焙烧温度对溶胶-凝胶法制备磷酸钒锂的性能

Influences of roasting temperature on performance of lithium vanadium phosphate synthesized by sol-gel method

以柠檬酸为螯合剂和C源,采用溶胶-凝胶法合成了Li3V2(PO4)3。通过交流阻抗、恒电流充放电及XRD等进行测试和表征。结果表明,焙烧温度对材料电化学性能影响较大。700℃合成的样品综合电化学性能较好,首次放电比容量为105.6 mAh/g,循环10次后比容量保持在99.0%,并且晶体结构发育完整,粒度分布均匀。

A sol-gel method was adopted to prepare Li3V2 （PO4）3 with citric acid as chelator and C sources. The electrochemical and physical performance of the products was characterized through galvanostatic charge-discharge tests, XRD and SEM. The results show that general electrochemical properties of Li3V2 （PO4）3 are influenced by roasting temperature. The materials prepared at 700℃ have better electrochemical properties with the first discharge specific capacity of 105.6 mAh/g and capacity retention of 99.0% after 10 cycles. As-synthesized materials have well developed crystal structure and uniform grain distribution.