Electrolyte solution for lithium titanate battery and lithium titanate battery thereof

Abstract

The invention discloses an electrolyte solution for a lithium titanate battery and the lithium titanate battery thereof. The electrolyte solution for the lithium titanate battery comprises lithium salt, organic solvent and additive, wherein the additive is formed by the following ingredients through adopting the total weight of the electrolyte solution as the standard: 1.5-3.5 percent of dimethyl carbonate, 0.05-0.25 percent of ethylene carbonate, 0.15-0.35 percent of LiBOB, 0.1-0.45 percent of vinylene carbonate, 0.07-0.35 percent of crown ether, 0.04-0.06 percent of LiF, 0.05-0.065 percent of monofluoro ethylene carbonate, 0.05-0.25 percent of phenylcyclohexane, 0.1-0.45 percent of biphenyl, and 0.1-0.45 percent of 1,3-propane sultone. According to the electrolyte solution for the lithium titanate battery, the stability of a high-temperature SEI film under high temperature is improved, the resistance to high temperature of the electrolyte solution is improved, the cycle performance is excellent, the service life is prolonged, and meanwhile, the high-and-low temperature performance and the flame retardant property are improved.

Description

technical field [0001] The invention relates to the field of batteries, in particular to an electrolyte solution for a lithium titanate battery and the lithium titanate battery. Background technique [0002] At present, most commercial lithium-ion battery anode materials are lithium-intercalated carbon materials. Since the potential of the carbon electrode after lithium intercalation is very close to that of metal lithium, when the battery is overcharged, metal lithium is easily precipitated on the surface of the carbon electrode, and it interacts with the electrolyte. The reaction produces a flammable gas mixture, thus causing a great safety hazard to the battery, especially the power battery. At the same time, the graphite electrode also has the problem of co-intercalation of the electrolyte, which will also affect the cycle stability of the electrode. Therefore, it is necessary to find new anode materials that can intercalate lithium at a slightly positive potential than...

AI Technical Summary

Problems solved by technology

However, in practical applications, it has been found that batteries with lithium titanate as the negative electrode tend to swell at high temperatures. This phenomenon is especially obvious for soft-pack batteries, and the high and low temperature performance is poor.