Novel Silicon Doped Tin Oxide-Carbon Microspheres as Anode Material for Lithium Ion Batteries: The Multiple Effects Exerted by Doped Si
| Autor: | Ka Wai Wong, Yuanzhong Tan, Ka Ming Ng |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Silicon Lithium vanadium phosphate battery Inorganic chemistry Doping chemistry.chemical_element 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry Tin oxide 01 natural sciences 0104 chemical sciences Anode Biomaterials chemistry General Materials Science Lithium 0210 nano-technology Carbon Biotechnology |
| Zdroj: | Small (Weinheim an der Bergstrasse, Germany). 13(48) |
| ISSN: | 1613-6829 |
| Popis: | Silicon doped tin oxide embedded porous carbon microspheres (Siy Sn1-y Ox @C) are synthesized. It is found that the doped Si not only improves the reversibility of lithiation/delithiation reactions, but also prevents Sn from aggregation. In addition, the doped Si introduces extra defects into the carbon matrix and produces Li+ conductive Li4 SiO4 , which accelerates Li+ diffusion. Together with the conductive, porous carbon matrix that provides void space to accommodate the volume change of Sn during charge/discharge cycling, the novel Siy Sn1-y Ox @C exhibits excellent electrochemical performance. It shows a high initial columbic efficiency of 75.9%. A charge (delithiation) capacity of 880.32 mA h g-1 is retained after 150 cycles, i.e., 91% of the initial capacity. These results indicate that the as-synthesized Siy Sn1-y Ox @C is a promising anode material for lithium ion batteries. |
| Databáze: | OpenAIRE |
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