Journal
RARE METALS
Volume 30, Issue 2, Pages 166-169Publisher
NONFERROUS METALS SOC CHINA
DOI: 10.1007/s12598-011-0218-4
Keywords
lithium batteries; anode materials; magnesia; silicon; electrochemical properties
Funding
- National High-Tech Research and Development Program of China [2006AA03Z231]
- Program for New Century Excellent Talents in Chinese Universities [NCET-07-0072]
- Program for Guangdong Industry-Academy-Alliance Research [2009A090100020]
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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 composed 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 capacities 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.
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