Scientists from NTU Singapore have developed an efficient method to recover high-purity silicon from expired solar panels, enabling them to produce lithium-ion batteries.
The silicon produced from those parts is of insufficient quality; thus, a solution was devised to recycle old solar panels safely.
“Our approach to silicon recovery is both efficient and effective. We do not have to use multiple chemicals, reducing the time spent on post-treatment of the chemical wastes. At the same time, we achieved a high recovery rate of pure silicon comparable to those produced by energy-intensive extraction techniques.”
The process of manufacturing the silicon for advanced EVs involves soaking expired solar cells in hot diluted phosphoric acid for 30 minutes. As a consequence, the recovered silicon, when upcycled into a lithium-ion battery anode, performed as well as a brand new commercially purchased silicon.Dr. Sim Ying, Research Fellow, Energy Research Institute, stated:
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