Title:
ELECTROLYTE COMPOSITION, METHOD FOR SECONDARY ELECTROLYTE FILLING, AND LITHIUM SECONDARY BATTERY
Document Type and Number:
WIPO Patent Application WO/2024/114190
Kind Code:
A1
Abstract:
The present application belongs to the technical field of lithium-ion batteries, and particularly relates to an electrolyte composition suitable for secondary electrolyte filling. The electrolyte composition comprises a first electrolyte and a second electrolyte, wherein the first electrolyte contains 1-2.5 wt% of vinylene carbonate, 0.1-3 wt% of lithium bis(fluorosulfonyl)imide, 5-15 wt% of lithium hexafluorophosphate, 0.01-5 wt% of a positive electrode film-forming additive, 0.01-5 wt% of a negative electrode film-forming additive, and 1-10 wt% of a fluorine-containing solvent, with the balance being a non-aqueous organic solvent. In the present application, by controlling the amounts of VC and LIFSI in the first filling, the additional filling of a fluorine-containing solvent and the addition of a positive electrode film-forming additive, the problems of an excessively high initial DCR, an excessively fast cyclic DCR growth speed, obvious long-cycle attenuation and diving can be avoided. Another core innovation point of the present application lies in that: low-concentration VC and a fluorine-containing solvent are used in the first filling to synergistically solve the problem of gas production, and by means of the cooperation between low-concentration LIFSI and low-concentration VC, the problem of excessively fast DCR attenuation caused by low-concentration VC is solved. In addition, further disclosed in the present application are a method for secondary liquid filling and a lithium secondary battery.
More Like This:
Inventors:
DING YOUTING (CN)
SUN WENPO (CN)
XIE TIAN (CN)
YU CHAOCHEN (CN)
LI SHUAILONG (CN)
ZHOU LI (CN)
SUN WENPO (CN)
XIE TIAN (CN)
YU CHAOCHEN (CN)
LI SHUAILONG (CN)
ZHOU LI (CN)
Application Number:
PCT/CN2023/126616
Publication Date:
June 06, 2024
Filing Date:
October 25, 2023
Export Citation:
Assignee:
JIUJIANG TINCI MATERIALS TECH CO LTD (CN)
International Classes:
H01M10/0525; H01M10/0566; H01M10/0567; H01M10/0569; H01M50/609
Foreign References:
| CN116315077A | 2023-06-23 | |||
| CN115732758A | 2023-03-03 | |||
| CN114069054A | 2022-02-18 | |||
| CN109065950A | 2018-12-21 | |||
| CN114335925A | 2022-04-12 | |||
| KR20160036810A | 2016-04-05 |
Other References:
LOGAN E. R., LOGAN E. R., ELDESOKY A., EASTWOOD E., HEBECKER H., AIKEN C. P., METZGER M., DAHN J. R.: "The Use of LiFSI and LiTFSI in LiFePO4/Graphite Pouch Cells to Improve High-Temperature Lifetime", JOURNAL OF THE ELECTROCHEMICAL SOCIETY, ELECTROCHEMICAL SOCIETY., vol. 169, no. 4, 1 January 2022 (2022-01-01), XP093177894, ISSN: 0013-4651, DOI: 10.1149/1945-7111/ac67f9
Attorney, Agent or Firm:
LEADER PATENT & TRADEMARK FIRM (CN)
Download PDF:
Previous Patent: POSITIONING METHOD AND COMMUNICATION APPARATUS
Next Patent: DATA PROCESSING METHOD AND APPARATUS
Next Patent: DATA PROCESSING METHOD AND APPARATUS