Researchers have created a high performance anode material for lithium-ion batteries (LIBs) using waste silicon (Si) sawdust.
It is energy-consuming and expensive to produce Si wafers with high purity (> 99.99%). On top of that, some 50% of Si is actually discarded as industrial waste in the final cutting process. This waste is about 90 thousand tons a year worldwide, an amount large enough to meet the global demands for anode materials for LIBs.
To make this happen, under the project of "Dynamic Alliance for Open Innovation Bridging Human, Environment and Materials, " a joint research team from Tohoku University and Osaka University has developed a practical and mass-producible method of recycling the unwanted Si sawdust into a high-performance anode material for LIBs.
The team found that the pulverization of the Si sawdust into Si nanoflakes (~16 nm in thickness) and the subsequent carbon coating are effective in fabricating high capacity and durable LIBs. So far, a test half-cell has achieved a constant capacity of 1200 mAh/g over 800 cycles. This capacity is 3.3 times as large as that of conventional graphite (ca. 360 mAh/g).
The proposed method of material recycling is applicable for the mass production of high-performance LIB anode materials at a reasonably low cost. The research team expects that it will have great practical use in the battery industry.
Materials provided by Tohoku University. Note: Content may be edited for style and length.
- Takatoshi Kasukabe, Hirotomo Nishihara, Katsuya Kimura, Taketoshi Matsumoto, Hikaru Kobayashi, Makoto Okai, Takashi Kyotani. Beads-Milling of Waste Si Sawdust into High-Performance Nanoflakes for Lithium-Ion Batteries. Scientific Reports, 2017; 7: 42734 DOI: 10.1038/srep42734
Cite This Page:
Tohoku University. "Waste silicon sawdust recycled into anode for lithium-ion battery." ScienceDaily. ScienceDaily, 21 February 2017. .
Tohoku University. (2017, February 21). Waste silicon sawdust recycled into anode for lithium-ion battery. ScienceDaily. Retrieved May 31, 2017 from
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