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1. WO2020134765 - NEGATIVE ELECTRODE PLATE FOR REDUCING IMPEDANCE OF LITHIUM ION BATTERY AND PREPARATION METHOD THEREFOR

Publication Number WO/2020/134765
Publication Date 02.07.2020
International Application No. PCT/CN2019/120268
International Filing Date 22.11.2019
IPC
H01M 4/66 2006.1
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
4Electrodes
02Electrodes composed of, or comprising, active material
64Carriers or collectors
66Selection of materials
H01M 10/0525 2010.1
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
10Secondary cells; Manufacture thereof
05Accumulators with non-aqueous electrolyte
052Li-accumulators
0525Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
CPC
H01M 10/0525
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
10Secondary cells; Manufacture thereof
05Accumulators with non-aqueous electrolyte
052Li-accumulators
0525Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
H01M 4/0404
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
4Electrodes
02Electrodes composed of or comprising active material
04Processes of manufacture in general
0402Methods of deposition of the material
0404by coating on electrode collectors
H01M 4/0471
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
4Electrodes
02Electrodes composed of or comprising active material
04Processes of manufacture in general
0471involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis
H01M 4/624
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
4Electrodes
02Electrodes composed of or comprising active material
62Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
624Electric conductive fillers
H01M 4/667
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
4Electrodes
02Electrodes composed of or comprising active material
64Carriers or collectors
66Selection of materials
665Composites
667in the form of layers, e.g. coatings
Y02E 60/10
YSECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
60Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
10Energy storage using batteries
Applicants
  • 珠海冠宇电池股份有限公司 ZHUHAI COSMX BATTERY CO., LTD. [CN]/[CN]
Inventors
  • 颜世银 YAN, Shiyin
  • 徐延铭 XU, Yanming
  • 李素丽 LI, Suli
  • 李俊义 LI, Junyi
Agents
  • 北京同立钧成知识产权代理有限公司 LEADER PATENT & TRADEMARK FIRM
Priority Data
201811582875.124.12.2018CN
Publication Language Chinese (ZH)
Filing Language Chinese (ZH)
Designated States
Title
(EN) NEGATIVE ELECTRODE PLATE FOR REDUCING IMPEDANCE OF LITHIUM ION BATTERY AND PREPARATION METHOD THEREFOR
(FR) PLAQUE D'ÉLECTRODE NÉGATIVE POUR RÉDUCTION D'IMPÉDANCE DE BATTERIE AU LITHIUM-ION ET SON PROCÉDÉ DE PRÉPARATION
(ZH) 一种降低锂离子电池阻抗的负极片及其制备方法
Abstract
(EN)
A negative electrode plate for reducing the impedance of a lithium ion battery and a preparation method therefor, relating to the field of lithium ion batteries. The negative electrode plate comprises a current collector, a conductive layer, and a negative electrode layer; both the conductive layer and the negative electrode layer comprise carboxymethyl cellulose lithium. The preparation method comprises the following steps: mixing carboxymethyl cellulose lithium, a conductive agent, a binder, and a solvent thoroughly to prepare uniform slurry; uniformly coating the surface of a current collector with conductive slurry, and drying the conductive slurry to obtain a conductive layer; and coating the surface of the conductive layer with negative electrode slurry containing the carboxymethyl cellulose lithium, and drying said slurry to obtain a negative electrode layer, thereby obtaining a negative electrode plate. According to the present application, adding a conductive layer between the negative electrode layer and the current collector achieves better conductivity while increasing the bonding force of pole pieces; in addition, adding the carboxymethyl cellulose lithium to the conductive layer and the negative electrode layer effectively improves the transmission efficiency of lithium, thereby greatly reducing the battery impedance, and improving the cycle and first formation efficiency.
(FR)
L'invention concerne une plaque d'électrode négative pour réduire l'impédance d'une batterie au lithium-ion et son procédé de préparation, se rapportant au domaine des batteries au lithium-ion. La plaque d'électrode négative comprend un collecteur de courant, une couche conductrice et une couche d'électrode négative ; à la fois la couche conductrice et la couche d'électrode négative comprennent du carboxyméthylcellulose de lithium. Le procédé de préparation comprend les étapes suivantes : le mélange de carboxyméthylcellulose de lithium, d'un agent conducteur, d'un liant et d'un solvant pour préparer une bouillie uniforme ; le revêtement uniforme de la surface d'un collecteur de courant avec une bouillie conductrice, et le séchage de la bouillie conductrice pour obtenir une couche conductrice ; et le revêtement de la surface de la couche conductrice avec une bouillie d'électrode négative contenant la carboxyméthylcellulose de lithium, et le séchage de ladite bouillie pour obtenir une couche d'électrode négative, ce qui permet d'obtenir une plaque d'électrode négative. Selon la présente invention, l'ajout d'une couche conductrice entre la couche d'électrode négative et le collecteur de courant permet d'obtenir une meilleure conductivité tout en augmentant la force de liaison de pièces polaires ; en outre, l'ajout du carboxyméthylcellulose de lithium à la couche conductrice et à la couche d'électrode négative améliore efficacement l'efficacité de transmission du lithium, ce qui permet de réduire considérablement l'impédance de la batterie, et d'améliorer le cycle et le premier rendement de formation.
(ZH)
一种降低锂离子电池阻抗的负极片及其制备方法,属于锂离子电池领域。所述负极片包括集流体,导电层,负极层,导电层和负极层中均含有羧甲基纤维素锂。制备方法包括如下步骤:将羧甲基纤维素锂,导电剂,粘结剂,溶剂充分搅拌配制成均匀浆料,将导电浆料均匀涂覆到集流体表面,烘干得到导电层。将含有羧甲基纤维素锂的负极浆料涂覆在导电层表面,烘干后得到负极层,即制得负极片。本申请通过在负极层与集流体之间加入一层导电层,在增加极片粘结力的同时,导电性更好,同时在导电层及负极层中加入羧甲基纤维素锂,有效提高锂的传输效率,从而极大降低了电池阻抗,并对循环和首次化成效率有一定的改善作用。
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