Composite electrolyte and preparation method and application thereof

By adding specific additives to the electrolyte of lithium-ion batteries and optimizing their formulation and proportion, the problem of lithium-ion batteries being easily thermally runaway at high temperatures is solved, and the thermal safety performance and cycle life of the battery are significantly improved.

CN119650852APending Publication Date: 2025-03-18ENKE TIANRUN NEW ENERGY MATERIALS (SHANDONG) CO LTD
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Patent Information

Application Number
CN202411821803.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-11
Publication Date
2025-03-18

AI Technical Summary

Technical Problem

The electrolyte of existing lithium-ion batteries is prone to thermal runaway at high temperatures, leading to high risk of fire and explosion accidents, and flame retardant additives are unfavorable to the stability of solid electrolyte membranes.

Method used

A composite electrolyte was designed. By adding methyl trimethoxysilane, 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether and triethylene glycol monomethyl ether as additives to the electrolyte, its formulation and addition ratio were optimized to improve the thermal safety performance of the battery.

Benefits of technology

The composite electrolyte can effectively reduce the flammability of traditional organic electrolytes, inhibit or avoid the combustion of lithium-ion batteries, and improve the thermal stability and cycle life of the battery.

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Abstract

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a composite electrolyte and a preparation method and application thereof, the composite electrolyte comprises an organic solvent, an electrolyte lithium salt and an additive; and the additive comprises methyl trimethoxy silane, 1, 1, 2, 2-tetrafluoroethyl-2, 2, 2-trifluoroethyl ether and triethylene glycol monomethyl ether. By optimizing the formula and the adding proportion of the composite electrolyte additive, the thermal safety performance of the battery can be improved, the safety problem caused by thermal runaway is reduced, the flammability of the traditional organic electrolyte is reduced, and the combustion of the rechargeable battery is inhibited or avoided. In a charge-discharge test, the battery added with the composite flame retardant slightly improves the charge storage capacity of the battery at high temperature, and the specific capacity of the battery is improved; according to the present invention, under the variable magnification charge-discharge condition, the high specific capacity can be maintained, the rapid charge-discharge can be performed under the large current condition, the low energy consumption and the low heat generation can be maintained, and the strong high temperature stability can be provided;
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