Preparation and Electrochemical Properties of Si@C/Graphite Composite as Anode for Lithium-Ion Batteries
| Autor: | Wei Ruan, Ling Huang, Tai Sun, Ren Heng Tang, Fang Ming Xiao, Ying Wang |
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| Rok vydání: | 2019 |
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Thesaurus (information retrieval)
Materials science Chemical substance Mechanical Engineering chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences 0104 chemical sciences Anode Ion Search engine chemistry Chemical engineering Mechanics of Materials General Materials Science Lithium 0210 nano-technology Science technology and society |
| Zdroj: | Key Engineering Materials. 807:74-81 |
| ISSN: | 1662-9795 |
| DOI: | 10.4028/www.scientific.net/kem.807.74 |
| Popis: | In this study, Si@C/Graphite composite anodes were synthesized through spray drying and pyrolysis using silica, artificial graphite, and two kinds of organics (phenolic resin or pitch). The Si@PR-C/Graphite exhibits enhanced electrochemical performance for lithium-ion batteries. The first charge-discharge specific capacity is 512.8mAh/g and 621.8mAh/g, respectively, the initial coulombic efficiency is 82.5% at 100mA/g, and its capacity retention rate reached as high as 85.4% with the capacity fade rate of less than 0.18% per cycle after 85 cycles. The Si@PI-C/Graphite also presents excellent discharge specific capacity of 702.8mAh/g with the capacity retention rate of 76.9% after 30 cycles. Mechanisms for high electrochemical performances of the Si@C/Graphite composite anode are discussed. It found that the enhanced electrochemical performance due to the formation of core/shell microstructure. These encouraging experimental results suggest that proper organic carbon source has great potential for improvement of electrochemical properties of pure silicon as anode. Key words:lithium-ion batteries; anode; Si@C/Graphite composite; electrochemical performance |
| Databáze: | OpenAIRE |
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