期刊
NANO RESEARCH
卷 9, 期 10, 页码 3162-3170出版社
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-016-1198-3
关键词
metal sulfides; sodium-ion batteries; composite; carbon coating layer; cycling stability
类别
资金
- National Natural Science Foundation of China [51472173, 51522208]
- Natural Science Foundation of Jiangsu Province [BK20140302, SBK2015010320]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- Collaborative Innovation Center of Suzhou Nano Science and Technology
Nanostructured metal sulfides are potential electrode materials for sodium-ion batteries; however, they typically suffer from very poor cycling stability due to large volume changes and dissolution of discharge products. Herein we propose a rational material design strategy for sulfide-based materials to address these problems. Taking nickel sulfide (NiS (x) ) as an example, we demonstrated that its electrochemical performance can be dramatically improved by confining the NiSx nanoparticles in a percolating conductive carbon nanotube network, and stabilizing them with an ultrathin carbon coating layer. The carbon layer serves as a physical barrier to alleviate the effects of both the volume change and dissolution of active materials. The hybrid material exhibited a large reversible specific capacity of > 500 mAh/g and excellent cycling stability over 200 cycles. Given the traditionally problematic nature of NiS (x) as a battery anode material, we believe that the observed high performance reported here reflects the effectiveness of our material design strategy.
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