Preparation and electrochemical performance of carbon-coated LiFePO4/LiMnPO4-positive material for a Li-ion battery |
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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 100049, China;1. School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China;2. Guangxi Colleges and Universities Key Laboratory of Novel Energy Materials and Related Technology, Nanning 530004, China;3. The New Rural Development Research Institute, Guangxi University, Nanning 530004, China;1. Key Laboratory for Liquid-Solid Structural Evolution & Processing of Materials (Ministry of Education), Shandong University, Jinan 250061, China;2. Research Institute of Technology, Shandong WINA Green Power Technology Co., Ltd., Weifang 262700, China;1. Department of Physics, South China University of Technology, Guangzhou, 510640, PR China;2. School of Physics and Optoelectronic Engineering, Guangdong University of Technology, Guangzhou, 510006, PR China;1. School of Metallurgy, Northeastern University, Shenyang 110819, People''s Republic of China;2. School of Resources and Materials, Northeastern University at Qinhuangdao, Qinhuangdao 066004, People''s Republic of China;3. School of Materials Science and Engineering, Northeastern University, Shenyang 110819, People''s Republic of China;4. Hebei Key Laboratory of Dielectric and Electrolyte Functional Material, Qinhuangdao 066004, People''s Republic of China;5. Metallurgical Technology Research Department, Central Iron & Steel Research Institute, Beijing 100081, People''s Republic of China |
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| Abstract: | Lithium iron phosphate (LiFePO4)/lithium manganese phosphate (LiMnPO4)-positive material was successfully prepared through ball milling and high-temperature sintering using manganese acetate, lithium hydroxide, ammonium dihydrogen phosphate, and ferrous oxalate as raw materials. The as-prepared samples were characterized by X-ray diffraction, transmission electron microscopy, scanning electron microscopy, a constant current charge–discharge test, cyclic voltammetry, and electrochemical impedance spectroscopy. The effects of lithium iron phosphate coating were also discussed. Because of its special core–shell structure, the as-prepared LiMn0.7Fe0.3PO4–LiFePO4–C exhibits excellent electrochemical performance. The discharge capacity reached 136.6 mAh/g and the specific discharge energy reached 506.9 Wh/kg at a rate of 0.1 C. |
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| Keywords: | Composite Core–shell structure Positive material Li-ion battery |
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