Title:
LOW TEMPERATURE-TYPE LITHIUM-ION BATTERY ELECTROLYTE SOLUTION AND PREPARATION METHOD THEREFOR, AND LITHIUM-ION BATTERY
Document Type and Number:
WIPO Patent Application WO/2024/040826
Kind Code:
A1
Abstract:
The present invention relates to the technical field of lithium-ion batteries, and in particular relates to a low temperature-type lithium-ion battery electrolyte solution and a preparation method therefor, and a lithium-ion battery. The low temperature-type lithium-ion battery electrolyte solution of the present invention comprises an electrolyte salt and an organic solvent, wherein the organic solvent includes fluorocarboxylate, fluorocarbonate and 1,3-dioxolane. The fluorocarboxylate has a relatively low solidifying point and is suitable for being used as a low temperature electrolyte solution solvent; the fluorocarbonate is used as a cosolvent and is mixed with the fluorocarboxylate to adjust the low temperature performance and film-forming property of the electrolyte solution; and after 1,3-dioxolane , which has a low solidifying point and a low viscosity, is introduced, the impedance of the battery is significantly reduced. The low temperature-type lithium-ion battery electrolyte solution of the present invention can effectively improve the low temperature lithium-ion conductivity, which is beneficial for the exhibition of the capacity of a lithium-ion battery at a low temperature, and particularly can improve the specific discharge capacity and capacity retention ratio of a lithium iron phosphate lithium-ion battery at low temperature conditions.
Inventors:
FANG CHUN (CN)
LIU SHIQI (CN)
CHENG FANGYUAN (CN)
ZOU YUQIAN (CN)
LIU SHIQI (CN)
CHENG FANGYUAN (CN)
ZOU YUQIAN (CN)
Application Number:
PCT/CN2022/141945
Publication Date:
February 29, 2024
Filing Date:
December 26, 2022
Export Citation:
Assignee:
HUBEI WANRUN NEW ENERGY TECH CO LTD (CN)
International Classes:
H01M10/0569; H01M10/0525
Foreign References:
| CN115172882A | 2022-10-11 | |||
| CN104577197A | 2015-04-29 | |||
| CN112290086A | 2021-01-29 | |||
| CN109980225A | 2019-07-05 | |||
| JP2015195201A | 2015-11-05 |
Attorney, Agent or Firm:
ZHONG LUN LAW FIRM (CN)
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