| Phase transition of lithiated-spinel Li2Mn2O4 at high temperature |
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| 引用本文： | 唐新村 黄伯云 贺跃辉. Phase transition of lithiated-spinel Li2Mn2O4 at high temperature[J]. 中国有色金属学会会刊, 2006, 16(2): 438-444. DOI: 10.1016/S1003-6326(06)60075-7 |
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| 作者姓名： | 唐新村 黄伯云 贺跃辉 |
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| 作者单位： | School of Chemistry and Chemical Engineering Central South University Changsha 410083 China State Key Laboratory of Powder Metallurgy Central South University Changsha 410083 China，State Key Laboratory of Powder Metallurgy Central South University Changsha 410083 China，State Key Laboratory of Powder Metallurgy Central South University Changsha 410083 China |
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| 基金项目： | 中国科学院资助项目;中南大学校科研和教改项目 |
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| 摘 要： | 1 Introduction Lithium manganese oxides are the most attractive cathode materials for rechargeable lithium-ion batteries because of their low-cost and less toxicity when compared with either cobaltates or nickelates[1?3]. Among these oxides, the spinel-fr…
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| 关 键 词： | Li2Mn2O4 锂离子电池 高温 相变 |
| 收稿时间： | 2005-06-09 |
| 修稿时间： | 2005-09-26 |
Phase transition of lithiated-spinel Li2Mn2O4 at high temperature |
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| TANG Xin-cun,HUANG Bai-yun,HE Yue-hui. Phase transition of lithiated-spinel Li2Mn2O4 at high temperature[J]. Transactions of Nonferrous Metals Society of China, 2006, 16(2): 438-444. DOI: 10.1016/S1003-6326(06)60075-7 |
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| Authors: | TANG Xin-cun HUANG Bai-yun HE Yue-hui |
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| Affiliation: | 1. School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China;2. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;1. Department of Chemistry, College of Science, Honghe University, Mengzi, 661199, Yunnan, China;2. Local Characteristic Resource Utilization and New Materials Key Laboratory of Universities in Yunnan, Honghe University, Mengzi, 661199, Yunnan, China;1. Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan, 453007, PR China;2. College of Materials Science and Technology, Jiangsu Key Laboratory of Materials and Technology for Energy Conversion, Nanjing University of Aeronautics and Astronautics, 210016, Nanjing, PR China;1. School of Chemistry and and Pharmaceutical Sciences, Guangxi Normal University, Guilin 541004, PR China;2. Guangxi Key Laboratory of Low Carbon Energy Materials, Guangxi Normal University, Guilin 541004, PR China;3. Hubei Key Laboratory for Processing and Application of Catalytic Materials, Huanggang Normal University, Huanggang 438000, PR China;1. State Key Lab of Physical Chemistry of Solid Surfaces, Department of Chemistry, College of Chemistry and Chemical Engineering, Collaborative Innovation Center of Chemistry for Energy Materials, Xiamen University, Xiamen 361005, P. R, China;2. School of Energy Research, Xiamen University, Xiamen University, Xiamen 361005, P. R, China |
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| Abstract: | The phase transition of Li2Mn2O4 spinel at high temperature was investigated by XRD, TG/DTA, average oxidation state of Mn and cyclic voltammeric techniques. The results reveal that the Li2Mn2O4 spinel is unstable. At high temperature, it is easy to transform into [Li2−2x]tet[Mn2−xLix]octO4, which accompanies the formation of Li2MnO3 impurities. The phase transition is associated with the transfer of Li+ from tetrahedral 8a sites to octahedral 16d sites. With the increasing sintering temperature from 450 °C to 850 °C, the phase structure varies from lithiated-spinel Li2Mn2O4 to Li4Mn5O12-like to LiMn2O4-like and finally to rock-salt LiMnO2-like. In addition, a way of determining x with average oxidation state of Mn and the content of Li2MnO3 was also demonstrated. |
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| Keywords: | lithium manganese oxide Li2Mn2O4 phase transition lithium-ion batteries |
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