Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 532, Issue -, Pages 25-30Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2012.04.008
Keywords
Lithium-ion batteries; Lithium iron phosphate; Manganese doping; Energy density; Rate performance
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Funding
- Natural Science Foundation of China [50825203]
- MOST [2009AA03Z225, 2011AA11290]
- PCSIRT (Program for Changjiang Scholars and Innovative Research Team in University)
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LiFe0.8Mn0.2PO4/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 LiFe0.8Mn0.2PO4/C sample sintered at 600 degrees C exhibits the best performance with initial discharge capacities of 160 mAh g(-1) at 0.1 C, 133 mAh g(-1) at 5 C and 122 mAh g(-1) 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(-1). 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. LiFe0.8Mn0.2PO4 should be identified as highly promising cathode material with high energy density. (C) 2012 Elsevier B.V. All rights reserved.
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