钠锰比对NaxMnO2的性能和钠离子脱嵌过程的影响
1. 广西大学化学化工学院，广西 南宁 530004；2. 广西高校新能源材料及相关技术重点实验室，广西 南宁 530004；3. 广西新型电池材料工程技术研究中心，广西 南宁 530004；4. 广西有色金属及特色材料加工重点实验室，广西 南宁 530004
收稿日期: 2018-02-07
修回日期: 2018-03-26
网络出版日期: 2018-04-25
基金资助
国家自然科学基金资助项目(No. 51564002)资助
Influences of Na-Mn Ratio on Electrochemical Performances and Intercalation-Deintercalation Processes of Sodium Ion in NaxMnO2
1. School of Chemistry of and Chemical Engineering, Guangxi University, Nanning 530004, China;2. Guangxi Key Laboratory of Processing for Non-ferrous Metallic and Featured Materials, Guangxi University, Nanning 530004, China; 3. Guangxi Novel Battery Materials Research Center of Engineering Technology, Nanning 530004, China; 4. Guangxi Colleges and Universities Key Laboratory of Novel Energy Materials and Related Technology, Nanning 530004, China
Received date: 2018-02-07
Revised date: 2018-03-26
Online published: 2018-04-25
Supported by
The National Natural Science Fund(No. 51564002)
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.
谢永纯 , 王成 , 蒋芳 , 杨洋 , 苏静 , 龙云飞 , 文衍宣 . 钠锰比对NaxMnO2的性能和钠离子脱嵌过程的影响[J]. 电化学, 2018 , 24(4) : 375 -384 . DOI: 10.13208/j.electrochem.180207
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