Beads-Milling of Waste Si Sawdust into High-Performance Nanoflakes for Lithium-Ion Batteries
| Autor: | Hirotomo Nishihara, Makoto Okai, Taketoshi Matsumoto, Hikaru Kobayashi, Takashi Kyotani, Takatoshi Kasukabe, Katsuya Kimura |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Multidisciplinary
Materials science Silicon chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Article 0104 chemical sciences Ion Anode Chemical engineering chemistry visual_art visual_art.visual_art_medium Wafer Lithium Sawdust 0210 nano-technology Porosity Faraday efficiency |
| Zdroj: | Scientific Reports |
| ISSN: | 2045-2322 |
| Popis: | Nowadays, ca. 176,640 tons/year of silicon (Si) (>4N) is manufactured for Si wafers used for semiconductor industry. The production of the highly pure Si wafers inevitably includes very high-temperature steps at 1400–2000 °C, which is energy-consuming and environmentally unfriendly. Inefficiently, ca. 45–55% of such costly Si is lost simply as sawdust in the cutting process. In this work, we develop a cost-effective way to recycle Si sawdust as a high-performance anode material for lithium-ion batteries. By a beads-milling process, nanoflakes with extremely small thickness (15–17 nm) and large diameter (0.2–1 μm) are obtained. The nanoflake framework is transformed into a high-performance porous structure, named wrinkled structure, through a self-organization induced by lithiation/delithiation cycling. Under capacity restriction up to 1200 mAh g−1, the best sample can retain the constant capacity over 800 cycles with a reasonably high coulombic efficiency (98–99.8%). |
| Databáze: | OpenAIRE |
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