An electrolyte and a battery

Abstract

The invention relates to the field of energy storage materials, particularly to an electrolyte solution and a battery. The electrolyte solution of the invention comprises an organic solvent, an electrolyte and an additive, wherein the additive comprises a fluorophosphate compound and lithium sulfide. According to the electrolyte solution provided by the invention, the electrolyte solution comprises both fluorophosphate and lithium sulfide, so the high-voltage cycle performance, storage performance and overcharge performance of the battery can be remarkably improved.

Description

technical field [0001] The present application relates to the field of energy storage materials, in particular, to an electrolyte and a 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, batteries, especially lithium-ion secondary 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. [0003] At present, the positive electrode active materials used in lithium-ion secondary batteries mainly include lithium manganese oxide, lithium cobalt oxide, ternary materials, lithium iron phosphate, etc., under normal circumstances, the above-mentioned positive electrode materials are selected. The charging cut-off voltage of lithium-ion batteries does not exceed 4.2V, but with the adva...

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Problems solved by technology

[0004] However, for example, at a high voltage of 4.5V, the conventional electrolyte will be oxidized and decomposed on the surface of the positive electrode of the battery. The oxidative decomposition of the electrolyte itself will also promote the deterioration of the positive active material, which will further affect the performance of the lithium-ion secondary battery. , such as cycle performance, storage performance and overcharge performance

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