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Low‐Temperature Molten‐Salt Production of Silicon Nanowires by the Electrochemical Reduction of CaSiO3

Abstract

Silicon is an extremely important technological material, but its current industrial production by the carbothermic reduction of SiO2 is energy intensive and generates CO2 emissions. Herein, we developed a more sustainable method to produce silicon nanowires (Si NWs) in bulk quantities through the direct electrochemical reduction of CaSiO3, an abundant and inexpensive Si source soluble in molten salts, at a low temperature of 650 °C by using low‐melting‐point ternary molten salts CaCl2–MgCl2–NaCl, which still retains high CaSiO3 solubility, and a supporting electrolyte of CaO, which facilitates the transport of O2− anions, drastically improves the reaction kinetics, and enables the electrolysis at low temperatures. The Si nanowire product can be used as high‐capacity Li‐ion battery anode materials with excellent cycling performance. This environmentally friendly strategy for the practical production of Si at lower temperatures can be applied to other molten salt systems and is also promising for waste glass and coal ash recycling.

Altglas zu Batterien: Eine neue Methode zur Produktion von Silicium‐Nanodrähten basiert auf der direkten elektrochemischen Reduktion von CaSiO3 bei 650 °C. Die Methode verwendet niedrig schmelzende ternäre Salze CaCl2‐MgCl2‐NaCl, die eine hohe Löslichkeit für CaSiO3 aufweisen, sowie einen Hilfselektrolyten, CaO, der die Reaktionskinetik verbessert und die Elektrolyse bei vergleichsweise niedrigen Temperaturen ermöglicht.

Authors:   Yifan Dong, Tylor Slade, Matthew J Stolt, Linsen Li, Steven N Girard, Liqiang Mai, Song Jin; Yifan Dong, Tyler Slade, Matthew J. Stolt, Linsen Li, Steven N. Girard, Liqiang Mai, Song Jin
Journal:   Angewandte Chemie
Volume:   129
edition:   46
Year:   2017
Pages:   14645
DOI:   10.1002/ange.201707064
Publication date:   18-Oct-2017
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