Surface modification of LiFePO4 by Coatings for Improving of Lithium-ion Battery Properties
Qunfang Zhao, Yonghui Yu, Quansheng Ouyang, Min-yi Hu, Chang Wang, Jianhua Ge, Shuqiong Zhang, Guanghui Jiang
Abstract
High-energy-density, high-safety, long-cycle-life and low-cost lithium-ion batteries are urgently needed for electric vehicle power batteries and energy storage battery markets. As a candidate cathode material, LiFePO 4 has attracted extensive attention because of its high theoretical capacity, high safety and low cost. Unfortunately, LiFePO 4 suffers from low tap density, poor intrinsic electronic and ionic conductivity, and a slow Li + diffusion coefficient. On the subject, the surface coating is considered an available method. A suitable surface coating can enhance the surface structure stability of the LiFePO 4 material, accelerate the electron and Li + migration, prevent the side reaction between LiFePO 4 electrode and electrolytes and protect LiFePO 4 from HF corrosion. Hence, the article discusses the research progress of several typical surface coating materials to improve the electrochemical performance of LiFePO 4 in recent years to supply a guide for optimizing the performance of other battery materials.