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곽상규

Kwak, Sang Kyu
Kyu’s MolSim Lab @ UNIST
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Revealing salt-expedited reduction mechanism for hollow silicon microsphere formation in bi-functional halide melts

Author(s)
Song, GyujinRyu, JaegeonKim, Jin ChulLee, Jeong HyeonKim, SunghoWang, ChongminKwak, Sang KyuPark, Soojin
Issued Date
2018-08
DOI
10.1038/s42004-018-0041-z
URI
https://scholarworks.unist.ac.kr/handle/201301/24555
Fulltext
https://www.nature.com/articles/s42004-018-0041-z
Citation
COMMUNICATIONS CHEMISTRY, v.1, pp.42
Abstract
The thermochemical reduction of silica to silicon using chemical reductants requires high temperature and has a high activation energy, which depends on the melting temperature of the reductant. The addition of bi-functional molten salts with a low melting temperature may reduce the required energy, and several examples using molten salts have been demonstrated. Here we study the mechanism of reduction of silica in the presence of aluminum metal reductant and aluminum chloride as bi-functional molten salts. An aluminum-aluminum chloride complex plays a key role in the reduction mechanism, reacting with the oxygen of the silica surfaces to lower the heat of reaction and subsequently survives a recycling step in the reaction. This experimentally and theoretically validated reaction mechanism may open a new pathway using bi-functional molten salts. Furthermore, the as-synthesized hollow porous silicon microsphere anodes show structural durability on cycling in both half/full cell tests, attributed to the high volume-accommodating ability.
Publisher
NATURE PUBLISHING GROUP
ISSN
2399-3669
Keyword
CHEMICAL-REDUCTIONSCALABLE SYNTHESISMOLTEN-SALTLITHIUMSIELECTRODESGRAPHITENANOPARTICLESCAPACITYANODES

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