Preparation of Li₂FeSiO₄/C Composite Cathode Materials for Lithium Ion Batteries by Carbothermal Reduction Method

Abstract:

The Li₂FeSiO₄/C composite cathode material was synthesized by carbothermal reduction method using Li₂CO₃, Fe₂O₃ and (C₂H₅O) ₄Si and sucrose as raw materials, The prepared samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), thermal gravimetric analysis (TGA) and electrochemical test methods. The influence of sintering temperatures on the electrochemical properties of Li₂FeSiO₄/C was examined. The results indicated that the as-synthetized Li₂FeSiO₄ are orthorhombic structure. The highly pure Li₂FeSiO₄ material with uniform and nanosized particle was synthesized and showed a high specific capacity and good cycle performance by sintering at 600°C for 12h. The initial discharge capacity of Li₂FeSiO₄/C composite cathode material was 140.2 mAh/g at 0.2C rate in a potential range of 1.5-4.7V (vs. Li/Li+) at room temperature, and the discharge capacity was maintained at 141.7 mAh/g after 50 cycles.

• Periodical: Advanced Materials Research (Volumes 724-725)
• Pages: 838-843
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.724-725.838
• Online since: August 2013
• Authors: Zheng Zhang, Xing Quan Liu, Shen Si Ma, Hong Yuan Zhao
• Keywords: Carbothermal Reduction Method, Cathode Material, Li₂FeSiO₄, Lithium-Ion Battery

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