Acta Phys. -Chim. Sin. ›› 2012, Vol. 28 ›› Issue (02): 338-342.doi: 10.3866/PKU.WHXB201111242

• ELECTROCHEMISTRY AND NEW ENERGY • Previous Articles     Next Articles

Effect of Doping with Ti4+ Ion on the Electrochemical Performance of LiFe0.6Mn0.4PO4/C

GAO Ping1,2, TAN Zhuo1,2, CHENG Fu-Quan2, ZHOU Heng-Hui2, TAN Song-Ting1   

  1. 1. College of Chemistry, Xiangtan University, Xiangtan 411105, Hunan Province, P. R. China;
    2. College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China
  • Received:2011-09-13 Revised:2011-11-17 Published:2012-01-11
  • Contact: ZHOU Heng-Hui, TAN Song-Ting E-mail:hhzhou@pku.edu.cn; tanst2008@163.com
  • Supported by:

    The project was supported by the National High-Tech Research and Development Program of China (863) (2009AA035200).

Abstract: Ti-doped LiFe0.6Mn0.4PO4/C materials were synthesized by a solid-state method. The structures, morphologies, and electrochemical performance of the materials were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and galvanostatic charge-discharge experiments. The results indicate that Ti4+ doping does not change the structure of the materials, but remarkably improves their electrochemical performance. Li(Fe0.6Mn0.4)0.96Ti0.02PO4/C shows excellent rate performance, with initial specific discharge capacities of 160.3 and 134.7 mAh·g-1 at 0.1C and 10C rates. Even at the higher rate of 20C, it shows a discharge capacity of 124.4 mAh·g-1. Electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV) analyses show that the resistance and the polarization of the LiFe0.6Mn0.4PO4/C composite electrode could be effectively decreased by Ti4+ doping, which would account for the improved electrode performance.

Key words: Lithium-ion battery, LiFe1-xMnxPO4, Cathode material, Ion doping, Rate capacity

MSC2000: 

  • O646