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ACS Nano. 2017 Oct 24;11(10):10347-10356. doi: 10.1021/acsnano.7b05294. Epub 2017 Sep 19.

Self-Assembled Cu-Sn-S Nanotubes with High (De)Lithiation Performance.

Author information

1
Pen-Tung Sah Micro-Nano Science and Technology Institute, Xiamen University , Xiamen, Fujian 361005, China.
2
Department of Chemical Engineering and Department of Chemistry, Center for Electrochemistry, University of Texas at Austin , Austin, Texas 78712-0231, United States.
3
Department of Chemistry and the Institute for Computational Engineering and Sciences, University of Texas at Austin , Austin, Texas 78712-0165, United States.
4
Department of Chemical Engineering, Kangwon National University , Chuncheon, Gangwon-do 24341, South Korea.
5
College of Chemistry and Chemical Engineering, Central South University , Changsha, Hunan 410083, China.
6
Texas Materials Institute, University of Texas at Austin , Austin, Texas 78712-1591, United States.

Abstract

Through a gelation-solvothermal method without heteroadditives, Cu-Sn-S composites self-assemble to form nanotubes, sub-nanotubes, and nanoparticles. The nanotubes with a Cu3-4SnS4 core and Cu2SnS3 shell can tolerate long cycles of expansion/contraction upon lithiation/delithiation, retaining a charge capacity of 774 mAh g-1 after 200 cycles with a high initial Coulombic efficiency of 82.5%. The importance of the Cu component for mitigation of the volume expansion and structural evolution upon lithiation is informed by density functional theory calculations. The self-generated template and calculated results can inspire the design of analogous Cu-M-S (M = metal) nanotubes for lithium batteries or other energy storage systems.

KEYWORDS:

copper tin sulfide; core−shell; density functional theory; gelation−solvothermal; lithium battery; nanotube

PMID:
28898580
DOI:
10.1021/acsnano.7b05294

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