondary battery commonly used and is not limited to a secondary battery having a specific structure.

이하, 첨부한 도면을 참조로 본 발명의 실시예에 대해 당업자가 용이하게 실시할 수 있도록 상세히 설명한다. 그러나, 본 발명은 여러가지 상이한 형태로 구현될 수 있으며 여기에서 설명하는 실시예에 한정되는 것은 아니다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

도 1은 본 발명의 일 실시예에 따른 전지용 전극을 도시한 사시도이다.1 is a perspective view showing a battery electrode according to an embodiment of the present invention.

상기한 도면을 참조하면, 본 실시예에 따른 전지용 전극(10)은 이차 전지의 양극 또는 음극에 적용되는 전극으로서, 도전성 박판으로 이루어진 집전체(15) 상에 활물질층(17)이 형성된 코팅부(12)와, 이 코팅부(12)와 인접하게 배치되며 활물질층(17)이 형성되지 않아 집전체(15)가 노출된 무지부(11)를 포함한다.Referring to the drawings, the battery electrode 10 according to the present embodiment is an electrode applied to the positive electrode or the negative electrode of the secondary battery, the coating portion in which the active material layer 17 is formed on the current collector 15 made of a conductive thin plate (12) and the non-coated portion 11 disposed adjacent to the coating portion 12 and in which the active material layer 17 is not formed and the current collector 15 is exposed.

양극 집전체는 알루미늄 등으로 이루어지며, 음극 집전체는 구리 또는 알루미늄 등으로 이루어진다.The positive electrode current collector is made of aluminum or the like, and the negative electrode current collector is made of copper or aluminum.

한편, 양극 활물질층은 LiCoO2, LiMnO2, LiNiO2 등으로 이루어진 활물질과 도전제, 바인더 등으로 이루어지며, 음극 활물질층은 흑연 등의 탄소계 활물질과 도전제, 바인더 등으로 이루어진다.On the other hand, the positive electrode active material layer is composed of an active material consisting of LiCoO 2 , LiMnO 2 , LiNiO 2 and the like, a conductive agent, a binder, and the like, the negative electrode active material layer is composed of a carbon-based active material such as graphite, a conductive agent, a binder and the like.

집전체(15)는 일 측 방향(도면의 Y축 방향)으로 길게 이어진 띠 형상으로 이루어지며, 무지부(11)는 이러한 집전체(15)의 길이 방향으로 일측 단부를 따라 이어져 형성된다.The current collector 15 is formed in a band shape extending in one side direction (Y-axis direction in the drawing), and the plain portion 11 is formed along one end portion in the longitudinal direction of the current collector 15.

도 2에 도시된 바와 같이, 본 실시예에 따른 전극(10)은 집전체(15)의 양면에 활물질층(17)이 형성되며 양면의 활물질층(17)은 각각 복수 개의 층들(16)로 이루어진다. 따라서 활물질층(17)은 복수의 층들(16)이 맞닿는 경계면(19)을 가지며, 이러한 경계면(19)은 집전체(15)와 나란하게 배치된다.As shown in FIG. 2, the electrode 10 according to the present embodiment has an active material layer 17 formed on both surfaces of the current collector 15, and the active material layers 17 on both sides are formed of a plurality of layers 16, respectively. Is done. Accordingly, the active material layer 17 has an interface 19 on which the plurality of layers 16 abut, and the interface 19 is disposed in parallel with the current collector 15.

본 실시예에서는 활물질층(17)이 세 개의 층(16)으로 이루어진 구조를 예시하고 있으나, 본 발명이 이에 제한되는 것은 아니며 활물질층(17)은 두 개 또는 세 개의 층으로 형성될 수 있다.In this embodiment, the active material layer 17 illustrates a structure composed of three layers 16, but the present invention is not limited thereto, and the active material layer 17 may be formed of two or three layers.

