Acta Phys. -Chim. Sin. ›› 2009, Vol. 25 ›› Issue (05): 1004-1008.doi: 10.3866/PKU.WHXB20090418

• ARTICLE • Previous Articles     Next Articles

Preparation of Li2FeSiO4 Cathode Material for Lithium-Ion Batteries by Microwave Synthesis

HU Guo-Rong, CAO Yan-Bing, PENG Zhong-Dong, DU Ke, JIANG Qing-Lai   

  1. School of Metallurgical Science and Engineering, Central South University, Changsha 410083, P. R. China
  • Received:2008-12-01 Revised:2008-12-26 Published:2009-05-04
  • Contact: HU Guo-Rong

Abstract:

We report a novel synthetic route for the preparation of the Li2FeSiO4 cathode material by microwave processing. The Li2FeSiO4 material was synthesized using mechanical ball-milling and subsequent microwave processing. The prepared samples were characterized by X-ray diffraction, scanning electron microscopy, and electrochemical methods. Properties of the prepared materials and electrochemical characteristics of the samples were investigated and compared to samples prepared by the conventional solid-state reaction. The obtained results indicated that highly pure Li2FeSiO4 material with uniform and fine particle size was quickly and successfully synthesized by microwave (MW) heating at 650 ℃ for 12 min. This compound showed high specific capacity and good cycle ability. The initial discharge capacity of the sample obtained by MW heating delivered 119.5 mAh·g-1 at 60 ℃ at a current density of C/20 rate (1C=160 mA·g-1). After 10 cycles the discharge capacity maintained 116.2 mAh·g-1. The Li2FeSiO4 material displayed higher phase purity, better microstructure, and better electrochemical properties than the sample prepared by the conventional solid-state method.

Key words: Li-ion battery, Cathode material, Li2FeSiO4, Microwave synthesis

MSC2000: 

  • O646