碳纳米管的微观结构调节对锂空气电池电化学行为的影响

王海帆; 魏伟; 秦磊; 雷宇; 余唯; 刘如亮; 吕伟; 翟登云; 杨全红

碳纳米管的微观结构调节对锂空气电池电化学行为的影响

王海帆^1,2,
魏伟³,
秦磊¹,
雷宇¹,
余唯¹,
刘如亮¹,
吕伟^1,,
翟登云¹,
杨全红¹

1.
清华大学深圳研究生院下一代动力与储能电池和炭功能材料工程实验室, 广东深圳 518055;
2.
清华大学材料学院, 北京 100084;
3.
中国科学院大连化学物理研究所洁净能源国家实验室燃料电池研究部, 辽宁大连 116023

基金项目: 国家重点基础研究发展计划(2014CB932400);国家自然科学基金(U1401243,21506212);深圳市基础研究计划(ZDSYS20140509172959981,JCYJ20150529164918734).

详细信息

作者简介:
王海帆,硕士研究生.E-mail:461730912@qq.com

通讯作者:
吕伟,博士.E-mail:lv.wei@sz.tsignhua.edu.cn;翟登云,博士.E-mail:aiai1588@gmail.com

中图分类号: TQ127.1⁺1
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出版历程
- 收稿日期: 2016-05-05
- 录用日期: 2016-06-28
- 修回日期: 2016-06-01
- 刊出日期: 2016-06-28

Influence of the KOH activation of carbon nanotubes on their electrochemical behavior in lithium-air batteries

1.
Engineering Laboratory for Next Generation Power and Energy Storage Batteries, Engineering Laboratory for Functionalized Carbon Materials, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China;
2.
Laboratory of Advanced Materials, School of Materials, Tsinghua University, Beijing 100084, China;
3.
Division of Fuel Cell & Battery, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China

Funds: National Basic Research Program of China (2014CB932400);National Natural Science Foundation of China (U1401243, 21506212);Shenzhen Basic Research Project (ZDSYS20140509172959981, JCYJ20150529164918734).

摘要

摘要: 锂空气电池的理论能量密度约是锂离子电池的10倍,因而受到研究者的广泛关注。碳质材料由于其稳定的结构和良好的导电性,目前仍作为锂空气电池的主要正极材料。通过KOH活化调节碳纳米管的表面特性和微观结构,将其作为锂空气电池正极材料,研究碳纳米管的微观结构变化对放电产物及电化学行为的影响。结果表明,当碳纳米管管壁被剥开导致大量边界原子外露,形成碳纳米管-石墨烯杂化结构,极大提高了碳纳米管正极的反应活性,放电容量和循环性能显著增加,放电产物分布均匀及颗粒减小,充电平台也显著降低。
- 锂空气电池 /
- 碳纳米管 /
- 过氧化锂 /
- 表面结构
Abstract: The Li-air battery has attracted considerable attention owing to its high energy density, which is approximately 10 times larger than that of a conventional Li-ion battery. Carbon is frequently used as the cathode material because of its stable structure and excellent conductivity. The surface properties and microstructure of carbon nanotubes (CNTs) were modified by KOH activation and its effects on the electrochemical behaviorof CNTs as a cathode material for Li-air batterieswere investigated. Results indicate that the graphitic layer of the CNT outer surface is etched and more edge carbon atoms are exposed after the modification, which generates a CNT-graphene hybrid nanostructure. This hybrid structure provides a large number of active sites that are beneficial for the generation/decomposition of discharge products, leading to a decrease of the charging overpotential and an improvement in cycling stability.
- Lithium-air batteries /
- Carbon nanotube /
- Lithium peroxide /
- All-carbon electrodes

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