High-rate high-energy density lithium ion battery

Abstract

The invention discloses a high-rate high-energy density lithium ion battery. Through formulation optimization of a lithium nickel cobalt manganate anode material, structural stability and cycle stability of the anode material at high energy density are improved, and a nano-conductive material is filled in the middle of voids of spherical-like positive electrode particles; under the premise of notaffecting the volumetric energy density of the material, the conductivity of the material and high rate discharge characteristics of the material are both improved. Aluminum oxide coating is coated ona microporous film to improve high temperature resistance and electrolyte absorption retention performance of the microporous film, 1,3-propane sultone is utilized to improve high temperature stability of a high nickel positive electrode, the lithium dioxalate borate is added to improve oxidation resistance of the electrolyte, a stable SEI film is formed on a surface of the positive electrode, the internal hydrofluoric acid content of the battery is reduced, damage of the hydrofluoric acid to the positive electrode material is reduced, and battery performance is improved.

Description

technical field [0001] The invention relates to a lithium ion battery with high rate and high energy density. Background technique [0002] At present, the high-rate lithium-ion battery 18650 type produced in China has a maximum capacity of 2000mAh that can be continuously discharged at a current of 20A. [0003] Some industries require batteries with more capacity to extend battery life, and the original volume cannot be changed for easy installation. The design of batteries that lead to high-rate discharge requires lower material compaction density, more conductive materials, and thicker current collectors to ensure high-rate discharge performance and avoid cycle performance degradation caused by excessive temperature rise and lithium precipitation . However, high energy density batteries require higher material compaction density and less auxiliary materials to provide space for active materials. Therefore, high rate discharge characteristics and high energy density ch...

AI Technical Summary

Problems solved by technology

[0003] Some industries require more capacity batteries to extend battery life, and the original volume cannot be changed for easy installation