Scientists use silicon dust to make high-performance lithium-ion battery anodes
In the electronics industry, when a small wafer is cut from a large wafer, it often produces large amounts of debris. Usually these materials will be discarded, but thanks to a research currently being carried out by Tohoku University and Osaka University, these silicon debris will soon be used in the field of high-performance lithium-ion batteries. The scientists started with ordinary silica dust, washed away impurities (such as coolants used during the cutting process), made them into about 15nm thick powders, wrapped them with carbon, and finally made the anode of the battery.
Recycling process diagram.
Tests have shown that a lithium-ion semi-dry cell using this anode material can have a unit capacity of 1200 mAh/g (milliampere-hours per gram) and a cycle time of over 800 cycles.
For outsiders, this number may not be obvious. In fact, its performance is 3.3 times that of traditional graphite anodes.
The researchers pointed out that if mass production, the scale of the recovery process will be more simple, and the cost of the anode will become quite low. They expect that the industry's annual silicon dust will be sufficient for global demand for anode materials.
Details of this study have been published in the recently published "Scientific Reports" journal.
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