Journal
WASTE MANAGEMENT
Volume 135, Issue -, Pages 182-189Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.wasman.2021.08.037
Keywords
Waste photovoltaic modules; Porous silicon; Alloying; dealloying; Molten salt; Lithium-ion battery
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Funding
- Xingliao Scholar Project [XLYC1807042]
- Fundamental Research Funds for the Central Universities [N2025035, N2025034]
- Higher Education Discipline Innovation Project [B16009]
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This study utilizes waste crystalline Si solar panels to develop high-performance Si anodes for LIBs, transforming micro-sized Si into porous Si through alloying/dealloying in molten salt. The obtained p-Si serves as an anode in LIBs with great capacity and high capacity retention rate, demonstrating a straightforward way to convert retired Si panels into high-performance anodes while reducing greenhouse gas emissions.
A low-cost and easy-available silicon (Si) feedstock is of great significance for developing high-performance lithium-ion battery (LIB) anode materials. Herein, we employ waste crystalline Si solar panels as silicon raw materials, and transform micro-sized Si (m-Si) into porous Si (p-Si) by an alloying/dealloying approach in molten salt where Li+ was first reduced and simultaneously alloyed with m-Si to generate Li-Si alloy at the cathode. Subsequently, the as-prepared Li-Si alloy served as the anode in the same molten salt to release Li+ into the molten salt, resulting in the production of p-Si by taking advantage of the volume expansion/contraction effect. In the whole process, Li+ was shuttled between the electrodes in molten LiCl-KCl, without consuming Li salt. The obtained p-Si was applied as an anode in a half-type LIBs that delivered a capacity of 2427.7 mAh g+1 at 1 A g+1 after 200 cycles with a capacity retention rate of 91.5% (1383.3 mAh g+1 after 500 cycles). Overall, this work offers a straightforward way to convent waste Si panels to high-performance Si anodes for LIBs, giving retired Si a second life and alleviating greenhouse gas emissions caused by Si production.
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