Lithium titanate battery electrolyte film-forming additive doped with zirconium by gradients

Abstract

The invention discloses a lithium titanate battery electrolyte film-forming additive doped with zirconium by gradients, which is used for solving the problems that an SEI (Solid Electrolyte Interface) membrane is not formed on a lithium ion battery which takes lithium titanate doped with the zirconium by gradients as a cathode, electrolyte is directly contacted with the surface of an electrode to generate gas at high temperature. According to the lithium titanate battery electrolyte film-forming additive doped with the zirconium by gradients, the electrolyte film-forming additive is composed of lithium bisoxalateborate and lithium difluoroborate. With the adoption of the film-forming additive, the stable SEI membrane is formed between the lithium titanate cathode doped with the zirconium by gradients and the electrolyte, so that the direct contact between the electrolyte and the surface of the electrode is prevented and the problem that the lithium battery generates the gas is solved.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and in particular relates to a lithium ion battery electrolyte film-forming additive using gradient zirconium-doped lithium titanate as a negative electrode. Background technique [0002] As a new generation of green high-energy batteries, lithium-ion batteries have the advantages of small weight, high energy density, long cycle life, high working voltage, no memory effect, and no environmental pollution. They have been widely used in portable electronics such as mobile phones, notebook computers, and cameras. Among the equipment, it is also the preferred power source for electric vehicles and hybrid electric vehicles in the future, with broad application prospects and huge economic benefits. Among them, lithium titanate (LTO) has become one of the widely used new anode materials because of its unique structure and excellent electrochemical performance. People expect to use LTO instead ...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem that the existing lithium-ion battery with graded zirconium-doped lithium titanate as the negative electrode does not form an SEI film, which leads to direct contact between the electrolyte and the electrode surface and gas production at high temperature, the present invention provides a Lithium-ion battery electrolyte film-forming additive with gradient doped zirconium-doped lithium titanate as the negative electrode, which can form a stable SEI film between the gradient-doped zirconium-doped lithium titanate negative electrode and the electrolyte, thereby Prevent the direct contact between the electrolyte and the electrode surface, and solve the problem of lithium battery gas production