期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 566, 期 -, 页码 1-10出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2020.01.068
关键词
Cobalt doping; Metal-organic frameworks; Two-dimensional structure; Ultrathin nanosheet; Copper sulfides; Lithium-ion batteries
资金
- State Key Laboratory of Refractories and Metallurgy in Wuhan University of Science and Technology [G201709]
- China Postdoctoral Science Foundation [2018M640337, 20197120304]
- Fudan's Undergraduate Research Opportunities Program (FDUROP) [18060]
Construction of well-defined hybrid composites consisting of transition metal sulfides and two-dimensional (2D) carbon nanosheets as high-performance anodes for lithium-ion batteries (LIBs) is of great significance but remains challenging. Herein, we have developed a novel strategy to in situ fabricate a nanohybrid composites consisting of cobalt-doped copper sulfides nanoparticles embedded in 2D carbon nanosheets (2D Co-Cu2S@C) through a one-pot sulfurization of 2D nanosheet-like Co-doped copperbased metal-organic frameworks (MOFs) precursors. When applied as LIBs anodes, the as-prepared 2D Co-Cu2S@C composites could deliver a specific capacity of 780 mAh g(-1) at 0.5 A g(-1) after 300 cycles and a high-rate capability with 209 mAh g(-1), at 5 A g(-1), superior to most reported copper sulfidebased anodes. The exceptional performance could be attributed to the synergism of ultrathin structure (similar to 4 nm), appropriate cobalt doping and strong carbon coupling, resulting in the shortened paths for Li+ transportation, enlarged exposing surface for Li+ adsorption, enhanced electric conductivity for charge transfer as well as robust mechanical property against volume expansion. (C) 2020 Elsevier Inc. All rights reserved.
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