Mg掺杂对钴酸锂性能的影响研究

The Effects of Mg Doping on the Performance of Lithium Cobalt Oxide

摘要: 采用高温固相法合成了掺杂Mg的钴酸锂材料，研究了Mg掺杂量对钴酸锂结构、形貌以及电性能的影响。结果表明，掺Mg后的钴酸锂样品电化学性能得到改善。当Mg掺杂量为0.25%时，钴酸锂样品的综合性能表现最好，当充放电电压范围为3~4.4V时，在0.1C倍率下钴酸锂样品的初始放电容量高达168.5 mAh/g，1C循环100次容量保持率为87.5%。

Abstract: LiCoO₂ doped with Mg was synthesized by solid-state method. The effects of Mg dopant content on structure, micro-morphology and electrical properties of LiCoO₂ were investigated. The modified LiCoO₂ composite exhibits the better electrical properties. The results show that LiCoO₂ gives the best combined properties as the Mg dopant content is 0.25%. The initial discharge capacity of the LiCoO₂ is as high as 168.5 mAh/g at 0.1C in the voltage range of 3 - 4.4 V and the capacity retention achieves 87.5% after 100 cycles at 1C in the voltage range of 3 - 4.4 V.