掺钒尖晶石型LiV_xMn_(2-x)O_4的合成和性能

Synthesis and Properties of Vanadium-doped Spinel LiV_xMn_(2-x)O_4

采用低温液相合成了锂离子二次电池正极材料LiVxMn2-xO4。X-射线衍射测试表明,添加了适量钒的LiVxMn2-xO4具有尖晶石型结构。循环伏安实验证实,钒的加入能促进活性材料中电荷传递,稳定尖晶石的结构,使电极材料更能承受锂离子在其中的嵌入和脱出。因此,改善了电极反应的可逆性,提高了正极材料的电化学性能。恒电流充放电实验进一步证明,钒能改善合成材料循环性能,抑制电池循环过程中,正极活性物质的比容量衰减,延长了电池的循环寿命。

A method of preparing the spinel LiV_(x)Mn_(2-x)O_(4) with liquid phaseis introduced at a low temperature. With cyclic voltammogram and discharge-charge tests at content current, we find that the doped vanadium leads to the spinel structure more stable, the reversible behaviors of LiV_(x)Mn_(2-x)O_(4)is improved, and the capacity fade on cycling is reduced.The cycle life of the battery based on LiV_(x)Mn_(2-x)O_(4)is also found improved.