摘要
A Si/MgO composite anode material was prepared by a simple magnesium reduction process using silicon oxide and magnesium as starting reactants. The feasibility of this process is discussed from the thermodynamic viewpoint. The resultant composite material is mainly com- posed of Si and MgO components. MgO, acting as a buffer layer, can accommodate the large volume change of active Si during the charge/discharge process, thus the cycling stability is improved. Electrochemical tests demonstrate that the first charge and discharge capaci- ties of the synthesized Si/MgO composite anode are ca. 1380 and 1046 mAh.g-1, respectively, with an initial coulomb efficiency of ca. 76%. The magnesium reduction process provides a novel idea for the synthesis of Si-based anode materials.
A Si/MgO composite anode material was prepared by a simple magnesium reduction process using silicon oxide and magnesium as starting reactants. The feasibility of this process is discussed from the thermodynamic viewpoint. The resultant composite material is mainly com- posed of Si and MgO components. MgO, acting as a buffer layer, can accommodate the large volume change of active Si during the charge/discharge process, thus the cycling stability is improved. Electrochemical tests demonstrate that the first charge and discharge capaci- ties of the synthesized Si/MgO composite anode are ca. 1380 and 1046 mAh.g-1, respectively, with an initial coulomb efficiency of ca. 76%. The magnesium reduction process provides a novel idea for the synthesis of Si-based anode materials.
基金
supported by the National High-Tech Research and Development Program of China(No. 2006AA03Z231)
the Program for New Century Excellent Talents in Chinese Universities (No. NCET-07-0072)
the Program for Guangdong Industry-Academy-Alliance Research (No. 2009A090100020)
