Low-temperature-resistant electrolyte, battery and energy storage equipment

By introducing low-temperature-resistant additives of fluorocarboxylate with Formula I structure and oxazolidinone compounds with Formula II structure into the battery electrolyte, the problems of increasing the viscosity of the electrolyte and easy decomposition of the interface mask NaF in the low-temperature environment are solved, and the improvement of the battery cycle performance and the stability of the interface mask are achieved.

CN119725747APending Publication Date: 2025-03-28TIANMU LAKE INST OF ADVANCED ENERGY STORAGE TECH CO LTD
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Patent Information

Application Number
CN202411901286.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-23
Publication Date
2025-03-28

AI Technical Summary

Technical Problem

The increased viscosity of the electrolyte and easy decomposition of the interface mask NaF in a low-temperature environment leads to a degradation of the battery's circulation performance.

Method used

A low-temperature resistant electrolyte solution is used, including electrolyte salts, non-aqueous organic solvents and low-temperature resistant additives. The low-temperature resistant additives include fluorocarboxylic acid ester with the structure of Formula I and oxazolidinone compounds with the structure of Formula II.

Benefits of technology

It significantly improves the ion migration ability of the electrolyte in a low-temperature environment, improves the battery's conductivity and cycling performance, inhibits the decomposition of the interface mask, and extends the battery's cycle life.

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Abstract

The low-temperature-resistant electrolyte provided by the invention comprises electrolyte salt, a non-aqueous organic solvent and a low-temperature-resistant additive, and the low-temperature-resistant additive comprises one or more of fluorocarboxylate with a structure shown in a formula I and oxazolidinone compounds with a structure shown in a formula II, the structure of the formula I is # imgabs 0 #, and the structure of the formula II is # imgabs 1 #. The low-temperature-resistant electrolyte provided by the invention solves the problems of high electrolyte viscosity and unstable interface in a battery low-temperature environment, especially the problem that an interface film NaF in a sodium ion battery is easy to decompose, and the low-temperature cycle performance of the battery is improved.
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