Novel multifunctional electrolyte

Abstract

Provided is a novel multifunctional electrolyte which comprises lithium salts, a novel cosolvent and a functional compound. The novel cosolvent comprises line style carbonic ester and annular carbonic ester, wherein, line style carbonic ester with a low melting point and low viscosity accounts for the majority of the novel cosolvent, and the novel cosolvent is enabled to perform good charge and discharge performance at low temperature by compounding line style carbonic ester and annular carbonic ester according to an optimized ratio. The functional compound is obtained by mixing compounds A and compounds B, wherein, compounds A have a good film forming characteristic and maintain stable at high temperature, which enables cycle performance of a battery to be effectively improved, pneumatic swelling of the battery to be avoided and high temperature performance of the battery to be enhanced, and compounds B are phosphate ester compounds with a low melting point, which enables low temperature performance of the battery to be further enhanced on the one hand and safety performance of the battery to be substantially improved on the other hand thanks to the flame retardation characteristic of phosphate ester compounds. Through component and ratio optimization, the problems of low temperature performance, high temperature performance, safety performance, cycle performance and pneumatic swelling of the electrolyte are well solved simultaneously.

Description

technical background [0001] The invention relates to the technical field of lithium ion batteries, in particular to a novel multifunctional electrolyte suitable for lithium ion batteries technical background [0002] In the context of energy crisis, resource scarcity, and environmental pollution, lithium-ion batteries are widely used in various fields such as communications, digital, transportation, and aerospace due to their high operating voltage, long cycle life, high energy density, and environmental protection. become the trend of new energy development. [0003] However, lithium-ion batteries have a narrow operating temperature range, poor discharge performance at low and high temperatures, and even safety hazards at high temperatures. These have become bottlenecks for the further development of lithium-ion batteries. [0004] The high and low temperature performance of lithium batteries is mainly determined by the electrolyte. As an important part of the battery, th...

AI Technical Summary

Problems solved by technology

These patents often only improve a certain performance of the battery, while other performances are not taken into account