期刊
JOURNAL OF POWER SOURCES
卷 439, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2019.227112
关键词
Lithium-ion battery; MoSe2-CoSe2; Graphene aerogel; Nitrogen doping; Porous structure
资金
- National Natural Science Foundation of China [51873037, 51503038]
- Scientific and Technological Innovation Project of Fujian Province [2012H6008]
- Scientific and Technological Innovation Project of Fuzhou City [2013-G-92]
Bimetallic transition-metal selenides have emerged as promising anode materials for lithium-ion batteries (LIBs). However, they suffer from rapid capacity fading which is originated from significant chemical and mechanical degradation during lithiation/delithiation processes. Herein, nitrogen-doped graphene aerogel (NGA) with high porosity is prepared via a templated method and serves as the matrix for the uniform growth of sheet-like binary transition-metal selenides (MoSe2-CoSe2). The porous NGA with high specific surface area provides a stable and conductive network, which can accelerate electron transmission and shorten the diffusion distance of Li ions. Furthermore, the MoSe2-CoSe2 nanosheets can offer adequate specific capacity because of its high accessibility and multiple redox properties. As a result, the MoSe2-CoSe2/NGA-10 composite delivers high Li-ion storage capacity (1260 mAh g(-1) at 0.1 A g(-1)), excellent rate capability (702 mAh g(-1) at 5 A g(-1)), and stable cycling performance (914 mAh g(-1) at 1 A g(-1) after 200 cycles), demonstrating its great potential for LIB applications.
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