Graphene oxide nano-sheets wrapped Cu2O microspheres as improved performance anode materials for lithium ion batteries
Publication in refereed journal

香港中文大學研究人員

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摘要Cu2O microspheres were successfully encapsulated by graphene oxide (GO) nano-sheets and used directly as the anode material for lithium ion batteries. The core-shell structured Cu2O@GO composite delivered a reversible capacity of 458 mA h g(-1) at a current density of 100 mA g(-1) after 50 cycles. Even at a high charge-discharge rate of 1000 mA g(-1), Cu2O@GO still demonstrated a reversible capacity of 240 mA h g(-1) after 200 cycles, significantly higher than those of the bare Cu2O microspheres (37 mA h g(-1)) and GO nano-sheets (11 mA h g(-1)). The rate capability evaluated by the ratio of capacity at 100 mA g(-1)/1000 mA g(-1) current density was 49%, 25% and 9.8% for Cu2O@GO, bare Cu2O and GO, respectively. The greatly enhanced performance for GO nano-sheets wrapped Cu2O microspheres composite mainly resulted from the synergistic effect of Cu2O microspheres and GO nano-sheets core-shell composite: the flexible in-situ electrochemically reduced GO nano-sheet coating layer functioning as an efficient three dimensional (3D) conductive network and lithium storage active material; the Cu2O microsphere core functioning as a skeleton to support multilayer GO sheets and avoid GO nano-sheets aggregation. (C) 2014 Elsevier Ltd. All rights reserved.
著者Xu YT, Guo Y, Li C, Zhou XY, Tucker MC, Fu XZ, Sun R, Wong CP
期刊名稱Nano Energy
出版年份2015
月份1
卷號11
出版社ELSEVIER SCIENCE BV
頁次38 - 47
國際標準期刊號2211-2855
電子國際標準期刊號2211-3282
語言英式英語
關鍵詞3D; Anode materials; Cu2O microspheres; Graphene oxide nano-sheets; In-situ electrochemical reduction; Lithium ion batteries
Web of Science 學科類別Chemistry; Chemistry, Physical; Materials Science; Materials Science, Multidisciplinary; Nanoscience & Nanotechnology; Physics; Physics, Applied; Science & Technology - Other Topics

上次更新時間 2021-17-01 於 01:51