Journal
ELECTROCHIMICA ACTA
Volume 255, Issue -, Pages 205-211Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2017.09.165
Keywords
lithium ion battery; cathode material; lithium manganese phosphate; lithium iron phosphate; magnetic property
Categories
Funding
- National Natural Science Foundation of China (NNSFC) [21673051]
- Guangdong Province Science AMP
- Technology Bureau [2016A010104015, 2014A010106029, 2014B010106005]
- Guangzhou Science AMP
- Innovative Committee [201604030037]
- Youth Foundation of Guangdong University of Technology [252151038]
- National Natural Science Foundation of Guangdong Province [U1401246]
- Science and Technology Program of Guangzhou City of China [201508030018]
- National Natural Science Foundation of China [U1401246, 51276044, 20971027]
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Cathode materials LiMn0.5Fe0.5PO4/C and LiMnPO4/C were synthesized by a high-energy ball-milling assisted sol-gel method. The LiMn0.5Fe0.5PO4 consists of nanorods and nanoparticles homogeneously wrapped with highly ordering carbon. The increased Neel-temperature and decreased effective magnetic moment of LiMn0.5Fe0.5PO4/C revealed the microstructure differences from LiMnPO4/C. Meanwhile, tiny amount of ferromagnetic impurities is detected in LiMn0.5Fe0.5PO4/C by magnetic tests. The synergetic effects of Fe substitution and carbon coating remarkably improve rate capacity and cyclic stability of LiMn0.5Fe0.5PO4/C. This solid solution delivers initial discharge capacities of 128.6 mAh g(-1) and 116.3 mAh g(-1) and capacity retentions of 93.5% and 90.3% after 100 cycles at 1C and 2C respectively, significantly better than LiMnPO4/C. (C) 2017 Elsevier Ltd. All rights reserved.
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