활물질층(17)을 이루는 복수의 층들(16)은 집전체(15)의 표면에 수직인 방향으로 적층 배열되며, 각 층들(16)은 동일한 성분의 활물질(21)과 도전제, 바인더 등의 기타 성분(25)를 포함하고 있다.The plurality of layers 16 constituting the active material layer 17 are stacked in a direction perpendicular to the surface of the current collector 15, and each of the layers 16 may be formed of an active material 21 having the same component, a conductive agent, a binder, or the like. Other components 25 are included.

이와 같이 활물질층(17)이 복수 개의 층들(16)로 이루어지면, 활물질층(17)에 포함된 활물질(21)이 집전체(15)의 표면에 수직한 방향(도면의 Z축 방향)으로 균일한 밀도를 갖는다.When the active material layer 17 is composed of the plurality of layers 16 as described above, the active material 21 included in the active material layer 17 is perpendicular to the surface of the current collector 15 (the Z-axis direction in the drawing). Have a uniform density.

즉, 활물질층이 하나의 층으로 이루어질 경우에는 활물질층을 건조하는 과정에서 덩어리로 이루어진 활물질들이 아래로 이동하고, 위에는 도전제와 바인더 등의 기타 성분만 남게 되어 활물질층 내부에 활물질들이 불균일하게 분포하게 된다.That is, when the active material layer is composed of one layer, the active material consisting of agglomerates moves downward in the process of drying the active material layer, and only the other components such as a conductive agent and a binder remain on the active material, resulting in uneven distribution of the active material inside the active material layer Done.

그러나 본 실시예와 같이 활물질층(17)이 복수의 얇은 층들로 이루어지면, 활물질들(21)이 경계면에서 이동하지 못하므로 각 층에서 활물질들(21)이 도전제와 바인더 등의 기타 성분(25)과 섞여서 고르게 분포한다. 이에 의하면 짧은 시간 동안 보다 많은 활물질(21)이 전해액(미도시)과 반응할 수 있어서, 이차 전지의 충전과 방전 효율이 향상된다.However, if the active material layer 17 is composed of a plurality of thin layers as in the present embodiment, the active materials 21 do not move at the interface, so that the active materials 21 in each layer may contain other components such as a conductive agent and a binder ( 25), evenly distributed. According to this, more active materials 21 can react with an electrolyte (not shown) for a short time, thereby improving the charging and discharging efficiency of the secondary battery.

상기한 전극이 적용되는 이차 전지는 양극과 음극을 포함하는 전극, 양극과 음극 사이에 개재되는 세퍼레이터, 전극과 세퍼레이터가 삽입되는 케이스와 상기 케이스에 결합되어 케이스를 밀폐하며 전극 단자가 구비된 캡 조립체를 포함한다. 이와 같이 본 발명에 따른 전극이 적용되는 이차 전지는 통상적으로 사용되는 이차 전지로서 이러한 이차전지의 구성은 당업자에게 널리 알려져 있으므로 이에 대한 자세한 설명은 생략한다.The secondary battery to which the electrode is applied includes an electrode including a positive electrode and a negative electrode, a separator interposed between the positive electrode and the negative electrode, a case into which the electrode and the separator are inserted, and a cap assembly coupled to the case to seal the case and having electrode terminals. It includes. As described above, the secondary battery to which the electrode according to the present invention is applied is a secondary battery that is commonly used, and thus the construction of the secondary battery is well known to those skilled in the art, and thus a detailed description thereof will be omitted.

상기에서는 본 발명의 바람직한 실시예에 대하여 설명하였지만, 본 발명은 이에 한정되는 것은 아니며 특허청구범위와 발명의 상세한 설명 및 첨부한 도면의 범위 안에서 여러 가지로 변형하여 실시하는 것이 가능하고 이 또한 본 발명의 범위에 속하는 것은 당연하다.In the above description of the preferred embodiment of the present invention, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it belongs to the range of.

