期刊
ELECTROCHIMICA ACTA
卷 271, 期 -, 页码 242-251出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2018.03.144
关键词
Cobalt sulfide; Electroplating; Doped carbon; Capacitive behavior; Lithium-ion battery
资金
- National Natural Science Foundation of China [21471056, 21676093, 91534202, 21776092]
- Basic Research Program of Shanghai [15JC1401300, 17JC1402300]
- Social Development Program of Shanghai [17DZ1200900]
- Innovation Program of Shanghai Municipal Education Commission
- Fundamental Research Funds for the Central Universities [222201718002]
The mass production of the sixth generation flexible cell phone screen is boosting the demand for flexible lithium ion batteries with high energy density and longer lifetime. CoS with high theoretical capacity and graphene foams with excellent flexibility can be candidates. In this work, CoS nanosheets are synthesized by electrodeposition and sulfuration. For the first time, free-standing porous CoS nanosheets supported on graphene foams with N and S doped carbon shells are synthesized by carbonization and sulfuration of polydopamine, which enhances conductivity. With controllable precursors, three types of morphologies were obtained and the influences of void spaces, carbon shells and the inner pores are studied. The void space and porous structure of CoS nanosheets can benefit the lithium ion diffusion and rate capability while the void space and conformal carbon shells can improve the stability of electrodes and long cycling performances. By combining the advantages of void spaces, shells and porous nanosheet structures, a high cyclic capacity of 481.7 mA h g(-1) is delivered, evaluated by the overall weight of the electrode at 0.1C (1C = 600 mA h g(-1)) after 100 cycles and good rate capability. (C) 2018 Elsevier Ltd. All rights reserved.
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