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Recent developments in the field of low-temperature electrolytes and electrolysis are considered. Although the investigations have not found fundamental problems in low-temperature aluminum electrolysis development as an industrial process, challenges remain in cell design, construction, and operation of cells with these emerging technologies.

The silicon electrodeposition from the KF-KCl-(10 mol%) K2SiF6 melt at 943–1103 K has been studied. The polycrystalline continuous single-phase silicon coatings (∼99.9 wt% Si) have been obtained on the graphite, glassy carbon, silver, and tungsten substrates. The Raman spectroscopic study of the Si/C and Si/Ag interfaces has proved an absence of the intermediate phases. Two phases (Si and Ni2Si) were formed during the silicon electrodeposition on nickel.

The electrical conductivity of low temperature electrolytes for aluminum electrolysis has been measured. The potassium cryolite was the basic melt. Additions of LiF and NaF increased the conductivity of (KF +AlF3) molten mixtures but Al2O3 decreased it.

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The solubility of silica in fluoride–chloride electrolytes for use in the electrolysis of solar-grade silicon was studied. The visual method was used for the investigation. Liquidus temperatures were investigated by thermal analysis. The silica solubility rises with KF content and temperature. The densities of the compositions with high silica solubility were determined.

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