Preparation method of ultralow-temperature battery

Abstract

The invention discloses a preparation method of an ultralow-temperature battery. The preparation method comprises the step of carrying out heat treatment on a lithium silicate negative electrode material to be treated in a fluorine-containing atmosphere to obtain the lithium titanate composite negative electrode material. The lithium titanate negative electrode material is subjected to heat treatment in an atmosphere containing fluorine gas. In the preparation method provided by the invention, the lithium titanate composite negative electrode material can improve the structural spinel, can improve the lithium storage stability and the rate capability of the spinel, reduces the capacity attenuation caused by the increase of the cycle index, and enables the lithium titanate battery to have excellent charging performance and low-temperature performance.

Description

technical field [0001] The present application relates to the technical field of lithium ion batteries, and in particular, to a preparation method of an ultra-low temperature battery. Background technique [0002] With the rapid development of the lithium battery industry, in the experience of using the backup power supply in the cold winter, there is often a shortage of mileage and kilometers, and the charging efficiency is slow, time-consuming, and cannot reach the ideal state. It reflects the charging performance very well. Although various auxiliary measures are used, such as applying a heating function in a low temperature environment, it also consumes the energy of the battery itself during the heating process. At present, the negative electrode material is usually changed from simply using graphite to Use hard carbon material or a composite material made of hard carbon material and graphite. [0003] The preparation of lithium-ion batteries in the related art can fur...

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Problems solved by technology

[0002] With the rapid development of the lithium battery industry, in the experience of using the backup power supply in cold winter, the mileage and kilometers are often insufficient. The charging efficiency is slow, time-consuming, and cannot reach the ideal state. The charging performance is very good. Although various auxiliary measures such as: applying heating function in low temperature environment, it also consumes the energy of the battery itself during the heating process. At present, the negative electrode material is usually changed from simply using graphite to Composite materials using hard carbon materials or hard carbon materials and graphite

[0003] Although the preparation of lithium-ion batteries in the related art can further improve the rate performance and energy density of the battery, once the temperature reaches below 0°C, various problems will occur, such as slow charging, insufficient charging or insufficient discharge. to kilometers, reduced low-temperature charging performance

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