Improved electrochemical performance of Li1.2Ni0.2Mn0.6O2 cathode material for lithium ion batteries synthesized by the polyvinyl alcohol assisted sol-gel method |
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| Affiliation: | 1. School of Physics and Mechanical ＆ Electrical Engineering, Jishou University, Jishou, Hunan 416000, China;2. The Collaborative Innovation Center of Manganese-Zinc-Vanadium Industrial Technology (the 2011 Plan of Hunan Province), Jishou, Hunan 416000, China;3. School of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan 410083, China;1. School of Material Science and Technology, Jiangsu University, Zhenjiang 212013, China;2. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;1. School of Material Science and Technology Jiangsu University, Zhenjiang 212013, China;2. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;3. Energy Storage and Distributed Resources Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA;1. School of Physics and Electronic Science, Changsha University of Science and Technology, Changsha 410114, China;2. Department of Mechanical and Biomedical Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong;1. College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, PR China;2. College of Physics, Optoelectronics and Energy, Soochow University, Suzhou 215006, PR China;1. School of Materials Science and Engineering, Hefei University of Technology, Hefei, Anhui 230009, PR China;2. Department of Chemistry & Chemical Engineering, Anqing Normal University, Anqing, Anhui 246011, PR China |
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| Abstract: | Li-rich Mn-based cathode materials (Li1.2Ni0.2Mn0.6O2) have been synthesized by a polyvinyl alcohol (PVA)-assisted sol-gel method. The influence of PVA content on the structure and electrochemical performance of Li1.2Ni0.2Mn0.6O2 has been investigated respectively. XRD results of the Li1.2Ni0.2Mn0.6O2 powders show that they exhibit similar XRD patterns as those of Li-rich Mn-based cathode materials, and the crystalline nature of the layered compound are improved by the presence of PVA. Physical characterizations indicate that the as-synthesized oxide is composed of uniform and separated particles compared to the larged aggregated ones of the product synthesized under the same condition but without PVA. As cathode for lithium ion battery, the material synthesized with 10% PVA exhibits not only a relatively high discharge capacity of 254.2 mA h g?1, but also excellent rate performance and good cycling performance. EIS results show that the material synthesized with PVA decreases the charge-transfer resistance and enhances the reaction kinetics, which is considered to be the major factor for higher rate performance. |
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| Keywords: | Lithium ion battery Cathode materials Li-rich Mn-based Sol-gel |
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