Non-aqueous lithium battery electrolyte and secondary lithium battery

Abstract

The invention relates to a non-aqueous lithium battery electrolyte and a secondary lithium battery, and mainly solves the technical problems of poor cycle performance and large internal resistance of a lithium ion battery at a high temperature. The problem is well solved by adding an additive (R1, R2, R3, R4, R5 and R6 are respectively and independently selected from hydrogen, hydroxyl, halogen, alkyl, alkoxy, halogenated alkoxy, halogenated alkyl, alkylene, halogenated alkylene, amino, ester group, aryl or nitrile group) with a structural general formula as shown in the specification, wherein R1, R2, R3, R4, R5 and R6 are respectively and independently selected from hydrogen, hydroxyl, halogen, alkyl, alkoxy, halogenated alkoxy, halogenated alkyl, alkylene, halogenated alkylene, amino, ester group, aryl or nitrile group. Therefore, the non-aqueous lithium battery electrolyte and the secondary lithium battery have better high-temperature cycle performance, internal resistance performance and higher ionic conductivity.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a non-aqueous lithium battery electrolyte and a secondary lithium battery. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, good cycle performance, long storage time, and small self-discharge. As an ideal energy storage device, it is expected to gradually replace traditional energy storage devices such as lead-acid batteries, nickel-cadmium batteries, and nickel-hydrogen batteries. With the development of new energy, the use of clean energy has become more and more extensive, ranging from electronic components to automobiles and airplanes, and lithium-ion batteries are used in almost all places where power is used. Lithium-ion batteries are used in people's daily life. increasingly important. Therefore, in recent years, lithium-ion battery technology has developed rapidly, and the broad market has provided lithium-ion batteries wi...

AI Technical Summary

Problems solved by technology

However, the film formed by adding vinylene carbonate is easily decomposed at high temperature and is continuously destroyed, which makes the lithium-ion battery unable to function at high temperature.

For another example, adding additives such as bisoxalate lithium borate into the electrolyte can form a good film at high temperature, but due to the large thickness of the film and the relatively low conductivity of the film, the internal resistance of the lithium-ion battery will be too high. Large, thus affecting the performance of lithium-ion batteries

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