New insight into the modification of Li-rich cathode material by stannum treatment |
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| Affiliation: | 1. School of Metallurgy and Environment, Central South University, Changsha 410083, PR China;2. Chimie du Solide-Energie, UMR 8260, College de France, 11 Place Marcelin Berthelot, 75231 Paris, Cedex 05, France;1. Energy1 Laboratory, Battery R&D Center, Samsung SDI Co., Ltd., Yeongtong-gu, Suwon-si, Gyeonggi-do, Republic of Korea;2. Core Technology Laboratory, Battery R&D Center, Samsung SDI Co., Ltd., Yeongtong-gu, Suwon-si, Gyeonggi-do, Republic of Korea;3. Cell Material Development Group, Samsung SDI Co., Ltd., Seobuk-gu, Cheonan-si, Chungcheongnam-do, Republic of Korea;1. Key Laboratory of Graphene Technologies and Applications of Zhejiang Province, Ningbo Institute of Materials Technology & Engineering (NIMTE), Chinese Academy of Sciences, Ningbo, Zhejiang 315201, PR China;2. College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing 100049, PR China;1. School of Physics and Mechanical & Electrical Engineering, Jishou University, Jishou, Hunan 416000, China;2. School of Chemistry and Chemical Engineering, Jishou University, Jishou, Hunan 416000, China;3. College of Biology and Environmental Sciences, Jishou University, Jishou, Hunan 416000, China;4. School of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan 410083, China |
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| Abstract: | In this work, Sn is used to dope the Li-rich cathode material to improve the electrochemical performance of Li ion battery. After Sn treatment, the lattice parameters a, c and lattice volume V become larger. Compared with the pristine sample, the Sn-contained samples show longer plateaux at about 4.5 V in the first charging process, which means that Sn can activate the Li2MnO3 component. Meanwhile, with appropriate content of Sn doping, the sample exhibits enhanced rate capability and cycling stability. Especially, the sample S10 shows the best electrochemical performance, with a capacity retention of 88.66% after 100 cycles at 1 C (1 C=250 mA g−1). The mechanisms of Sn doping have also been investigated. The increased activation of Li2MnO3 is due to the improved conductivity of Li2MnO3 phase by Sn doping, and the enhanced electrochemical performance is mainly ascribed to the increased ability of Li ion diffusing into bulk phase and the improved structure stability during the prolonged charge-discharge cycles. It is suggested that Sn doping is an effective way to improve the electrochemical performance of Li-rich cathode material. |
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| Keywords: | Li ion battery Li-rich Sn doping |
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