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Rational Construction of 2D Fe3O4@Carbon Core–Shell Nanosheets as Advanced Anode Materials for High-Performance Lithium-Ion Half/Full Cells |
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| Authors: | Dongyang Qu Dr Zhonghui Sun Jianan Xu Zhongqian Song Huijun Kong Bolin Zhao Prof Xiandui Dong Prof Li Niu |
| Institution: | 1. State Key Laboratory of Electroanalytical Chemistry, Engineering Laboratory for Modern Analytical Techniques, CAS Center for Excellence in Nanoscience, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022 Jilin, P.R. China
University of Science and Technology of China, Hefei, 230026 Anhui, P.R. China These authors contributed equally to this work.;2. Center for Advanced Analytical Science, School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou, 510006 P.R. China These authors contributed equally to this work.;3. State Key Laboratory of Electroanalytical Chemistry, Engineering Laboratory for Modern Analytical Techniques, CAS Center for Excellence in Nanoscience, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022 Jilin, P.R. China;4. Center for Advanced Analytical Science, School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou, 510006 P.R. China;5. State Key Laboratory of Electroanalytical Chemistry, Engineering Laboratory for Modern Analytical Techniques, CAS Center for Excellence in Nanoscience, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022 Jilin, P.R. China University of Science and Technology of China, Hefei, 230026 Anhui, P.R. China |
| Abstract: | Transition metal oxides have vastly limited practical application as electrode materials for lithium-ion batteries (LIBs) due to their rapid capacity decay. Here, a versatile strategy to mitigate the volume expansion and low conductivity of Fe3O4 by coating a thin carbon layer on the surface of Fe3O4 nanosheets (NSs) was employed. Owing to the 2D core–shell structure, the Fe3O4@C NSs exhibit significantly improved rate performance and cycle capability compared with bare Fe3O4 NSs. After 200 cycles, the discharge capacity at 0.5 A g?1 was 963 mA h g?1 (93 % retained). Moreover, the reaction mechanism of lithium storage was studied in detail by ex situ XRD and HRTEM. When coupled with a commercial LiFePO4 cathode, the resulting full cell retains a capacity of 133 mA h g?1 after 100 cycles at 0.1 A g?1, which demonstrates its superior energy storage performance. This work provides guidance for constructing 2D metal oxide/carbon composites with high performance and low cost for the field of energy storage. |
| Keywords: | core–shell structures electrochemistry hydrothermal synthesis lithium-ion batteries nanostructures |