期刊
ELECTROCHIMICA ACTA
卷 56, 期 13, 页码 4812-4818出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2011.03.006
关键词
Intermetallic compounds; Carbothermal reduction; Hydrophobic powders; Lithium-ion battery
资金
- National Natural Science Foundation of China [20925312]
- State Key Basic Research Program of PRC [2007CB209703, 2011CB935903]
- Shanghai Science and Technology Committee [09XD1400300, 10JC1401500, 08DZ2270500]
Stannate, CoSnO3, which mixes the elements Co and Sn evenly at the atomic level, was used as precursor to prepare CoSnC by a modified carbothermal reduction method. The synthesis process was characterized by differential thermal analysis (DTA) and X-ray diffraction (XRD). The particle feature was evaluated by transmission electron microscopy (TEM). The results indicated the as-prepared composite has a well-coated carbon layer that effectively prevents the encapsulated, low melting point alloy from out-flowing in a high-temperature treatment process. In addition, this structure. CoSnx grains surrounded by carbon, prevents aggregation and pulverization of nanosized, tin-based alloy particles during charge/discharge cycling and improves the cycling stability of the alloy. The synthesized CoSnC integrates the merits of intermetallic compounds and nanosized anode materials and delivers a reversible capacity of 450 mA h g(-1) with a capacity retention of 72% after 50 cycles. (C) 2011 Elsevier Ltd. All rights reserved.
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