Lithium ion battery and electrolyte solution thereof

Abstract

The invention discloses a lithium ion battery and an electrolyte solution thereof. The electrolyte solution contains lithium salt, a non-aqueous organic solvent and additives, wherein the additives comprise perfluoroalkylacyl melamine derivatives. Compared with the prior art, the perfluoroalkylacyl melamine derivatives as the additives are added into the electrolyte solution of the lithium ion battery, and the additives and a trace amount of HF and H2O in the electrolyte solution form stable hydrogen bonds, so that the compatibility of an anode and a cathode of the battery is not influenced, the hydrolytic and pyrolytic reaction of LiPF6 can be also inhibited, the storage stability and cycle performance of the electrolyte are improved, an SEI (solid electrolyte interface) film is protected, and the capacity fade of the battery in the storage and cycle processes is reduced; and in addition, the additives are low in toxicity, cheap and very low in influence on the viscosity and the electric conductivity of the electrolyte solution, and not only can improve the electrochemical and cycle performances of the lithium ion battery but also does not increase the cost.

Description

technical field [0001] The invention relates to a lithium ion battery, in particular to a lithium ion battery electrolyte capable of effectively improving battery cycle and storage performance. Background technique [0002] Lithium-ion batteries have unique advantages such as high specific energy, high working voltage, wide application range, low self-discharge rate, long cycle life, no pollution, and good safety performance. Therefore, they have been used as new energy sources in many fields. [0003] Organic electrolyte is an important part of lithium-ion batteries, which has an important impact on the main performance of the battery, such as operating temperature, specific capacity, cycle efficiency, and safety. During the production and storage of the electrolyte, the moisture and free acid in the electrolyte are often high due to various reasons such as the deterioration of the dry environment, poor sealing of the storage equipment, or the use of solvents, high moisture...

AI Technical Summary

Problems solved by technology

However, ethanolamine, thiocyanate and isothiocyanate compounds are not only flammable, toxic, but also highly irritating and easy to oxidize, so they are not suitable for industrial production of lithium-ion battery electrolytes

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