固相法合成锂离子电池正极材料LiFePO_4

Solid-state reaction preparation of LiFePO_4 as cathodematerials for lithium-ion battery

橄榄石型LiFePO_4是近年发展起来的一种锂离子电池正极材料, 它的理论容量为 170mA·h/g, 具有价格便宜、环境友好、无毒、无吸湿性、热稳定性好等优点, 越来越受到人们的重视. 通过固相法制备LiFePO_4, 分别考察了锂铁摩尔比与烧结时间对于LiFePO_44 的电化学性能的影响. 结果表明, 最佳的锂铁摩尔比为1 .05, 最佳的烧结时间应为 24 h, 在 0 .1C倍率下放电, 初始放电容量为140. 4 mA·h/g.

Olivine LiFePO_4 is a new kind of cathode material for lithium-ion battery. This material is cheap and environmentall friendly. It has a relatively large theoretical capacity of 170 mA·h/g. Compared with other iron-based compound, it is nontoxic and has good thermal stability in fully charged state and little hygroscopicity. So it has attracted particular interest. In this paper, LiFePO_4 was prepared by solid-state reaction. The ratio of Li to Fe and sintering time were assessed. When the ratio of Li to Fe was 1.05:1, sintering time was 24h, the prepared LiFePO_4 had good electrochemical performance with initial specific capacity of 140.4 mA·h/g.