期刊
ELECTROCHIMICA ACTA
卷 54, 期 13, 页码 3606-3610出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2009.01.030
关键词
Tin sulfide; Solvothermal synthesis; Carbon coating; Lithium-ion battery
资金
- Division of Advanced Batteries in the NGE [10028960-2007-11]
Carbon-coated SnS2 nanoparticles were prepared by a simple solvothermal route at low temperature. A carbon coating with a thickness of about 5 nm was deposited on nano-sized SnS2 particles to serve as the anode in lithium-ion batteries. Both the nanostructure and the morphology of the SnS2 powders were characterized by X-ray diffraction (XRD), Raman spectroscopy, and transmission electron microscopy (TEM). The coated samples were used as active anode materials for lithium-ion batteries, and their electrochemical properties were examined by constant current charge-discharge cycling, cyclic voltammetry and electrochemical impedance spectroscopy. The reversible capacity of the carbon-coated SnS2 after 50 cycles was 668 mAh/g, which was much higher than that of the uncoated SnS2 (293 mAh/g). The carbon-coated SnS2 also had a better rate capability than the uncoated SnS2 in the range of 0.008-1 C. The capacity retention of the carbon-coated SnS2 was improved due to its good conductivity and the effective buffer matrix that alleviated volume expansion during the charge-discharge process. (C) 2009 Elsevier Ltd. All rights reserved.
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