Recently, the team of Henan University of Technology Professor Cao Xiaoyu first prepared a new type of composite cathode material that can improve the electrochemical properties of Lithium Vanadate as a cathode material for rechargeable lithium batteries. Related research was published online in the American Journal of Applied Materials and Interfaces .
Lithium-ion batteries have been considered as one of the most promising energy storage methods because of their high energy density, and they have been commercialized in the field of electric vehicles. Continue to increase the energy density of lithium-ion batteries is still a relentless pursuit of researchers. Lithium-ion battery capacity is mainly determined by the capacity of the positive electrode material. The search for positive electrode materials with high discharge capacity and stability is the key to improving the energy density of lithium-ion batteries. Layered lithium vanadate cathode materials capable of multi-electron transport have high The discharge capacity has attracted people's attention due to its low cost and good safety. However, the material has low electronic conductivity, irreversible phase change during charging and discharging, and part of vanadium is dissolved in the electrolyte, resulting in material magnification. Poor performance and cycle performance.
The researchers used a rheological phase reaction method to prepare high-capacity lithium vanadate cathode materials, and prepared lithium vanadate/polydiphenylamine composite cathode materials for the first time by in-situ oxidative polymerization reaction with diphenylamine monomers. Among them, polydiphenylamine main chain In addition to having a poly-p-phenylene structure with high conductivity, it also has an aniline structure with a high energy density, and thus has an ultra-fast electron transfer rate, a good hole transport ability, and a good redox reversibility.
