Electrolyte and battery comprising same

Abstract

The invention provides an electrolyte and a battery comprising the electrolyte. The electrolyte comprises a non-aqueous organic solvent, a first additive, a second additive and a lithium salt; the first additive comprises a nitrogen-containing heterocyclic carboxylic ester compound; and the second additive comprises an acid anhydride thiophene compound. According to the electrolyte, the first additive has good film-forming property and low impedance on the surfaces of the positive electrode and the negative electrode at the same time, the second additive has film-forming property on the positive electrode, a protective film with high oxidation resistance and low impedance can be formed on the surfaces of the electrodes through mutual cooperation of the first additive and the second additive, and the high safety and high and low temperature performance of the electrolyte are improved; and the battery comprising the electrolyte has high anti-overcharge safety and also has good high and low temperature performance.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to an electrolyte and a battery including the electrolyte, in particular to an electrolyte suitable for high energy density batteries and a battery including the electrolyte. Background technique [0002] In recent years, lithium-ion batteries have been widely used in smartphones, tablet computers, smart wearables, power tools, and electric vehicles. With the wide application of lithium-ion batteries, the usage environment and demand of consumers for lithium-ion batteries continue to increase, which requires lithium-ion batteries to have the characteristics of both high and low temperature performance. However, there are potential safety hazards in the use of lithium-ion batteries. When the battery is in some abuses such as overcharging, it is prone to serious safety accidents, fires or even explosions; Difficult problems have caused great distress to consumers. [000...

AI Technical Summary

Problems solved by technology

In order to solve these problems, the safety performance can be improved by adding anti-overcharge additives (such as biphenyl, cyclohexylbenzene, etc.) High temperature cycle and storage performance, serious gas production

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