A high-voltage electrolyte and its preparation method and application

By using high-voltage electrolytes in sodium-ion batteries, which contain specific film-forming additives and sodium salts, a stable interfacial film is formed, which solves the problems of poor fast charging performance and poor cycle stability of sodium-ion batteries and achieves good battery performance at high voltage.

CN115275340BActive Publication Date: 2025-09-05HUNAN FARNLET NEW ENERGY TECH CO LTD
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Patent Information

Application Number
CN202210948768.6
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-08-09
Publication Date
2025-09-05
Estimated Expiration
2042-08-09

AI Technical Summary

Technical Problem

Existing sodium-ion batteries have problems with poor fast-charging performance and poor cycling stability in high-energy-density sodium vanadium phosphate batteries, especially due to side reactions caused by slow interfacial sodium ion transport kinetics and electrolyte decomposition.

Method used

A high-voltage electrolyte is used, containing 3-(((guanidino-4-thiazolyl)methyl)thio)propylimidate and benzotriazole-N,N,N',N'-tetramethyluronium hexafluorophosphate as film-forming additives to form a stable positive and negative electrode interface film, combined with sodium tetrafluoroborate and sodium difluorooxalatoborate as sodium salts, and a carboxylic acid ester solvent to improve the electrolyte performance.

Benefits of technology

The cycle stability, fast charging performance and low-temperature performance of sodium-ion batteries at high voltage are improved. By forming a dense interface film with good ion conductivity, side reactions are inhibited, and the battery structure stability and safety are improved.

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Abstract

The present invention relates to a high-voltage electrolyte and a preparation method and application thereof, belonging to the technical field of sodium ion batteries; the high-voltage electrolyte includes the following preparation raw materials: sodium salt, organic solvent, 3-(((guanidino-4-thiazolyl)methyl)thio)propylimidate and benzotriazole-N,N,N',N'-tetramethyluronium hexafluorophosphate; wherein the mass fraction of 3-(((guanidino-4-thiazolyl)methyl)thio)propylimidate in the high-voltage electrolyte is 0.5% to 2.5%; the mass fraction of benzotriazole-N,N,N',N'-tetramethyluronium hexafluorophosphate in the high-voltage electrolyte is 0.5% to 2%; the sodium salt includes sodium tetrafluoroborate and sodium difluorooxalatoborate; the organic solvent is composed of carbonate and carboxylate. The present invention can make the sodium ion battery have good cycle performance, fast charging performance and low temperature performance at high voltage through the synergistic effect of each component of the electrolyte.
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