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1. CN111029527 - Negative electrode and electrochemical device including negative electrode and electronic device

Office
China
Application Number 201911267132.X
Application Date 11.12.2019
Publication Number 111029527
Publication Date 17.04.2020
Grant Number 111029527
Grant Date 11.06.2021
Publication Kind B
IPC
H01M 4/13
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
13Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
H01M 4/36
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
36Selection of substances as active materials, active masses, active liquids
H01M 4/38
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
36Selection of substances as active materials, active masses, active liquids
38of elements or alloys
H01M 4/48
HELECTRICITY
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MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
4Electrodes
02Electrodes composed of, or comprising, active material
36Selection of substances as active materials, active masses, active liquids
48of inorganic oxides or hydroxides
H01M 4/583
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
36Selection of substances as active materials, active masses, active liquids
58of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
583Carbonaceous material, e.g. graphite-intercalation compounds or CFx
H01M 4/62
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
CPC
H01M 4/13
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
13Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
H01M 4/366
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
36Selection of substances as active materials, active masses, active liquids
362Composites
366as layered products
H01M 4/386
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
36Selection of substances as active materials, active masses, active liquids
38of elements or alloys
386Silicon or alloys based on silicon
H01M 4/48
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MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
4Electrodes
02Electrodes composed of or comprising active material
36Selection of substances as active materials, active masses, active liquids
48of inorganic oxides or hydroxides
H01M 4/583
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
36Selection of substances as active materials, active masses, active liquids
58of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
583Carbonaceous material, e.g. graphite-intercalation compounds or CFx
H01M 4/622
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
621Binders
622being polymers
Applicants NINGDE AMPEREX TECHNOLOGY LTD.
宁德新能源科技有限公司
Inventors YI TING
易婷
CUI HANG
崔航
XIE YUANSEN
谢远森
Agents 北京律盟知识产权代理有限责任公司 11287
Title
(EN) Negative electrode and electrochemical device including negative electrode and electronic device
(ZH) 负极和包含所述负极的电化学装置及电子装置
Abstract
(EN) The invention relates to a negative electrode and an electrochemical device including the negative electrode and an electronic device. The negative electrode comprises a negative electrode current collector, a first negative electrode active material layer and a second negative electrode active material layer. The single surface of the first negative electrode active material layer is arranged atthe first part of the negative electrode current collector; the two surfaces of the second negative electrode active material layer are arranged at a second part, different from the first part, of thenegative electrode current collector, wherein the ratio of the unit area weight of the first negative electrode active material layer to the unit area weight of the second negative electrode active material layer on the negative electrode current collector is 0.47-0.52, and the ratio of the compaction density of the first negative electrode active material layer to the compaction density of the second negative electrode active material layer is 0.9-1.1. Polarization and lithium precipitation of the electrochemical device can be improved from the negative electrode structure direction by adopting the negative electrode so that the cycle performance and the safety performance of the electrochemical device are improved.
(ZH) 本申请涉及负极及包含所述负极的电化学装置及电子装置。所述负极包括:负极集流体、第一负极活性材料层以及第二负极活性材料层。所述第一负极活性材料层单面设置在所述负极集流体的第一部分,且所述第二负极活性材料层双面设置在所述负极集流体的不同于所述第一部分的第二部分,其中所述第一负极活性材料层与所述第二负极活性材料层在所述负极集流体上的单位面积重量的比值为0.47至0.52,且所述第一负极活性材料层与所述第二负极活性材料层的压实密度的比值为0.9至1.1。通过采用上述负极能够从负极结构方向改善电化学装置的极化和析锂,从而提升电化学装置的循环性能和安全性能。
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