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1. WO2022205667 - SILICON-BASED NEGATIVE ELECTRODE MATERIAL, AND PREPARATION METHOD THEREFOR AND APPLICATION THEREOF

Publication Number WO/2022/205667
Publication Date 06.10.2022
International Application No. PCT/CN2021/105915
International Filing Date 13.07.2021
IPC
H01M 4/62 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
62Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
H01M 4/48 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
48of inorganic oxides or hydroxides
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 2004/021
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
021Physical characteristics, e.g. porosity, surface area
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 4/483
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
483for non-aqueous cells
H01M 4/625
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
625Carbon or graphite
H01M 4/628
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
628Inhibitors, e.g. gassing inhibitors, corrosion inhibitors
Applicants
  • 万向一二三股份公司 WANXIANG A123 SYSTEMS ASIA CO., LTD. [CN]/[CN]
  • 万向集团公司 WANXIANG GROUP [CN]/[CN]
Inventors
  • 张小祝 ZHANG, Xiaozhu
  • 苏敏 SU, Min
  • 陈云 CHEN, Yun
  • 许梦清 XU, Mengqing
Agents
  • 杭州杭诚专利事务所有限公司 HANGZHOU HANGCHENG PATENT ATTORNEY OFFICE CO., LTD.
Priority Data
202110340775.330.03.2021CN
Publication Language Chinese (zh)
Filing Language Chinese (ZH)
Designated States
Title
(EN) SILICON-BASED NEGATIVE ELECTRODE MATERIAL, AND PREPARATION METHOD THEREFOR AND APPLICATION THEREOF
(FR) MATÉRIAU D'ÉLECTRODE NÉGATIVE À BASE DE SILICIUM, SON PROCÉDÉ DE PRÉPARATION ET SON APPLICATION
(ZH) 一种硅基负极材料及其制备方法、应用
Abstract
(EN) The present invention relates to the technical field of lithium ion batteries, and in particular to a silicon-based negative electrode material, and a preparation method therefor and the application thereof. The silicon-based negative electrode material comprises a SiOx inner core, a carbon middle layer and an AlPO4 cladding layer which are sequentially arranged from inside to outside. The silicon-based negative electrode material of the present invention is of a three-layer core-shell structure. A carbon middle layer plays a role in isolating an electrolyte, relieving the volume expansion and improving the electrical conductivity of the material; an AlPO4 cladding layer on a surface of the carbon middle layer further isolates the contact between the electrolyte and SiOx and a carbon layer, thereby eradicating the occurrence of a side reaction and reducing the continuous formation of an SEI film; and at the same time, the AlPO4 cladding layer can serve as the SEI film, thereby increasing the migration rate of Li+ and improving the thermal stability of the material. A lithium ion battery made of the silicon-based negative electrode material of the present invention has excellent high-temperature performance characteristics of a high capacity, a long cycle life, a high-temperature cycle performance, a high-temperature storage performance, etc., and also has wide application prospects.
(FR) La présente invention concerne le domaine technique des batteries au lithium-ion, et en particulier un matériau d'électrode négative à base de silicium, ainsi que son procédé de préparation et son application. Le matériau d'électrode négative à base de silicium comprend un noyau interne de SiOx, une couche centrale de carbone et une couche de gainage d'AlPO4 qui sont agencés de manière séquentielle de l'intérieur vers l'extérieur. Le matériau d'électrode négative à base de silicium de la présente invention est une structure cœur-écorce à trois couches. Une couche intermédiaire de carbone joue un rôle dans l'isolation d'un électrolyte, en soulageant l'expansion de volume et en améliorant la conductivité électrique du matériau; une couche de gainage d'AlPO4 sur une surface de la couche centrale de carbone isole davantage le contact entre l'électrolyte et le SiOx et une couche de carbone, ce qui permet d'éliminer l'apparition d'une réaction secondaire et de réduire la formation continue d'un film SEI; et en même temps, la couche de gainage d'AlPO4 peut servir de film SEI, ce qui permet d'augmenter le taux de migration de Li+ et d'améliorer la stabilité thermique du matériau. Une batterie au lithium-ion constituée du matériau d'électrode négative à base de silicium de la présente invention a d'excellentes caractéristiques de performance à haute température pour une capacité élevée, une longue durée de vie, une performance de cycle à haute température, une performance de stockage à haute température, etc., et présente également de larges perspectives d'application.
(ZH) 本发明涉及锂离子电池技术领域,尤其涉及一种硅基负极材料及其制备方法、应用,所述硅基负极材料包括从内到外依次设置的SiO x内核、碳中间层和AlPO 4包覆层。本发明的硅基负极材料为三层核壳结构,碳中间层起到隔绝电解液、缓解体积膨胀、提升材料导电性的作用;碳中间层表面的AlPO 4包覆层进一步隔绝电解液和SiO x及碳层的接触,杜绝副反应的发生,减少SEI膜的持续形成,同时AlPO 4包覆层可以充当SEI膜,提高Li +的迁移速率,改善材料的热稳定性。采用本发明的硅基负极材料制得的锂离子电池具有高容量、长循环寿命、高温循环和高温存储性能等优越的高温性能的特点,具有广阔的应用前景。
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