Electrochemical properties of magnesium doped LiFePO₄ cathode material prepared by sol-gel method

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• 作者：Xiaohui Zhao ; Dong-Ho Baek ; James Manuel ; Min-Yeong Heo ; Rong Yang ; Jong Keun Ha ; Ho-Suk Ryu ; Hyo-Jun Ahn ; Ki-Won Kim ; Kwon-Koo Cho ; Jou-Hyeon Ahn
• 关键词：A. Composites ; B. Sol&ndash ; gel chemistry ; C. Electrochemical measurements ; D. Electrochemical properties ; D. Energy storage
• 刊名：Materials Research Bulletin
• 出版年：2012
• 出版时间：October, 2012
• 年：2012
• 卷：47
• 期：10
• 页码：2819-2822
• 全文大小：678 K

文摘

Magnesium doped Li_1?2xMg_xFePO₄/C (x = 0.00, 0.01, 0.03, 0.05) cathode materials were synthesized by sol-gel method, and the effect of magnesium doping as well as its content on the electrochemical properties for lithium batteries was also investigated_. Their morphology was studied with field emission scanning electron microscope and Li_1?2xMg_xFePO₄ materials showed the olivine phase without impurities. The thin carbon layer of Li_1?2xMg_xFePO₄/C was confirmed by high resolution transmission electron microscopy. The magnesium doped Li_1?2xMg_xFePO₄/C particles were smaller than those undoped. The Li_1?2xMg_xFePO₄/C materials showed better cycling behavior than undoped LiFePO₄, especially at high C-rate in which Li_0.94Mg_0.03FePO₄/C composition exhibited the best electrochemical properties.