Electrolyte solution compatible with lithium-ion battery anode material lithium titanate

Abstract

The invention discloses an electrolyte solution compatible with a lithium-ion battery anode material lithium titanate. The electrolyte solution is prepared from a solvent, electrolyte and an additive, wherein the solvent is prepared from methyl ethyl carbonate (MEC), propylene carbonate (PC) and ethylene carbonate (EC) at the mass ratio of (1-3) to (2-4) to (4-6); the electrolyte is LiPF6; the additive is LiBOB; the concentration of the electrolyte in the solvent is 0.8-1.1mol / L; the mass of the additive is 1.0%-3.0% of the mass of the solvent; the LiBOB in the electrolyte solution can form an SEI film on the lithium titanate surface; the solvent is prevented from being reduced and decomposed on the surface; the resistance of the lithium titanate surface is reduced; the charge-discharge specific capacity is improved; and the cycle performance of a battery is improved. The electrolyte solution disclosed by the invention is good in compatibility with the lithium titanate; the performance of the lithium-ion battery employing the lithium titanate as an anode material can be improved; the service life of the lithium-ion battery is prolonged; and the electrolyte solution has a potential application prospect.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and relates to an electrolytic solution compatible with lithium titanate, a negative electrode material of the lithium ion battery. Background technique [0002] Lithium-ion batteries (referred to as lithium batteries) have been developed rapidly since they were industrialized by Sony Corporation in 1992 due to their outstanding advantages such as high energy density, long cycle life, low self-discharge rate, no memory effect, and environmental protection. Lithium-ion batteries are mainly composed of four parts: positive electrode materials, negative electrode materials, separators and electrolytes, all of which have an important impact on the performance of lithium-ion batteries. At present, the commonly used anode material for lithium-ion batteries is graphite carbon material. Lithium titanate (Li 4 Ti 5 o 12 ) is also a negative electrode material that has been studied more in scientif...

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Problems solved by technology

[0003] At present, some patents at home and abroad disclose lithium titanate and its compatible electrolyte, most of which focus on reducing battery flatulence and improving battery performance. Some patent additives have not been confirmed to have safety hazards in use, etc.

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