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中南大学学报(英文版)

Journal of Central South University

Vol. 21    No. 5    May 2014

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TiO2/graphene nanocomposites as anode materials for high rate lithium-ion batteries
TANG Yi-ping(唐谊平), WANG Shi-ming(王诗明), TAN Xiao-xu(谭晓旭), HOU Guang-ya(侯广亚), ZHENG Guo-qu(郑国渠)

College of Chemical Engineering and Material Science, Zhejiang University of Technology, Hangzhou 310014, China

Abstract:A simple strategy to prepare a hybrid of nanocomposites of anatase TiO2/graphene nanosheets (GNS) as anode materials for lithium-ion batteries was reported. The morphology and crystal structure were studied by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM). The electrochemical performance was evaluated by galvanostatic charge–discharge tests and alternating current (AC) impedance spectroscopy. The results show that the TiO2/GNS electrode exhibit higher electrochemical performance than that of TiO2 electrode regardless of the rate. Even at 500 mA/g, the capacity of TiO2/GNS is 120.3 mAh/g, which is higher than that of TiO2 61.6 mAh/g. The high performance is attributed to the addition of graphene to improve electrical conductivity and reduce polarization.

 

Key words: TiO2; graphene nanosheets; lithium-ion batteries; anode materials

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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