Electrolyte and lithium ion battery comprising same

Abstract

The invention relates to an electrolyte and a lithium ion battery comprising the same. The electrolyte comprises an organic solvent, a lithium salt, vinylene carbonate, fluoroethylene carbonate and a combined additive, wherein the combined additive comprises the following raw materials by percentage: 0.1%-7% of propane sultone, 0.1%-7% of ethylene sulfate and 0.1%-9% of adiponitrile on the basis of total weight of the electrolyte. The electrolyte provided by the invention is applied to the lithium ion battery, so that the initial efficiency, the cycle performance, the high-temperature storage performance, the overcharge resistance performance and the safety performance of the lithium ion battery at high voltage of above 4.4V can be greatly improved.

Description

technical field [0001] The present application relates to the field of lithium-ion batteries, in particular, to an electrolyte and a lithium-ion battery including the electrolyte. Background technique [0002] Lithium-ion batteries have significant characteristics such as high voltage, high capacity, and long life. More and more research is expanding the market for large-capacity lithium-ion batteries such as electric vehicles. In order to meet higher requirements, the research on positive and negative electrode materials and electrolytes of lithium-ion batteries is also being deepened. Among them, the research on the characteristics of the electrode / electrolyte interface has attracted much attention, for example, the solid electrolyte interface on the surface of the carbon negative electrode (solid electrolyte interface, referred to as SEI) film properties, its film formation mechanism and carbon material surface modification research. [0003] Research in recent years has...

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Problems solved by technology

However, under the high voltage system above 4.4V, it still shows poor cycle performance and storage performance

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