Mesoporous composite of LiFePO4 and carbon microspheres as positive-electrode materials for lithium-ion batteries |
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| Institution: | 1. State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;2. University of Chinese Academy of Sciences, Beijing 100190, China;1. School of Materials Science and Engineering, Northwestern Polytechnical University, Xi''an 710072, China;2. Institute of Chemical Sciences, University of Peshawar, Khyber Paktunkhwa, Pakistan;1. Centre for Bulk Solids and Particulate Technologies, Newcastle Institute for Energy and Resources, The University of Newcastle, Callaghan 2308, Australia;2. Faculty of Mechanical Engineering, Leibniz University of Hanover, Hanover 30159, Germany;1. School of Petrochemical Engineering, Lanzhou University of Technology, Lanzhou 730050, China;2. Laboratory of Clean Energy Chemistry and Materials, Lanzhou Institute of Chemical Physics, Chinese Academy of Science, Lanzhou 730000, China |
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| Abstract: | Mesoporous LiFePO4/C microspheres consisting of LiFePO4 nanoparticles are successfully fabricated by an eco-friendly hydrothermal approach combined with high-temperature calcinations using cost-effective LiOH and Fe3+ salts as raw materials. In this strategy, pure mesoporous LiFePO4 microspheres, which are composed of LiFePO4 nanoparticles, were uniformly coated with carbon (∼1.5 nm). Benefiting from this unique architecture, these mesoporous LiFePO4/C microspheres can be closely packed, having high tap density. The initial discharge capacity of LiFePO4/C microspheres as positive-electrode materials for lithium-ion batteries could reach 165.3 mAh/g at 0.1 C rate, which is notably close to the theoretical capacity of LiFePO4 due to the large BET surface area, which provides for a large electrochemically available surface for the active material and electrolyte. The material also exhibits high rate capability (∼100 mAh/g at 8 C) and good cycling stability (capacity retention of 92.2% after 400 cycles at 8 C rate). |
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| Keywords: | Composite Nanoparticle Hydrothermal approach Positive-electrode material Lithium-ion battery |
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