锂离子电池阴极材料LiMn2－xZrxO4的性能表征

采用高温固相法合成了掺杂改性的尖晶石型LiMn2－xZrxO4 (x= 0, 0.01, 0.02, 0.04, 0.06, 0.08, 0.10)作为锂离子电池阴极材料.通过X射线衍射和环境扫描电镜对材料的晶体结构和形貌进行了表征.从材料的晶体结构、恒流充放电测试和循环性能等方面分析了掺杂元素Zr在改善材料性能中的作用.实验表明,当Zr的掺杂量在x ≤ 0.06时,材料在保持较高容量的同时,循环性能得到了明显改善.其中LiMn1.98Zr0.02O4的性能最佳,50次循环后容量仍在113.8 mA?h?g－1以上.

Characterizations of Spinel LiMn2-xZrxO4 Cathode for Lithium-ion Batteries

Modified spinel lithium manganate with zirconium doped LiMn2－xZrxO4 (x= 0, 0.01, 0.02, 0.04, 0.06, 0.08, 0.10) used for cathode of lithium-ion batteries was prepared by solid-state method. The structure and morphology of as-prepared cathode materials were characterized by XRD and ESEM (environment scanning electron micrograph). The effects of the zirconium doping on improving the performances of spinel materials were analyzed in terms of the crystal structure, charge-discharge curves and cycle performances. The results showed that the modified materials had better cycle performances without significant degradation of capacity when the doping value x was less than 0.06,and LiMn1.98Zr0.02O4 was the best compound with a capacity of 113.8 mA?h?g－1 after 50 cycles.