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1. WO2021114436 - NEGATIVE ELECTRODE, ELECTROCHEMICAL DEVICE COMPRISING NEGATIVE ELECTRODE, AND ELECTRONIC DEVICE

Publication Number WO/2021/114436
Publication Date 17.06.2021
International Application No. PCT/CN2019/130465
International Filing Date 31.12.2019
IPC
H01M 4/13 2010.1
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
13Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
H01M 4/36 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
36Selection of substances as active materials, active masses, active liquids
H01M 4/583 2010.1
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
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 4/38 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
36Selection of substances as active materials, active masses, active liquids
38of elements or alloys
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 2004/027
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
026characterised by the polarity
027Negative electrodes
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
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
48of inorganic oxides or hydroxides
Applicants
  • 宁德新能源科技有限公司 NINGDE AMPEREX TECHNOLOGY LIMITED [CN]/[CN]
Inventors
  • 易婷 YI, Ting
  • 崔航 CUI, Hang
  • 谢远森 XIE, Yuansen
Agents
  • 北京律盟知识产权代理有限责任公司 LEE AND LI - LEAVEN IPR AGENCY LTD.
Priority Data
201911267132.X11.12.2019CN
Publication Language Chinese (zh)
Filing Language Chinese (ZH)
Designated States
Title
(EN) NEGATIVE ELECTRODE, ELECTROCHEMICAL DEVICE COMPRISING NEGATIVE ELECTRODE, AND ELECTRONIC DEVICE
(FR) ÉLECTRODE NÉGATIVE, DISPOSITIF ÉLECTROCHIMIQUE COMPRENANT CELUI-CI ET DISPOSITIF ÉLECTRONIQUE
(ZH) 负极和包含所述负极的电化学装置及电子装置
Abstract
(EN) Provided are a negative electrode (10), an electrochemical device comprising the negative electrode (10), and an electronic device. The negative electrode (10) comprises: a negative electrode current collector (101), first negative electrode active material layers (102), and second negative electrode active material layers (103). The first negative electrode active material layers (102) are single-sidedly provided at first parts of the negative electrode current collector (101); the second negative electrode active material layers (103) are double-sidedly provided at a second part of the negative electrode current collector (101) that is different from the first parts; the ratio of the unit surface area weight of the first negative electrode active material layers (102) to that of the second negative electrode active material layers (103) on the negative electrode current collector (101) is 0.47 to 0.52; and the ratio of the compaction density of the first negative electrode active material layers (102) to that of the second negative electrode active material layers (103) is 0.9 to 1.1. By employing the described negative electrode (10), the polarization and lithium precipitation of an electrochemical device may be improved from the negative electrode structure direction, thereby improving the cyclic performance and safety performance of the electrochemical device.
(FR) Électrode négative (10), dispositif électrochimique comprenant l'électrode négative (10), et dispositif électronique. L'électrode négative (10) comprend : un collecteur de courant d'électrode négative (101), des premières couches de matériau actif d'électrode négative (102) et des secondes couches de matériau actif d'électrode négative (103). Les premières couches de matériau actif d'électrode négative (102) sont disposées d'un seul côté au niveau de premières parties du collecteur de courant d'électrode négative (101) ; les secondes couches de matériau actif d'électrode négative (103) sont disposées d'un seul côté au niveau d'une seconde partie du collecteur de courant d'électrode négative (101) qui est différente des premières parties ; le rapport du poids de surface unitaire des premières couches de matériau actif d'électrode négative (102) sur celui des secondes couches de matériau actif d'électrode négative (103) sur le collecteur de courant d'électrode négative (101) est de 0,47 à 0,52 ; et le rapport de la densité de compactage des premières couches de matériau actif d'électrode négative (102) sur celui des secondes couches de matériau actif d'électrode négative (103) est de 0,9 à 1,1. En utilisant l'électrode négative (10) décrite, la polarisation et la précipitation de lithium d'un dispositif électrochimique peuvent être améliorées à partir de la direction de la structure d'électrode négative, ce qui permet d'améliorer les performances cycliques et les performances de sécurité du dispositif électrochimique.
(ZH) 提供一种负极(10)及包含所述负极(10)的电化学装置及电子装置。所述负极(10)包括:负极集流体(101)、第一负极活性材料层(102)以及第二负极活性材料层(103)。所述第一负极活性材料层(102)单面设置在所述负极集流体(101)的第一部分,且所述第二负极活性材料层(103)双面设置在所述负极集流体(101)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(102)与所述第二负极活性材料层(103)在所述负极集流体(101)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(102)与所述第二负极活性材料层(103)的压实密度的比值为0.9至1.1。通过采用上述负极(10)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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