Morphology Change Of Si Deposit In Molten Salt Electrorefining

Archives of Metallurgy and Materials

J.S. Lee¹  Y.S. An¹  M.H. Han²  H.Y. Ryu²  S.C. Kwon²  J.H. Lee² 

[1]ENERGY MATERIALS CENTER, KOREA INSTITUTE OF ENERGY RESEARCH, 152 GAJEONG-RO, YUSEONG-GU, 305-343, DAEJEON, REPUBLIC OF KOREA

[2]GRADUATE SCHOOL OF ENERGY SCIENCE AND TECHNOLOGY

关键词: Keywords: Molten salt;    Silicon;    Morphology;    Electrorefining;    Current density;   

DOI  :  10.1515/amm-2015-0159

学科分类：金属与冶金

来源: Akademia Gorniczo-Hutnicza im. Stanislawa Staszica / University of Mining and Metallurgy

【 摘 要 】

The effects of processing parameters on the morphology change in a Si deposit recovered by means of molten salt electrorefining are evaluated using electrochemical techniques such as cyclic voltammetry and chronopotentiometry at 800°C. It was found that concentration of K2SiF6 and current density were important parameters in determining deposit size. Higher concentrations of K2SiF6 were effective in coarsening the silicon deposit and decreasing the cell potential. Silicon nanofiber was recovered at 5 wt% of K2SiF6 whereas dense particles were prepared at 30 and 50 wt% of K2SiF6. The morphology of the Si deposit was determined by the concentration of Si in the electrolyte which is related to the formation of crystal and growth of Si. The formation mechanism of the Si deposit was interpreted by using high resolution TEM as well as electrochemical properties.

【 授权许可】

Unknown