High performance Li₂MnSiO₄ prepared in molten KCl-NaCl for rechargeable lithium ion batteries

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• 作者：Fei Wang ; Yanming Wang ; Dengming Sun ; Lei Wang ; Jun Yang ; Haiping Jia
• 关键词：Lithium ion battery ; Molten salt method ; Lithium manganese silicate ; Cyclability
• 刊名：Electrochimica Acta
• 出版年：10 February, 2014
• 年：2014
• 卷：119
• 期：Complete
• 页码：131-137
• 全文大小：3256 K

文摘

Li₂MnSiO₄/C composites have been prepared by a facile molten salt method followed by a carbon coating process. Submicron Li₂MnSiO₄ particles are obtained in KCl-NaCl molten phase with a short reaction time of 3 h. The orthorhombic structure and sphere-like morphology are confirmed by X-ray diffraction and scanning electron microscope. Ex-situ XRD study confirms amorphous transition of Li₂MnSiO₄ during the first charge process. Galvanostatic charge-discharge tests display high initial charge and discharge capacities of 265 and 194 mAh g^鈭?, respectively, at 0.05 C rate for the Li₂MnSiO₄/C composite prepared at 700 掳C. At 0.1 C rate, it maintains a discharge capacity of 165 mAh g^鈭? and its capacity retention at the 50^th cycle is up to 78%, showing superior cycling stability.