Acta Phys. -Chim. Sin. ›› 2004, Vol. 20 ›› Issue (10): 1249-1252.doi: 10.3866/PKU.WHXB20041017

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Synthesis and Performance of LiMnPO4 Used as Cathode Material for Lithium Ion Batteries

Chang Xiao-Yan;Wang Zhi-Xing;Li Xin-Hai;Kuang Qiong;Peng Wen-Jie;Guo Hua-Jun;Zhang Yun-He   

  1. School of Metallurgical Science and Engineering, Central South University, Changsha 410083
  • Received:2004-03-26 Revised:2004-06-03 Published:2004-10-15
  • Contact: Wang Zhi-Xing E-mail:zxwang@mail.csu.edu.cn

Abstract: Olivine LiMnPO4 was synthesized at 600 ℃ and 800 ℃ by the method of solid-state reaction combining with the addition of carbon black and ball-milling of reagents and precursors. Structure, surface morphology and charge/discharge performance of LiMnPO4 were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), and electrochemical measurement, respectively. Sample synthesized at 600 ℃ by ball-milling of reagents for 24 h and precursors for 12 h contains impurities and large, densely sintered blocks .Pure olivine LiMnPO4 with large particle size is obtained at 800 ℃ by the same ball-milling process. It is shown that these materials can′t charge or discharge effectively in the electrochemical tests. On the contrary, sample prepared at 600 ℃ by ball-milling of reagents for 36 h and precursors for 24 h presents pure phase with small and almost identical particles size (about 100~200 nm). The initial discharge capacity of this sample is approximately 100 mAh•g-1. Mixing of the agents and the precursors and the choice of sintering temperature are two important factors to obtain pure olivine LiMnPO4 with reversible charge-discharge capacity.

Key words: Lithium ion batteries, LiMnPO4, Olivine, Cathode materials, Synthesis, Electrochemical performance