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Preparation and characterization of positive materials LiMn1-xFexPO4(0x<1) for lithium ion batteries

Yue Min Hu She-Jun Hou Xian-Hua Liang Qi Peng Wei

Preparation and characterization of positive materials LiMn1-xFexPO4(0x<1) for lithium ion batteries

Yue Min, Hu She-Jun, Hou Xian-Hua, Liang Qi, Peng Wei
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Publishing process
  • Received Date:  08 April 2010
  • Accepted Date:  19 May 2010
  • Published Online:  15 March 2011

Preparation and characterization of positive materials LiMn1-xFexPO4(0x<1) for lithium ion batteries

  • 1. (1)BTR New Energy Materials Inc,Shenzhen 518057,China; (2)School of Physics and Telecommunication Engineering,South China Normal University,Guangzhou 510006, China

Abstract: In this study, a series of phase-pure LiMn1-xFexPO4/C (x=0.2, 0.4, 0.6) cathode materials were successfully synthesized by solid-state method. The structure, particle size, surface morphology and electrochemical properties of these cathode active materials were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), electrochemical model cell and cyclic voltammograms (CV). The results indicated that the different atom ratio of Mn/Fe affected its electrochemical preformance. A lithium battery using LiMn0.6Fe0.4PO4 as the active materials of the positive electrode exhibits a high initial charge capacity and discharge capacity of 141.5 mAh g-1 and 125.7 mAh g-1, respectively, and the initial coulombic efficiency is 88.8%. After 25 cycles, it retains 99.8% of the initial discharge capacity at 0.2C rate, showing perfect cyclic property.

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