LiFe_0.8Mn_0.2PO₄/C cathode material with high energy density for lithium-ion batteries

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• 作者：Zhao-Hui Wang ; Li-Xia Yuan ; Wu-Xing Zhang ; Yun-Hui Huang ; ^{huangyh@mail.hust.edu.cn}
• 关键词：Lithium-ion batteries ; Lithium iron phosphate ; Manganese doping ; Energy density ; Rate performance
• 刊名：Journal of Alloys and Compounds
• 出版年：2012
• 期刊代码：45_09258388
• 类别：ms
• 出版时间：15 August, 2012
• 卷：532
• 期：Complete
• 页码：25-30
• 文件大小：1528 K

摘要

LiFe_0.8Mn_0.2PO₄/C composites are synthesized via solid state reaction promoted by wet ball milling. Synthesis conditions are optimized to obtain desirable crystallization, morphology, particle size and specific surface area. Our experiments show that the LiFe_0.8Mn_0.2PO₄/C sample sintered at 600 掳C exhibits the best performance with initial discharge capacities of 160 mAh g^鈭? at 0.1 C, 133 mAh g^鈭? at 5 C and 122 mAh g^鈭? at 10 C. At 5 C, the cathode exhibits an excellent cyclability over 100 cycles, and the average specific energy density is as high as 414 Wh kg^鈭?. We attribute the superior performance to well crystallization, uniform morphology, small particle size and high specific surface area. Our results indicate that partial substitution of Mn ions for Fe ions can significantly improve rate capability and energy density in LiFePO₄. LiFe_0.8Mn_0.2PO₄ should be identified as highly promising cathode material with high energy density.