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Enhanced electrochemical performance of carbon-LiMn1−xFexPO4 nanocomposite cathode for lithium-ion batteries |
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| Authors: | Seung-Min Oh Hun-Gi JungChong Seung Yoon Seung-Taek MyungZonghai Chen Khalil Amine Yang-Kook Sun |
| Affiliation: | a Department of WCU Energy Engineering, Hanyang University, Seoul 133-791, South Korea b Department of Chemical Engineering, Hanyang University, Seoul 133-791, South Korea c Department of Materials Science and Engineering, Hanyang University, Seoul 133-791, South Korea d Department of Chemical Engineering, Iwate University, 4-3-5 Ueda, Morioka, Iwate 020-8551, Japan e Electrochemical Technology Program, Chemical Sciences and Engineering Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439, USA |
| Abstract: | 4 V-class olivine C-LiMn1−xFexPO4 (x = 0 and 0.15) are synthesized by ultrasonic pyrolysis followed by ball milling with AB carbon to evaluate the doping effect of iron. The C-LiMn0.85Fe0.15PO4 shows excellent rate capability having discharge capacity of 150 mAh g−1 at 0.5C-rate and 121 mAh g−1 at 2C-rate. The capacity retention of the C-LiMn0.85Fe0.15PO4 is 91% after 50 cycles at 55 °C whereas C-LiMnPO4 is limited to 87%. The improved electrochemical performance of the C-LiMn0.85Fe0.15PO4 electrode is attributed to the enhanced electrical conductivity caused by tighter binding on the carbon particles with the LiMn0.85Fe0.15PO4 primary particles as well as by the surface coating of carbon on the primary particles. |
| Keywords: | Carbon coating Olivine Iron doping Nanocomposite Lithium battery |
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