Title:
SECONDARY BATTERY
Document Type and Number:
WIPO Patent Application WO/2020/078357
Kind Code:
A1
Abstract:
The present invention provides a secondary battery, comprising a positive electrode tab, a negative electrode tab, electrolyte and a separation film, wherein the positive electrode tab comprises a positive electrode current collector, and a positive electrode film disposed on at least one surface of the positive electrode current collector, and comprising an active substance of the positive electrode, the negative electrode tab comprises a negative electrode current collector, and a negative electrode film disposed on at least one surface of the negative electrode current collector, and comprising an active substance of the negative electrode. The secondary battery also satisfies 1.0 ≤ CB/[(D99 negative-D90 negative)/D50 negative] ≤ 4.0. In the present invention, the relationship between a cell balance coefficient and a particle size distribution in an active substance of a negative electrode is coordinated to obtain a secondary battery having a long cycle life, high energy density, and fast charging capability.
Inventors:
WANG JIAZHENG (CN)
SHEN YULIANG (CN)
KANG MENG (CN)
HE LIBING (CN)
SHEN YULIANG (CN)
KANG MENG (CN)
HE LIBING (CN)
Application Number:
PCT/CN2019/111330
Publication Date:
April 23, 2020
Filing Date:
October 15, 2019
Export Citation:
Assignee:
CONTEMPORARY AMPEREX TECHNOLOGY CO LTD (CN)
International Classes:
H01M10/0525; H01M4/36; H01M4/38; H01M4/66; H01M10/054
Foreign References:
| CN109449446A | 2019-03-08 | |||
| CN205692907U | 2016-11-16 | |||
| CN205692907U | 2016-11-16 | |||
| CN101207190A | 2008-06-25 | |||
| CN107223288A | 2017-09-29 | |||
| JP2015135800A | 2015-07-27 |
Attorney, Agent or Firm:
BEIJING WUZHOUYANGHE & PARTNERS (CN)
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