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1. WO2022041831 - SILICON OXIDE COMPOSITE MATERIAL, NEGATIVE ELECTRODE MATERIAL, NEGATIVE ELECTRODE AND LITHIUM ION BATTERY, AND PREPARATION METHOD THEREFOR

Publication Number WO/2022/041831
Publication Date 03.03.2022
International Application No. PCT/CN2021/092174
International Filing Date 07.05.2021
IPC
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
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
B82Y 30/00
BPERFORMING OPERATIONS; TRANSPORTING
82NANOTECHNOLOGY
YSPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
30Nanotechnology for materials or surface science, e.g. nanocomposites
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 4/36
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 4/366
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 4/38
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
Applicants
  • 贝特瑞新材料集团股份有限公司 BTR NEW MATERIAL GROUP CO., LTD. [CN]/[CN]
  • 惠州市鼎元新能源科技有限公司 DINGYUAN NEW ENERGY TECHNOLOGY CO., LTD. [CN]/[CN]
Inventors
  • 屈丽娟 QU, Lijuan
  • 庞春雷 PANG, Chunlei
  • 邓志强 DENG, Zhiqiang
  • 任建国 REN, Jianguo
  • 贺雪琴 HE, Xueqin
Agents
  • 北京超凡宏宇专利代理事务所(特殊普通合伙) CHOFN INTELLECTUAL PROPERTY
Priority Data
202010898585.931.08.2020CN
Publication Language Chinese (zh)
Filing Language Chinese (ZH)
Designated States
Title
(EN) SILICON OXIDE COMPOSITE MATERIAL, NEGATIVE ELECTRODE MATERIAL, NEGATIVE ELECTRODE AND LITHIUM ION BATTERY, AND PREPARATION METHOD THEREFOR
(FR) MATÉRIAU COMPOSITE D'OXYDE DE SILICIUM, MATÉRIAU D'ÉLECTRODE NÉGATIVE, ÉLECTRODE NÉGATIVE ET BATTERIE LITHIUM-ION, ET LEURS PROCÉDÉS DE PRÉPARATION
(ZH) 硅氧复合材料、负极材料、负极和锂离子电池及其制备方法
Abstract
(EN) The present invention relates to a silicon oxide composite material, a negative electrode material, a negative electrode and a lithium ion battery, and a preparation method therefor. The silicon oxide composite material comprises an inner core and a carbon layer formed on the surface of the inner core; the inner core comprises a lithium-containing compound and a non-metallic silicon-containing material; the non-metallic silicon-containing material comprises at least one of nano silicon and silicon oxide; the non-metallic silicon-containing material is dispersed in the lithium-containing compound; the size D10 of the silicon oxide composite material is 3.0-8.2 µm. In the present invention, by controlling the particle size D10 of the silicon oxide composite material to be between 3.0-8.2 µm, on one hand, pre-lithium uniformity can be improved, no nano silicon is exposed on a particle surface, and expected first effect improvement and good cycle stability are obtained, and on the other hand, appropriate electron and ion conduction paths are comprised, the internal resistance of a particle is small, and the rate performance and cycle performance of the material are improved. Moreover, the prepared negative electrode and lithium ion battery have higher first-time coulombic efficiency and excellent cycle performance.
(FR) La présente invention concerne un matériau composite d'oxyde de silicium, un matériau d'électrode négative, une électrode négative et une batterie au lithium-ion, et un procédé de préparation associé. Le matériau composite d'oxyde de silicium comprend un noyau interne et une couche de carbone formée sur la surface du noyau interne. Le noyau interne comprend un composé contenant du lithium et un matériau contenant du silicium non métallique. Le matériau contenant du silicium non métallique comprend au moins l'un parmi le silicium nanométrique et l'oxyde de silicium. Le matériau contenant du silicium non métallique est dispersé dans le composé contenant du lithium. La taille D10 du matériau composite d'oxyde de silicium va de 3,0 à 8,2 µm. Dans la présente invention, en régulant la granulométrie D10 du matériau composite d'oxyde de silicium pour qu'elle soit comprise entre 3,0 et 8,2 µm, d'une part, une uniformité de pré-lithium peut être améliorée, aucun nano-silicium n'est exposé sur une surface de particule et une amélioration attendue de premier effet ainsi qu'une bonne stabilité de cycle sont obtenues et, d'autre part, des trajets de conduction d'électrons et d'ions appropriés sont compris, la résistance interne d'une particule est faible et les performances de vitesse et les performances de cycle du matériau sont améliorées. De plus, l'électrode négative et la batterie lithium-ion préparées présentent un rendement coulombien de premier temps plus élevé et d'excellentes performances de cycle.
(ZH) 本公开涉及一种硅氧复合材料、负极材料、负极和锂离子电池及其制备方法。所述硅氧复合材料包括内核和形成于所述内核表面的碳层,所述内核包括含锂化合物和非金属含硅材料,所述非金属含硅材料包括纳米硅及硅氧化物中的至少一种,所述非金属含硅材料分散于所述含锂化合物中;所述硅氧复合材料的尺寸D10为3.0μm~8.2μm。本公开通过将硅氧复合材料的粒径D10控制在3.0μm~8.2μm之间,一方面可以提升预锂均匀性,没有纳米硅暴露在颗粒表面,获得预期的首效提升及良好的循环稳定性能;另一方面具有合适的电子、离子传导路径,颗粒内部阻抗小,提升材料的倍率性能和循环性能。同时所制备的负极和锂离子电池具有较高的首次库伦效率以及优异的循环性能。
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