Professor of Henan University of Technology developed high-performance lithium-ion battery composite materials developed into

Lithium Grid News: Recently, the team of Professor Xiaoyu Cao of Henan University of Technology prepared a new type of composite cathode material for the first time, which can improve the electrochemical properties of lithium vanadate, a cathode material for rechargeable lithium batteries.

　　 Lithium-ion battery is considered to be one of the most promising energy storage methods due to its high energy density. Commercial applications have been launched in the field of electric vehicles. It is still research to continue to improve the energy density of lithium-ion batteries. The unremitting pursuit of the author.

Currently, the capacity of lithium-ion batteries is mainly determined by the capacity of cathode materials. Finding cathode materials with high discharge capacity and stability is the key to improving the energy density of lithium-ion batteries. The layered lithium vanadate cathode material capable of multi-electron transport has high discharge capacity and has attracted people's attention due to its low cost and good safety. However, the material has low electronic conductivity and is easy to produce irreversible phases during charging and discharging. In addition, part of the vanadium element is dissolved in the electrolyte, resulting in poor rate performance and cycle performance of the material.

　　 researchers used rheological phase reaction method to prepare high-capacity lithium vanadate cathode material. Through on-site oxidative polymerization with diphenylamine monomer, lithium vanadate was prepared for the first time. Polydiphenylamine composite cathode material. Among them, the main chain of polydiphenylamine not only has a poly-p-phenylene structure with higher conductivity, but also has an aniline structure with higher energy density, which has ultra-fast electron transfer rate, good hole transport ability and good redox Reversibility.