Journal
ELECTROCHIMICA ACTA
Volume 58, Issue -, Pages 44-51Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2011.08.075
Keywords
Lithium batteries; Anode materials; Sn/carbon composites; Electrospinning
Categories
Funding
- Natural Science Foundation of Jiangsu Province of China [BK2010262]
- Natural Science Foundation of Jiangsu Educational Department of China [10KJA480001, 09KJD150001]
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By using electrospinning and carbonization, tin nanoparticles enwrapped in carbon nano-fibers (Sn/C) present high capacity and well cyclic performance. The precursor compositions of SnCl2 and polyacrylonitrile (SnCl2/PAN) have a significant effect on the crystal structure, morphology of Sn/C composites, and the electrochemical performance. Along with the increased concentration of tin in the precursors of SnCl2/PAN, the diameters of the carbonized Sn/C nanofibers are decreased. The samples of SnCl2/PAN with starting weight ratio 3:2 (Sn3Pan2), 1:1 (Sn1Pan1) and 2:3 (Sn2Pan3) present the initial discharge capacity 977.8. 1329.8, and 1137.0 mAh g(-1), respectively. In the following cycles, the Sn/C nanofibers present high capacity and well cyclic performance. The sample Sn1Pan1 retains a charge capacity of 741.1 mAh g(-1) (92% of the initial charge capacity) after 40 cycles. Because the nanoparticles of tin metal are enwrapped in carbon nanofibers, the volume change and aggregation of metal anode are decreased during charging and discharging processes. (C) 2011 Elsevier Ltd. All rights reserved.
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