One-step hydrothermal synthesis of 3D porous microspherical LiFePO4/graphene aerogel composite for lithium-ion batteries |
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| Affiliation: | 1. Key Laboratory for Liquid-Solid Structural Evolution and Process of Materials (Ministry of Education), Shandong University, Jinan 250061, China;2. School of Materials Science and Engineering, Shandong University, Jinan 250061, China;3. School of Materials Science and Engineering, Shandong Polytechnic University, Jinan 250353, China;1. College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, China;2. State Key Laboratory of Advanced Transmission Technology, Global Energy Interconnection Research Institute Co. Ltd, Beijing 102211, China;1. School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, PR China;2. Instrumental Analysis and Research Center, Shanghai University, Shanghai 200444, PR China;1. Department of Chemistry, Amirkabir University of Technology, Tehran, Iran;2. Fuel Cell and Solar Cell Lab, Renewable Energy Research Center, Amirkabir University of Technology, Tehran, Iran;3. Department of Mining and Metallurgical Engineering, Amirkabir University of Technology, Tehran, Iran;4. Department of Chemistry, Science Faculty, Golestan University, Gorgan, Iran;1. Department of Materials Science, Fudan University;2. Center of Special Materials and Technology, Fudan University, Shanghai, 200433, China |
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| Abstract: | Three-dimensional (3D) porous LiFePO4/graphene aerogel (LFP/GA) composite was successfully prepared by an in-situ hydrothermal process. In this composite, the LiFePO4 microspheres assembled by nanoparticles were embedded in a three-dimensional framework intertwined with the graphene sheets, which acts as a bridge for transfer of electron and diffusion of lithium ion. The large specific surface of the composite structure enables the increased infiltration area and utilization of the active material. The content of the graphene sheet is analyzed and is found important for the Li-storage characteristics of LiFePO4. An aerogel composite with 10% of graphene displays the best electrochemical performance, with the specific discharge capacities of 168 mAh g?1 and 155 mAh g?1 at respectively 0.1C and 1C, and the capacity retains 96.3% for up to 800 cycles. This novel 3D porous aerogel composite is identified as a promising cathode material for the rechargeable Li battery, and the simple strategy may be applied to construct other high performing composite structure and materials. |
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| Keywords: | Graphene aerogel Composite cathode material |
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