One-step hydrothermal synthesis of LiMn2O4 cathode materials for rechargeable lithium batteries |
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| Institution: | 1. Department of Advanced Materials, College of Materials Science and Engineering, Sichuan University, Chengdu, 610065, China;2. Institute of New Energy and Low-carbon Technology, Sichuan University, Chengdu, 610065, China;1. Department of Chemistry, College of Sciences, Shanghai University, Shanghai 200444, PR China;2. Department of Physics, College of Sciences, Shanghai University, Shanghai 200444, PR China;1. National Center for Nanoscience and Technology of China, Beijing 100190, PR China;2. Department of Physics, Tsinghua University, Beijing 100080, PR China;1. School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang 453007, Henan, PR China;2. National Research Council of Canada, Vancouver, BC, Canada V6T IW5;1. State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemistry & Chemical Engineering, Nanjing Tech University, Number 5 Xin Mofan Road, Nanjing, Jiangsu 210009, People''s Republic of China;2. Department of Chemical Engineering, Curtin University, Perth, Western Australia 6845, Australia;1. School of Chemical Machinery, Dalian University of Technology, Dalian 116024, China;2. Center for Green Products and Processing Technologies, Guangzhou HKUST Fok Ying Tung Research Institute, Guangzhou 511458, China;3. School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China;4. Department of Chemical and Biomolecular Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China |
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| Abstract: | LiMn2O4 cathode materials with high discharge capacity and good cyclic stability were prepared by a simple one-step hydrothermal treatment of KMnO4, aniline and LiOH solutions at 120–180 °C for 24 h. The aniline/KMnO4 molar ratio (R) and hydrothermal temperature exhibited an obvious influence on the component and phase structures of the resulting product. The precursor KMnO4 was firstly reduced to birnessite when R was less than 0.2:1 at 120–150 °C. Pure-phased LiMn2O4 was formed when R was 0.2:1, and the LiMn2O4 was further reduced to Mn3O4 when R was kept in the range of 0.2–0.3 at 120–150 °C. Moreover, LiMn2O4 was fabricated when R was 0.15:1 at 180 °C. Octahedron-like LiMn2O4 about 300 nm was prepared at 120 °C, and particle size decreased with an increase in hydrothermal temperature. Especially, LiMn2O4 synthesized at 150 °C exhibited the best electrochemical performance with the highest initial discharge capacity of 127.4 mAh g?1 and cycling capacity of 106.1 mAh g?1 after 100 cycles. The high discharge capacity and cycling stability of the as-prepared LiMn2O4 cathode for rechargeable lithium batteries were ascribed to the appropriate particle size and larger cell volume. |
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| Keywords: | Hydrothermal reaction Crystal growth Particle size Electrochemical properties |
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