Synthesis of Li2FeSiO4/C Composite as Cathode Materials for Lithium Ion Battery by Microwave Assisted Solid Reaction Method

doi:10.3724/SP.J.1077.2012.11763

Abstract

Abstract: The homogeneous distribution of FeOOH/SiO₂ precursor material was prepared from FeCl₂•4H₂O and Na₂SiO₃•9H₂O by low-heating solid-state reaction. Then Li₂FeSiO₄/C composites were prepared by microwave assisted solid reaction method, with prepared precursor FeOOH/SiO₂and Li₂CO₃as the starting materials, PVA and super-P carbon as carbon sources. The prepared samples were characterized by X-ray diffractometry, SEM, TEM, and galvanostatic charge-discharge test. Highly pure Li₂FeSiO₄/C material with uniform and fine particle size was obtained at 650℃ in 12 min. Under the selective microwave synthesis system, super-P carbon powder and pyrolyzed amorphous carbon not only effectively provided the high temperature to induce the complete reaction but also formed the conductive network to enhance the electronic conductivity. The optimum Li₂FeSiO₄/C composite displayed discharge capacity of 129.6 mAh/g at 0.05C rate and 107.5 mAh/g at 0.5C rate at 60℃. After 15 cycles the discharge capacity maintained 104.8 mAh/g at 0.5C, indicating good electrochemical capacity and cycling stability. Consequently, the results show that microwave assisted solid synthesis process is a promising method for preparing Li₂FeSiO₄/C composite.

Key words: cathode materials, Li₂FeSiO₄, microwave assisted solid synthesis, carbon coating

CLC Number:

TM912

CAO Yan-Bing, DUAN Jian-Guo, HU Guo-Rong, JIANG Feng, PENG Zhong-Dong, DU Ke. Synthesis of Li2FeSiO4/C Composite as Cathode Materials for Lithium Ion Battery by Microwave Assisted Solid Reaction Method[J]. Journal of Inorganic Materials, 2012, 27(10): 1023-1029.

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