Li0.99Ti0.01FePO4/C composite as cathode material for lithium ion battery |
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Authors: | Guan Wang Yan Cheng Manming Yan Zhiyu Jiang |
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Affiliation: | (1) Department of Chemistry, and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai, 200433, People’s Republic of China |
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Abstract: | Three kinds of LiFePO4 materials, mixed with carbon (as LiFePO4/C), doped with Ti (as Li0.99Ti0.01FePO4), and treated both ways (as Li0.99Ti0.01FePO4/C composite), were synthesized via ball milling by solid-state reaction method. The crystal structure and electrochemical behavior of the materials were investigated using X-ray diffraction, SEM, TEM, cyclic voltammetry, and charge/discharge cycle measurements. It was found that the electrochemical behavior of LiFePO4 could be increased by carbon coating and Ti-doping methods. Among the materials, Li0.99Ti0.01FePO4/C composite presents the best electrochemical behavior, with an initial discharge capacity of 154.5 mAh/g at a discharge rate of 0.2 C, and long charge/discharge cycle life. After 120 cycles, its capacity remains at 92% of the initial capacity. The Li0.99Ti0.01FePO4/C composite developed here can be used as the cathode material for lithium ion batteries. |
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Keywords: | LiFePO4 Ti-doping Carbon Cathode material Lithium ion battery |
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