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Author(s): |
Cong Ni, Nanjing University of Technology, College of Materials Science and Engineering, Nanjing, China, 210009
Xiang-yin Mo, Nanjing Normal University, Analysis and Testing Center and Jiangsu Key Laboratory of Biofunctional Materials, Nanjing, China,
Yi Ding, Nanjing Normal University, Analysis and Testing Center and Jiangsu Key Laboratory of Biofunctional Materials, Nanjing, China,
Cai-rong Kang, Nanjing University of Technology, College of Materials Science and Engineering, Nanjing, China, 210009 |
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Abstract: |
In order to improve the electrochemical performance of LiFePO4, LiFePO4/C cathode material was synthesized for lithium rechargeable batteries by two step ball-milling and high temperature solid-state reaction, using Li2CO3, FeC2O4·2H2O, (NH4)2HPO4 as raw materials and polycarboxylate as carbon source. Effect of different contents of polycarboxylate on the structure and performance of the samples was discussed. On the one hand, effect of polycarboxylate doping on crystal structure and surface morphology of LiFePO4/C composite material was investigated by using X-ray diffraction, and scanning electron microscope/X-ray energy dispersive spectroscopy. On the other hand, electrochemical measurements were used to study effect of polycarboxylate doping on charge/discharge performance and cycle stability of LiFePO4/C composite material. Results indicated that the prepared samples by doping polycarboxylate have single olivine structures and uniform particle sizes, and exhibited excellent electrochemical performances and enhanced stabilities. Among them, product with polycarboxylate content of 10wt.% showed the best specific discharge capacity and cycle performance, and its first specific discharge capacity was 130.6 mAh/g at 0.1C.
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