Acta Phys. -Chim. Sin. ›› 2014, Vol. 30 ›› Issue (7): 1281-1289.doi: 10.3866/PKU.WHXB201405071

• ELECTROCHEMISTRY AND NEW ENERGY • Previous Articles     Next Articles

Synthesis and Properties of FeSn2-C Composites as Anode Materials for Lithium-Ion Batteries

LIU Xin1, XIE Jing-Ying2, ZHAO Hai-Lei1,3, LÜ Peng-Peng1, WANG Ke2, FENG Zhen-He2, WANG Meng-Wei2   

  1. 1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, P. R. China;
    2. Shanghai Institute of Space Power Sources, Shanghai 200245, P. R. China;
    3. Beijing Key Laboratory of New Energy Materials and Technology, Beijing 100083, P. R. China
  • Received:2014-02-10 Revised:2014-05-07 Published:2014-06-30
  • Contact: XIE Jing-Ying, ZHAO Hai-Lei E-mail:xiejingying2007@126.com;hlzhao@ustb.edu.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (21273019), National Key Basic Research Program of China (973) (2013CB934003), National High Technology Research and Development Program of China (863) (2013AA050902), Shanghai Science and Technology Talent Project Funds, Chian (12XD1421900), and Shanghai Science and Technology Development Funds, China (12dz1200503, 13dz2280200).

Abstract:

Tin has a theoretical specific capacity as high as 990 mAh·g-1, and is thus a potential anode material for high-energy-density lithium-ion batteries. However, it suffers from a huge volume change during lithiation/delithiation process, leading to poor cycle performance. In this paper, core/shell structured FeSn2-C composites were successfully synthesized by a simple high-energy ball milling technique with Sn, Fe, and graphite powder as raw materials. The FeSn2-C composite was evaluated as an anode material for lithium-ion batteries. The influence of milling time and final phase composition on the microstructure and electrochemical performance of FeSn2-C composites was systematically investigated. The failure mechanism of the FeSn2-C electrode was also analyzed. The results reveal that long milling time can promote the mechanical alloying process of the FeSn2 phase and reduce the particle size of the FeSn2-C composite, which are beneficial for the increase of the specific capacity and the improvement of the cycle performance of the FeSn2-C electrode. A high FeSn2 phase content leads to a high specific capacity of the FeSn2-C composites but poor cycling stability of the electrode. The optimized Sn20Fe10C70 composite prepared by ball milling for 24 h (500 r ·min-1) shows the best electrochemical performance with a capacity about 540 mAh·g-1 for 100 cycles. The synthesized Sn20Fe10C70 composite is a promising anode material for highenergy-density lithium-ion batteries.

Key words: FeSn2-C composite, Phase composition, High-energy ball milling, Anode material, Lithium-ion battery

MSC2000: 

  • O646