Electrolyte for lithium titanate battery and battery product prepared from electrolyte

Abstract

The invention discloses an electrolyte for a lithium titanate battery and a battery product prepared from the electrolyte. The electrolyte is prepared from solutes, a solvent and an additive through mixing, wherein the additive is alkyl phosphoric anhydride, and alkyl phosphoric anhydride accounts for 0.1%-10% of the electrolyte for the lithium titanate battery in percentage by mass. The formula of the electrolyte for the lithium titanate battery is ingenious in design, alkyl phosphoric anhydride is added reasonably, the content of alkyl phosphoric anhydride is set scientifically, alkyl phosphoric anhydride can react with water of a lithium titanate pole piece to consume water, furthermore, acidity of produced alkyl phosphonic acid is low, positive and negative poles of the battery cannot be damaged, so that the gas production rate is reduced, expansion of the battery during high-temperature storage is greatly reduced, the high-temperature cycle life of the lithium titanate battery is prolonged, and better high-temperature storage property and cycle performance are realized; the battery product prepared from the electrolyte for the lithium titanate battery is simple in structure and easy to produce and has the better high-temperature storage property and cycle performance and good combination property, and wide popularization and application are facilitated.

Description

technical field [0001] The invention belongs to the technical field of lithium titanate batteries, and in particular relates to an electrolyte solution for lithium titanate batteries and battery products thereof. Background technique [0002] Compared with lead-acid batteries, nickel-cadmium batteries, and nickel-hydrogen batteries, lithium-ion secondary batteries have higher operating voltage, cycle life and specific energy, and have been widely used. Compared with graphite negative electrode, lithium titanate negative electrode has longer cycle life, low temperature, large rate and safety. The main manifestations are as follows: [0003] 1. Lithium titanate is a zero-strain material, which hardly changes in volume when fully charged and fully discharged, and has a longer cycle life. [0004] 2. The potential of lithium titanate relative to lithium is about 1.55V, which is much higher than the potential of lithium analysis, so there will be no safety problems caused by gr...

AI Technical Summary

Problems solved by technology

[0007] However, the lithium titanate battery has the following defects: the battery is easy to swell during high temperature storage and cycle, which affects the cycle and safety performance of the battery

The reasons are as follows: 1. Lithium titanate has a large specific surface area and is easy to absorb water; 2. Lithium titanate may contain crystal water, which is difficult to remove even if it is baked at high temperature; 3. The tetravalent titanium of lithium titanate has strong The catalytic activity of the electrolyte, the solvent of the electrolyte is easy to undergo a reduction reaction on the surface of lithium titanate, especially at high temperatures.

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