Journal
CHEMISTRYSELECT
Volume 2, Issue 35, Pages 11739-11746Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/slct.201702062
Keywords
sodium-ion battery; anode material; initial coulombic efficiency; metal Sn
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Theoretically, metal Sn owns higher initial coulombic efficiency than SnO2 in the sodium-ion batteries (SIBs). Metal Sn is commonly obtained by the thermal reduction of SnO2 at present. However, the uncontrollable growth of metal Sn particles during the reduction progress is a key challenge. In this work, a composite material of refined metal Sn particles (particle size about 20-200 nm) and carbon buffer medium has been prepared by a novel method, which is simple thermal reduction adopted after the treatment of SnO2/RGO in the pitch kerosene solution. The results show that this method overcomes the uncontrollable growth of metal Sn particles. Electrochemical tests show that C/Sn/RGO possesses a higher initial reversible capacity of 476.2 mAh g(-1), and a higher initial coulombic efficiency of 70.3%. This method would have wider applications for the attractive properties of Na-ion batteries in the future.
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