锂离子电池正极材料纳米LiFePO_4

Nano-Sized LiFePO_4 as Anode Material in Lithium Ion Battery

综述了LiFePO4的晶体结构、充放电机理、电化学性能、存在问题以及纳米技术近年来在LiFePO4中应用的最新进展。纳米LiFePO4的制备方法主要有高温固相反应法、水热合成法、溶胶凝胶法、微波合成法等。材料的粒径大小及分布、离子和电子的传导能力对产品的电化学性能影响较大,在制备时采用惰性气氛、掺杂改性以及控制晶粒的生长尺寸是关键,电极材料的微纳米化对锂离子电池的电化学性能和循环性能的改善有着显著的意义,展望了纳米正极材料LiFePO4用于锂离子电池的未来前景。

The development of LiFePO4 in recently years is summarized, including the crystal structures, charge-discharge mechanism, electrochemical property, existing problems and nanotechnology application. The preparation methods of nano-sized LiFePO4 are high temperature solid-state reaction method, hydrothermal synthesis, sol-gel method, microwave synthesis and so on. Particle size and its distribution, ionic and electronic conductivity have much effect on electrochemical performances of the products. The use of inert gas, the addict of conductive dope and the control of crystal size are the most important in the preparation. The electrochemical property and circulation performance of lithium ion battery are improved remarkably by nano or micro anode materials. The prospects of the nano-scale anode materials LiFePO4 for lithium ion batteries are predicted.