Electrolyte and lithium ion battery

Abstract

The invention provides electrolyte and a lithium ion battery. The electrolyte contains lithium salt, an organic solvent and an additive, wherein the organic solvent contains a carboxylic ester compound; and the additive contains a dinitrile compound containing a carbon-carbon double bond and a silicon alkyl sulfate compound. By applying the electrolyte to the lithium ion battery, the high-temperature storage performance, high-temperature cycle performance and rate capability of the lithium ion battery can be simultaneously improved.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to an electrolyte and a lithium ion battery. Background technique [0002] In the rapidly developing information age, the demand for mobile phones, notebooks, cameras and other electronic products is increasing year by year. As the working power source of electronic products, lithium-ion batteries have the characteristics of high energy density, no memory effect, and high working voltage, and are gradually replacing traditional Ni-Cd and MH-Ni batteries. However, with the expansion of market demand for electronic products and the development of power and energy storage equipment, people's requirements for lithium-ion batteries continue to increase, and the development of lithium-ion batteries with high energy density and fast charging and discharging has become a top priority. At present, the effective method is to increase the voltage and compaction density of the electrode materi...

AI Technical Summary

Problems solved by technology

[0003] At present, the widely used electrolyte of lithium-ion batteries includes lithium hexafluorophosphate as a conductive lithium salt and a mixture solvent of cyclic carbonate and chain carbonate. However, there are still many deficiencies in the above electrolyte, especially under high voltage, The performance of lithium-ion batteries is poor, such as poor high-temperature cycle performance, poor high-temperature storage performance, and poor rate performance

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