이와 같이 본 발명에 따르면, 활물질층 내에 활물질이 균일한 밀도로 분포할 수 있어서 전지의 충전과 방전 효율이 향상된다.As described above, according to the present invention, the active material can be distributed in a uniform density in the active material layer, thereby improving the charging and discharging efficiency of the battery.

Claims (8)

전지의 양극 또는 음극에 적용되는 전극에 있어서,In the electrode applied to the positive or negative electrode of the battery, 도전성 박판으로 이루어진 집전체와A current collector made of a conductive thin plate 상기 집전체 상에 겹쳐져 형성되는 복수의 층들로 이루어진 활물질층을 포함하는 전지용 전극.A battery electrode comprising an active material layer consisting of a plurality of layers formed on the current collector overlapping. 제1 항에 있어서,According to claim 1, 상기 활물질층은 2개 또는 3개의 층으로 이루어지는 전지용 전극.The active material layer is a battery electrode consisting of two or three layers. 제1 항에 있어서,According to claim 1, 상기 활물질층은 상기 집전체의 양쪽 면에 각각 복수의 층들로 형성되는 전지용 전극.The active material layer is a battery electrode formed of a plurality of layers on each side of the current collector. 제1 항에 있어서,According to claim 1, 상기 복수의 층들은 동일한 성분을 갖는 전지용 전극.And the plurality of layers have the same component. 제1 항에 있어서,According to claim 1, 상기 복수의 층들은 집전체의 표면에 수직인 방향으로 적층 배열되는 전극.And the plurality of layers are stacked in a direction perpendicular to the surface of the current collector. 제1 항에 있어서,According to claim 1, 상기 활물질층은 인접하는 층들이 맞닿는 경계면을 갖는 전지용 전극.The active material layer is a battery electrode having an interface where the adjacent layers abut. 제6 항에 있어서,The method of claim 6, 상기 경계면은 집전체와 나란하게 배치되는 전지용 전극.The boundary surface is a battery electrode disposed parallel to the current collector. 제1 항 내지 제7 항 중 어느 한 항의 전극을 포함하는 이차 전지.A secondary battery comprising the electrode of any one of claims 1 to 7.
KR1020060085199A 2006-09-05 2006-09-05 Electrode for battery and rechargeable battery using the same KR20080021945A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150024268A1 (en) * 2012-02-23 2015-01-22 E I Du Pont De Nemours And Company Hydrocarbon ionomer compositions, layerings, electrodes, methods for making and methods for using
WO2016013862A1 (en) * 2014-07-22 2016-01-28 주식회사 이엠따블유에너지 Micro-battery, and pcb and semiconductor chip using same
WO2016148383A1 (en) * 2015-03-17 2016-09-22 주식회사 엘지화학 Electrode with multilayer structure and lithium secondary battery having same
CN110767872A (en) * 2019-10-30 2020-02-07 桑德新能源技术开发有限公司 Silicon-carbon negative plate, preparation method thereof and battery

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150024268A1 (en) * 2012-02-23 2015-01-22 E I Du Pont De Nemours And Company Hydrocarbon ionomer compositions, layerings, electrodes, methods for making and methods for using
WO2016013862A1 (en) * 2014-07-22 2016-01-28 주식회사 이엠따블유에너지 Micro-battery, and pcb and semiconductor chip using same
EP3179549A4 (en) * 2014-07-22 2017-06-14 Rekrix Co., Ltd. Micro-battery, and pcb and semiconductor chip using same
EP3182498A4 (en) * 2014-07-22 2018-02-21 Rekrix Co., Ltd. Silicon secondary battery
US10418661B2 (en) 2014-07-22 2019-09-17 Rekrix Co., Ltd. Micro-battery, and PCB and semiconductor chip using same
WO2016148383A1 (en) * 2015-03-17 2016-09-22 주식회사 엘지화학 Electrode with multilayer structure and lithium secondary battery having same
CN110767872A (en) * 2019-10-30 2020-02-07 桑德新能源技术开发有限公司 Silicon-carbon negative plate, preparation method thereof and battery

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