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Hollow carbon nanospheres/silicon/alumina core-shell film as an anode for lithium-ion batteries
Hollow carbon nanospheres/silicon/alumina (CNS/Si/Al(2)O(3)) core-shell films obtained by the deposition of Si and Al(2)O(3) on hollow CNS interconnected films are used as the anode materials for lithium-ion batteries. The hollow CNS film acts as a three dimensional conductive substrate and provides...
Autores principales: | , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group
2015
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4288231/ https://www.ncbi.nlm.nih.gov/pubmed/25564245 http://dx.doi.org/10.1038/srep07659 |
Sumario: | Hollow carbon nanospheres/silicon/alumina (CNS/Si/Al(2)O(3)) core-shell films obtained by the deposition of Si and Al(2)O(3) on hollow CNS interconnected films are used as the anode materials for lithium-ion batteries. The hollow CNS film acts as a three dimensional conductive substrate and provides void space for silicon volume expansion during electrochemical cycling. The Al(2)O(3) thin layer is beneficial to the reduction of solid-electrolyte interphase (SEI) formation. Moreover, as-designed structure holds the robust surface-to-surface contact between Si and CNSs, which facilitates the fast electron transport. As a consequence, the electrode exhibits high specific capacity and remarkable capacity retention simultaneously: 1560 mA h g(−1) after 100 cycles at a current density of 1 A g(−1) with the capacity retention of 85% and an average decay rate of 0.16% per cycle. The superior battery properties are further confirmed by cyclic voltammetry (CV) and impedance measurement. |
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