A Double Core-shell Structure Silicon Carbon Composite Anode Material for a Lithium Ion Battery
| Autor: | Hedong Chen, Xiaoqiao Hu, Haiqing Qin, Benli Chu, Xianhua Hou, Qiang Ru, Shimin Huang |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Lithium vanadium phosphate battery Silicon Composite number chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Nanowire battery Lithium-ion battery 0104 chemical sciences Electronic Optical and Magnetic Materials Anode law.invention chemistry Chemical engineering law Graphite 0210 nano-technology Carbon |
| Zdroj: | Silicon. 10:1443-1450 |
| ISSN: | 1876-9918 1876-990X |
| DOI: | 10.1007/s12633-017-9624-z |
| Popis: | Silicon with high theoretical specific capacity is a promising anode material, but the poor electronic conductivity and excessive volume expansion hinder its practical application. In order to solve this problem, a novel double core-shell structure composite Si/G/C-CVD coated by pitch pyrolysis and CVD (Chemical Vapor Deposition) carbon has been prepared. In the Si/G/C-CVD composite, nano-silicon particles and pitch particles are embedded on the surface of graphite particles, then the second carbon layer via CVD is added. The double carbon layer can protect nano-silicon particles from direct exposure to the electrolyte and enhance the electrochemistry performance during the lithium intercalation/extraction process. The as-prepared Si/G/C-CVD composite demonstrates superior electrochemical performance, with enhanced specific reversible capacity (688.44 mAh g−1 at 100 mA g− 1), excellent rate performance (261.66 mAh g−1 even at the specific current of 1.6A g− 1) and good cycle performance with little fading (91% after 155 cycles). |
| Databáze: | OpenAIRE |
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