A Single‐Step Hydrothermal Route to 3D Hierarchical Cu2O/CuO/rGO Nanosheets as High‐Performance Anode of Lithium‐Ion Batteries |
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| Authors: | Songhao Wu Gaoliang Fu Weiqiang Lv Jiake Wei Wenjin Chen Huqiang Yi Meng Gu Xuedong Bai Liang Zhu Chao Tan Yachun Liang Gaolong Zhu Jiarui He Xinqiang Wang Kelvin H L Zhang Jie Xiong Weidong He |
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| Affiliation: | 1. School of Energy Science and Engineering, University of Electronic Science and Technology, Chengdu, P. R. China;2. Department of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, P. R. China;3. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, P. R. China;4. School of Resources and Environment, University of Electronic Science and Technology, Chengdu, P. R. China;5. Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen, Guangdong, P. R. China;6. State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology, Chengdu, P. R. China;7. Shenzhen Li‐S Technology Co., Ltd., Shenzhen, P. R. China |
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| Abstract: | As anodes of Li‐ion batteries, copper oxides (CuO) have a high theoretical specific capacity (674 mA h g?1) but own poor cyclic stability owing to the large volume expansion and low conductivity in charges/discharges. Incorporating reduced graphene oxide (rGO) into CuO anodes with conventional methods fails to build robust interaction between rGO and CuO to efficiently improve the overall anode performance. Here, Cu2O/CuO/reduced graphene oxides (Cu2O/CuO/rGO) with a 3D hierarchical nanostructure are synthesized with a facile, single‐step hydrothermal method. The Cu2O/CuO/rGO anode exhibits remarkable cyclic and high‐rate performances, and particularly the anode with 25 wt% rGO owns the best performance among all samples, delivering a record capacity of 550 mA h g?1 at 0.5 C after 100 cycles. The pronounced performances are attributed to the highly efficient charge transfer in CuO nanosheets encapsulated in rGO network and the mitigated volume expansion of the anode owing to its robust 3D hierarchical nanostructure. |
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| Keywords: | 3D hierarchical nanostructures anodes Cu2O/CuO/rGO nanosheets lithium‐ion batteries single‐step hydrothermal synthesis |
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