Mixed non water electrolyte additive for improving battery high-temperature performance

Abstract

The invention relates to a mixed type non-water electrolytic solution additive used for improving high temperature performance of a cell, which is characterized in that the additive comprises mixture of 1-propenyl phosphonic cyclic acid anhydride, ethyl acetate, as well as vinyl enthylene elayl carbonic ester, and is dissolved in the non-water electrolytic solution; the ratio of addition of the 1-propenyl phosphonic cyclic acid anhydride and the weight share of the non-water electrolytic solution is 0.05-5.0:100; the ratio of weight shares of the ethyl acetate and the non-water electrolytic solution is 0.05-5.0:100; the ratio of addition of the vinyl enthylene elayl carbonic ester and the non-water electrolytic solution is 0.05-5.0:100. The 1-propenyl phosphonic cyclic acid anhydride in the component of the invention can effectively inhibit expansion in the process of high-temperature storage and circulation through inhibit CO2 generated effect; at the same time, the vinyl enthylene elayl carbonic ester can improve the cell capacity under the conditions of high-temperature storage and circulation through effectively protecting SEI membrane. The addition agent can effectively improve the cell performance on high-temperature storage and high-temperature circulation, as well as make the cell maintain good low-temperature electric discharge characteristic.

Description

technical field [0001] The invention relates to a non-aqueous electrolyte mixed additive, in particular to a mixed non-aqueous electrolyte additive for improving the high-temperature performance of batteries. Background technique [0002] As the carrier of ion movement in lithium-ion batteries, non-aqueous electrolytes are basically stable in composition, mainly including EC, PC, EMC, DEC, etc. With the continuous promotion of battery applications, the research on additives to meet different performance requirements is becoming more and more There are many, especially the additives used to improve the safety characteristics of batteries, such as additives to prevent battery overcharge, additives to prevent battery hot box failure, etc., have made great contributions to improving the safety performance of lithium batteries. In recent years, with the deepening of people's understanding of battery usage conditions, it is found that in many cases, the battery is used under the c...

AI Technical Summary

Problems solved by technology

However, many electrolyte improvement formulas often start with the basic components of the electrolyte, which improves the high-temperature performance, but loses the low-temperature performance, and still cannot meet the needs of batteries.

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