Electrolyte for improving high temperature performance of lithium manganate power battery and lithium manganate power battery

Abstract

The invention provides an electrolyte for improving high temperature performance of a lithium manganate power battery and the lithium manganate power battery. The electrolyte comprises the following components: 75wt%-88wt% of non-aqueous organic solvent, 10wt%-17wt% of lithium salt, 0.5wt%-6wt% of film forming additive, 0.5wt%-5wt% of high temperature additive, 0.5wt%-3wt% of surfactant and 0.001wt%-1wt% of stabilizing agent; the electrolyte is capable of inhibiting the capacity reduction of spinel LiMn2O4 under high temperature through control of proportion of non-aqueous organic solvent, application of combination of LiPF6 and novel lithium salt, and addition of the film forming additive, the high temperature additive, the surfactant and the stabilizing agent which have cooperative effect. The high temperature cycle performance of the lithium manganate power battery by using the electrolyte can be obviously increased.

Description

technical field [0001] The invention belongs to the field of lithium-ion power batteries, and in particular relates to an electrolyte solution for improving the high-temperature performance of a lithium manganate power battery and the lithium manganate power battery. Background technique [0002] Due to the advantages of relatively high energy density, small self-discharge, no memory effect, long cycle life and environmental friendliness, lithium-ion secondary batteries are widely used in various portable electronic products and communication tools. In recent years, the rapid development of the automobile industry has also exacerbated the crisis of energy and environment. According to statistics, 63% of air pollution comes from fuel vehicles, which prompts the country to increase research and development of electric vehicles and hybrid vehicles. Lithium-ion secondary batteries will have very important application prospects in electric vehicles and energy storage equipment. ...

AI Technical Summary

Problems solved by technology

Although the dissolution of manganese at normal temperature is not great, the dissolution of manganese is accelerated at high temperature. The main reason is that the reaction of water to produce acid is accelerated at high temperature, thereby deactivating the positive electrode and causing the cycle performance of lithium manganate battery to deteriorate.

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