S-Co复合掺杂LiMn2O4的合成与性能

为了扩大锂离子电池正极材料Li_xMn₂O₄的工作电压范围,在保证良好循环性能的基础上提高材料的容量,本文对S-Co复合掺杂LiMn₂O₄的合成工艺和电化学性能进行了研究。溶胶-凝胶法合成的各试样均为纯的立方尖晶石相,且结晶状态良好。S-Co复合掺杂综合了S掺杂效应和Co掺杂效应,改善了LiMn₂O₄的电化学性能,在2.4～4.3V充放电压范围内,初始容量较高,达到170mAh/g,30次循环后容量不但没有衰减而且有一定增加。

Synthesis and Performance of S-Co Co-doped LiMn2O4

To extend the charge/discharge voltage range of cathode material Li_xMn₂O₄ for Li-ion battery and elevate it’s capacity on the basis of good cyclability, the synthesis and electrochemical performance of S-Co co-doped LiMn₂O₄ were researched. All the samples synthesized by the sol-gel method possess the structure of the pure cubic spinel phase and the crystallization is superior. The electrochemical performance of LiCo_0.1Mn_1.9O_4-xS__x is satisfying too. In voltage range of 2.4--4.3V, the initial capacity amounts to 170 mAh/g and it increases to some extent instead of decreasing after 30 cycles.