A team from Shanghai University (China) synthesized graphene nanosheet (GNS)-supported Fe2O3 nanorice and nanoparticles for use as an anode material for Li-ion batteries. As reported in ACS’s Journal of Physical Chemistry C, the material exhibits a very large reversible capacity of 1,184 mAh/g at a small current of 100 mA/g as well as good cycling performances.
The Fe2O3-GNS rice-on-sheet composite also exhibited large capacities of 825 and 633 mAh/g at large currents of 1000 and 5000 mA/g, respectively. The researchers ascribed the strong electrochemical behavior to the increased electrical conductivity and mechanical stability of Fe2O3 nanorice by GNS support and the prevented aggregation of few-layer GNS by the Fe2O3 decoration during the repetitive cycling with lithium ions.
The improved electrochemical properties have been ascribed to the synergetic effect between two components of the Fe2O3-GNS composite. The electrical conductivity and mechanical stability of Fe2O3 nanorice was improved by GNS, and GNSs were separated and stabilized by the Fe2O3 nanorice decoration; therefore, the intriguing features of few-layer GNS could be preserved during long-time cycling.—Zou et al.
Yuqin Zou, Jin Kan and Yong Wang (2011) Fe2O3-Graphene Rice-on-Sheet Nanocomposite for High and Fast Lithium Ion Storage. The Journal of Physical Chemistry C DOI: 10.1021/jp206876t