Preparation of graphene-like carbon attached porous silicon anode by magnesiothermic and nickel-catalyzed reduction reactions
| Autor: | Tianyu Feng, Peixia Yang, Yuefei Chen, Jinqiu Zhang, Xueqin Chen, Maozhong An |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Silicon Graphene General Chemical Engineering Composite number General Engineering General Physics and Astronomy chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Porous silicon 01 natural sciences 0104 chemical sciences law.invention Anode Catalysis Nickel chemistry Chemical engineering law General Materials Science 0210 nano-technology Carbon |
| Zdroj: | Ionics. 26:5941-5950 |
| ISSN: | 1862-0760 0947-7047 |
| DOI: | 10.1007/s11581-020-03746-8 |
| Popis: | For improving performance of silicon anode in lithium ion batteries, a two-step preparation method was applied for synthesis of silicon carbon powder. The first step was to prepare Si/Ni composite powder by magnesiothermic reduction reaction in which Tetraethoxysilane (TEOS) was silicon source and NiCl2∙6H2O was nickel source. The second step was to prepare silicon carbon in which triethylene glycol was carbon source and reduced by nickel catalyzed reactions on the surface of Si/Ni composite particles. Strawberry-like porous silicon attached with graphene-like carbon was found in the sample of Si-C powder treated by 1 M FeCl3 and 5 wt.% HF. Charge/discharge performance of anode materials were measured in button cells. The highest discharge specific capacity of Si-C powder can reach to 1275 mAh g−1, but the cycle performance was not as good as Si/Ni composite powder. At the 50th cycle, the discharge specific capacity of Si/Ni composite powders and Si-C powders were 415 mAh g−1 and 395 mAh g−1, respectively. |
| Databáze: | OpenAIRE |
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