Electrolyte for expanding application temperature of lithium-ion battery and lithium-ion battery

Abstract

The invention relates to an electrolyte for expanding the application temperature of a lithium-ion battery and a lithium-ion battery, and belongs to the technical field of lithium-ion batteries. The electrolyte for expanding the application temperature of the lithium-ion battery comprises an additive Y and an additive A, wherein the additive Y is shown in the structure formula I in the description, and R1, R2 are independently one of substituted or unsubstituted C1-6 alkyl and alkoxy. In the electrolyte of the invention, the additive Y can be oxidized prior to a solvent at low potential, thereby improving the interface properties of the positive electrode and the electrolyte of the lithium-ion battery, being capable of inhibiting the dissolution of transition metal ions at a high temperature, and significantly improving the high-temperature performance; and the additive A and the additive Y can be oxidized prior to the solvent at high potential, thereby forming the interface propertiesof the negative electrode composited by an organic component with high lithium-conducting ions and an inorganic component with high stability and the electrolyte, and significantly improving the low-temperature charging and high-temperature performance of the lithium-ion battery.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to an electrolyte and a lithium-ion battery for widening the service temperature of the lithium-ion battery. Background technique [0002] Lithium-ion batteries have been used in various fields of life, such as mobile phones, laptop computers, electric vehicles, and artificial intelligence, because of their irreplaceable advantages such as good cycle performance, high working voltage, and environmental friendliness. At the same time, lithium-ion batteries have been applied to outdoor equipment such as hovercraft and large-scale energy storage. Therefore, lithium ions are required to be able to charge and discharge normally in both cold winter and hot summer. However, due to the low lithium intercalation potential of the commonly used graphite anode materials, lithium or lithium dendrites are easily formed when charged at low temperatures or at high rates. ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the low-temperature charging performance and high-temperature performance of the existing lithium-ion battery are difficult to balance, and to provide an electrolyte and a lithium-ion battery that widen the service temperature of the lithium-ion battery. The electrolyte can simultaneously improve the lithium-ion battery. Charging performance, and has good high temperature performance

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