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



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
頁次38 - 47
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