Electrolyte and lithium-ion battery using it

Abstract

The application discloses an electrolytic solution and a lithium ion battery using the same. In the present application, a kind of electrolytic solution is provided, including the compound represented by formula I, additive, lithium salt and non-aqueous solvent; The electrolytic solution of the present invention is beneficial to reduce the The interfacial impedance reduces gas production, thereby improving the high-temperature cycle life and high-temperature storage capacity retention and recovery rate of lithium-ion batteries, improving the low-temperature discharge retention rate, and reducing volume expansion during high-temperature storage.

Description

technical field [0001] Embodiments of the present invention relate to an electrolyte solution and a lithium ion battery using the same. Background technique [0002] Lithium-ion batteries have the advantages of high voltage, high capacity, and long life, and are ideal energy sources for electric vehicles. Lithium-ion batteries mainly include: positive electrode, negative electrode, electrolyte and separator. The electrolyte is filled between the positive and negative plates and is the carrier of ion transmission in the battery. The inventors found in the research that an interface reaction occurs between the positive electrode material and the electrolyte. Under high temperature and high pressure, the side reaction at the interface between the positive electrode and the electrolyte is intensified, which seriously affects the high temperature cycle and storage performance. [0003] In the prior art, nitrile electrolyte additives are often used or combined with other additiv...

AI Technical Summary

Problems solved by technology

The inventors found in the research that an interface reaction occurs between the positive electrode material and the electrolyte. Under high temperature and high pressure, the side reaction at the interface between the positive electrode and the electrolyte is intensified, which seriously affects the high temperature cycle and storage performance.

[0003] In the prior art, nitrile electrolyte additives are often used or combined with other additives to improve the high temperature performance of lithium cobalt oxide positive electrode lithium ion batteries. An invention patent application with the authorized announcement number CN102637894B discloses a Electrolyte secondary battery, the electrolyte contains three additives of adiponitrile, fluoroethylene carbonate, and 2,3-dimethylmaleic anhydride, which can synergistically improve the cycle performance and high-temperature storage performance of lithium cobaltate at high voltage and improving high-temperature flatulence, the inventors found in the research, but the application of such additives in ternary cathode material batteries not only fails to improve the high-temperature performance of the battery, but also seriously deteriorates the battery rate performance and low-temperature performance

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