四元尖晶石相Li-M-Mn-O(M=Ni,Cr,Mo,V)嵌入电极的研究

The Study of Quaternary Spinel Phase Li - M - Mn - O (M = Ni,Cr,Mo,V) Cathode

制备了用不同价态的几种金属阳离子(Ni^(2+),Cr^(3+),V^(5+),Mo^(6+))修饰的尖晶石LIMn_2O_4嵌入化合物作为锂二次电池的阴极材料,对Li/LiM_rMn_(2-y)O_4电池进行了电化学和X射线衍射研究.结果表明,其它离子的掺杂使标准尖晶石LiMn_2O_4电极对锂的反复脱嵌和嵌入有了更强的承受力,但在不同程度上降低了其初始容量.循环性能的提高归于掺杂的金属阳离子使尖晶石结构趋于更稳定.同时还讨论了修饰离子对尖晶石相在充放电时5V电压平台出现的影响.

The quaternary spinel compounds LiMyMn2-yO4(M = Ni, Cr, Mo, V) were prepared as the cathode material of 4V lithium secondary batteries. X - ray diffraction and electrochemical studies were carried out using the Li/LixM0.1Mn1.9O4 cells.The results show that these cathodes were more tolerant to repeated lithium extraction and insertion at the expense of some initial capacity. The improvement in cycling performance is attributed to the stabilization in the spinel structure by the doped metal cations. The performance of LiM0.1Mn1.9O4 in 5V range is also discussed.