Electrochemical behavior of carbon-coated SnS2 for use as the anode in lithium-ion batteries
Electrochemical behavior of carbon-coated SnS2 for use as the anode in lithium-ion batteries
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DOI：
10.1016/j.electacta.2009.01.030
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发表时间：
2009-05-01
影响因子：
6.6
通讯作者：
Sung, Yung-Eun
中科院分区：
文献类型：
--
作者：
Kim, Hyun Sik;Chung, Young Hoon;Sung, Yung-Eun
采用简单的溶剂热法在低温下制备了碳包覆的SnS 2纳米粒子。在纳米尺寸的SnS 2颗粒上沉积厚度为约5 nm的碳涂层，以用作锂离子电池中的阳极。采用X射线衍射（XRD）、拉曼光谱和透射电子显微镜（TEM）对SnS 2粉体的形貌和纳米结构进行了表征。采用恒电流充放电循环、循环伏安和电化学阻抗谱等测试手段对涂层样品的电化学性能进行了研究。碳包覆的SnS 2在50次循环后的可逆容量为668 mAh/g，这远高于未包覆的SnS 2的可逆容量（293 mAh/g）。在0.008- 1C范围内，碳涂覆的SnS 2也具有比未涂覆的SnS 2更好的倍率性能。碳包覆的SnS 2由于其良好的导电性和有效的缓冲基质，在充电-放电过程中，减轻体积膨胀的容量保持率提高。(C)2009爱思唯尔有限公司保留所有权利。
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.