Lithium battery composite electrode active material and application thereof

Abstract

The invention relates to the technical field of lithium batteries, and discloses a lithium battery composite electrode active material and application thereof. The electrode active material is composed of a graphite material, lithium titanate and tin disulfide. According to the lithium titanate / tin disulfide / carbon composite electrode active material provided by the invention, through the composite action of the three components, the defects can be mutually compensated, so that the prepared battery has high energy density and fast charge capacity at the same time, and the preparation process is close to the existing lithium ion battery production process, and is suitable for batch production.

Description

technical field [0001] The present application relates to the technical field of lithium batteries, in particular to a lithium battery composite electrode active material and its application. Background technique [0002] Today, lithium-ion batteries play an important role in energy storage in everyday life. However, in different scenarios, people have different requirements for energy storage devices. For example, in new energy vehicles, not only high energy density but also high power density are required; in addition, due to the use of high-nickel materials, although in terms of capacity It can be improved, but it is also accompanied by safety and other issues. To sum up all the issues, people still need to continue to in-depth research on the power, battery life, and life of lithium-ion batteries. For lithium-ion battery anode materials, we hope to obtain higher theoretical specific capacity, better rate performance, and enhanced safety and stability. [0003] The curr...

AI Technical Summary

Problems solved by technology

The theoretical capacity of graphite is 372mAh / g, which is cheap and environmentally friendly. It occupies the main market of lithium-ion batteries, but at the same time, there is a risk of thermal runaway of the battery due to lithium precipitation; although the theoretical specific capacity of lithium titanate is only 175mAh / g, However, due to the stable charge and discharge structure, long cycle life, high rate performance charge and discharge, and performance can still be maintained in extreme temperature environments, it also has an advantage in some specific scenarios; The pursuit of density is getting higher and higher, silicon-based and tin-based will be the next research and development focus

[0004] At present, the main reason why silicon-based and tin-based materials cannot be commercialized is because silicon-based and tin-based materials undergo severe volume expansion and contraction during charging and discharging, and are prone to structural collapse and material crushing, resulting in poor cycle performance.

Images