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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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Three dimensional (3D) porous structures consisting of Cu@CoO core-shell-type nano-dendrites were synthesized and tested as the anode materials in lithium secondary batteries. For this purpose, first, the 3D porous films comprising Cu@Co core-shell-type nano-dendrites with various thicknesses were fabricated through the electrochemical co-deposition of Cu and Co. Then the Co shells were selectively anodized to form Co hydroxides, which was finally dehydrated to get Cu@CoO nanodendrites. The resulting electrodes exhibited very high reversible specific capacity almost 1.4~2.4 times the theoretical capacity of commercial graphite, and excellent capacity retention (~90%@50<SUP>th</SUP> cycle) as compared with those of the existing transition metal oxides. From the analysis of the cumulative irreversible capacity and morphology change during charge/discharge cycling, it proved that the excellent capacity retention was attributed to the unique structural feature of our core-shell structure where only the thin CoO shell participates in the lithium storage. In addition, our electrodes showed a superb rate performance (70.5%@10.8 C-rate), most likely due to the open porous structure of 3D films, large surface area thanks to the dendritic structure, and fast electron transport through Cu core network.
목차
Abstract
1. 서론
2. 실험 방법
3. 실험 결과
4. 결론
References
참고문헌 (38)
참고문헌 신청
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H. H. Li, Z. Y. Li, X. L. Wu, L. L. Zhang, C. Y. Fan, H. F. Wang, X. Y. Li, K. Wang, H. Z. Sun, J. P. Zhang, Shale-like Co3O4 for high performance lithium/sodium ion batteries, J. Mater. Chem. A, 4 (2016) 8242-8248.
S. Han, B. Jang, T. Kim, S.M. Oh, T. Hyeon, Simple synthesis of hollow tin dioxide microspheres and their application to lithium-ion battery anodes, Adv. Funct. Mater., 15 (2005) 1845-1850.
K. Peng, J. Jie, W. Zhang, S. T. Lee, Silicon nanowires for rechargeable lithium-ion battery anodes, Appl. Phy. Lett., 93 (2008) 033105.
Y. Yao, M. T. McDowell, I. Ryu, H. Wu, N. Liu, L. Hu, W.D. Nix, Y. Cui, Interconnected silicon hollow nanospheres for lithium-ion battery anodes with long cycle life, Nano Lett., 11 (2011) 2949-2954.
H. H. Li, Z. Y. Li, X. L. Wu, L. L. Zhang, C. Y. Fan, H. F. Wang, X. Y. Li, K. Wang, H. Z. Sun, J. P. Zhang, Shale-like Co3O4 for high performance lithium/sodium ion batteries, J. Mater. Chem. A, 4 (2016) 8242-8248.
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