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- 2018
钠锰比对NaxMnO2的性能和钠离子脱嵌过程的影响
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Abstract:
摘要 采用高温固相法合成了NaxMnO2，并用X-射线衍射、X-射线光电子能谱、场发射扫描电镜、循环伏安、电化学阻抗谱和恒流充放电技术研究了钠锰比对材料的形态结构、电化学性能和钠离子脱嵌过程的影响. 结果表明，NaxMnO2 主要由Na0.7MnO2 和Na0.91MnO2 组成，且Na0.91MnO2 的量随着钠锰比的增加而增加. 随着钠锰比的增加，SEI 膜扩散、界面电化学反应和固相扩散的活化能先减少后增大，而材料的放电比容量则先增大后减少. 当钠锰比为0.80 时，合成的材料1C 倍率下首次放电比容量为152.8 mAh·g-1，50 次循环容量保持率为80.6%，5C 大倍率下放电比容量为88.3 mAh·g-1，表现出了良好的循环性能和倍率性，相应的SEI 膜扩散、界面电化学反应和固相扩散过程的活化能分别为68.23、40.07 和57.62 KJ·mol-1
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