Combustion synthesis and electrochemical performance of Li₂FeSiO₄/C cathode material for lithium-ion batteries

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• 作者：Mohammed Dahbi ; ^{mohammed.dahbi@mkem.uu.se} ; Sigita Urbonaite¹ ; Torbjö ; rn Gustafsson
• 关键词：Lithium-ion batteries ; Lithium iron orthosilicate ; Combustion synthesis
• 刊名：Journal of Power Sources
• 出版年：2012
• 出版时间：1 May, 2012
• 年：2012
• 卷：205
• 期：Complete
• 页码：456-462
• 全文大小：1719 K

文摘

A novel preparation technique was developed for synthesizing Li₂FeSiO₄/C nanoparticles through combustion of reaction mixtures containing silicon source, Li and Fe sources that operate as oxidizers and sucrose that act as a fuel. A systematic investigation of the synthesis parameters, such as the effect of the fuel content, on purity, morphology and electrochemical properties of the samples was performed. The samples were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), specific surface area (BET) and electrochemical measurements, respectively. Among the synthesized cathode materials, Li₂FeSiO₄ obtained with 1.5 mol of sucrose, showed the best electrochemical performance in terms of discharge capacity, cycling stability and rate capability. Discharge capacity of 130 mAh/g at C/20, 88 mAh/g at C/2 and 44 mAh/g at 2C were obtained with no capacity fading after 50 cycles.