Journal
ELECTROCHIMICA ACTA
Volume 260, Issue -, Pages 830-837Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2017.12.048
Keywords
Lithium ion batteries; Si-Mn/C anode; Inactive Mn4Si7 alloy; Electrochemical performance
Categories
Funding
- National Natural Science Foundation of China [21373008, 21621091]
- National Key Research and Development of China [2016YFB0100202]
- Natural Science Foundation of Fujian Province of China [2015J01063]
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Inactive silicon-metal phase as addition agent of silicon-based anode materials for lithium ion batteries can effectively improve the battery electrochemical performance. Si-Mn/C composites composed of Si, Mn4Si7 alloy and amorphous carbon, were synthesized by a liquid solidification method with subsequent heating treatment. The obtained 90%Si10%Mn/C composite as the electrode displays a good cyclabiltiy with a capacity retention of 82.3% after 100 cycles and an excellent rate capability with a high capacity of 880.6 mAh g(-1) even at a high rate of 13 A g(-1). The outstanding performance of 90%Si10%Mn/C electrode is attributed to the inactive Mn4Si7 alloy in the composites, which mainly distribute in between nano-silicon particles or on the surface of nano-silicon, to build up a connection between nano-silicon particles and enhance the stability of both electrode material structure and electrode/electrolyte interface. We believe that integrating inactive Mn4Si7 alloy may open a sacred door for the large-scale production silicon-based anode materials. (C) 2017 Elsevier Ltd. All rights reserved.
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