Title:
POSITIVE ELECTRODE ACTIVE MATERIAL AND PREPARATION METHOD THEREFOR, POSITIVE ELECTRODE SHEET, SECONDARY BATTERY, BATTERY MODULE, BATTERY PACK AND ELECTRICAL DEVICE
Document Type and Number:
WIPO Patent Application WO/2023/240613
Kind Code:
A1
Abstract:
The present application provides a positive electrode active material, a preparation method therefor, a positive electrode sheet, a secondary battery, a battery module, a battery pack and an electrical device. The positive electrode active material comprises a core containing Li1+xMn1-yAyP1-zRzO4; a first coating layer covering the core and containing crystalline pyrophosphate LiaMP2O7 and/or Mb(P2O7)c; a second coating layer covering the first coating layer and containing a crystalline oxide M'dOe; and a carbon-containing third coating layer covering the second coating layer. According to the positive electrode active material of the present application, the generation of Li/Mn antisite defects can be reduced, manganese dissolution is reduced, and the lattice change rate is reduced, so that the capacity of the secondary battery is improved, and the cycle performance, the high-temperature storage performance and the safety performance of the secondary battery are improved.
Inventors:
JIANG YAO (CN)
ZHANG XINXIN (CN)
OUYANG CHUYING (CN)
XU BO (CN)
DENG BIN (CN)
YUAN TIANCI (CN)
WANG ZHIQIANG (CN)
CHEN SHANGDONG (CN)
ZHANG XINXIN (CN)
OUYANG CHUYING (CN)
XU BO (CN)
DENG BIN (CN)
YUAN TIANCI (CN)
WANG ZHIQIANG (CN)
CHEN SHANGDONG (CN)
Application Number:
PCT/CN2022/099516
Publication Date:
December 21, 2023
Filing Date:
June 17, 2022
Export Citation:
Assignee:
CONTEMPORARY AMPEREX TECHNOLOGY CO LTD (CN)
International Classes:
H01M4/36
Foreign References:
| CN114256448A | 2022-03-29 | |||
| CN104577115A | 2015-04-29 | |||
| CN110854360A | 2020-02-28 | |||
| CN102931404A | 2013-02-13 | |||
| CN106816600A | 2017-06-09 | |||
| US20190020015A1 | 2019-01-17 | |||
| GB245332009TA |
Attorney, Agent or Firm:
CCPIT PATENT AND TRADEMARK LAW OFFICE (CN)
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