Journal of Inorganic Materials

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High Capacity SiAl/C Anode Material for Lithium-ion Batteries

WEN Zhong-Sheng1, XIE Xiao-Hua2, WANG Ke1, YANG Jun1, XIE Jing-Ying1   

  1. 1. Laboratory of Energy Science and Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of
    Sciences, Shanghai 200050, China; 2. Chemical Engineering School, Harbin Engineering University, Harbin 150001, China
  • Received:2003-12-23 Revised:2004-02-18 Published:2005-01-20 Online:2005-01-20

Abstract: High capacity anode material SiAl/C composite was prepared by thermal annealing process. Its structure was characterized by XRD and its cyclability and potentiostatic
cycling performance were investigated. The charging and discharging test shows SiAl/C composite possesses higher capacity than carbonaceous
mesophase spherules. And its first irreversible capacity is decreased, comparing with Si/C composite prepared under the same conditions.
It is demonstrated that by adding Al into Si/C composite system, its first Li+ insertion depth is suppressed and voltage hysteresis is alleviated.
Obtained SiAl/C composite anode material has a capacity about 600mAh/g for its first Li+ insertion and its coulombic efficiency for the first cycle
is up to 85%. And after 25 cycles, its capacity retention can be retained about 90%.

Key words: lithium-ion batteries, anode, composite material, silicon

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