Application of nanostructured silicon (nSi) is significantly retarded by challenges in the production of affordable nSi. We herein report a high‐yield (ca. 100 %) and low‐energy (2 kWh Kg‐nSi−1) nanostructuring of industrial microsized s...
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https://www.riss.kr/link?id=O120453924
2018년
-
1433-7851
1521-3773
SCI;SCIE;SCOPUS
학술저널
15743-15748 [※수록면이 p5 이하이면, Review, Columns, Editor's Note, Abstract 등일 경우가 있습니다.]
0
상세조회0
다운로드다국어 초록 (Multilingual Abstract)
Application of nanostructured silicon (nSi) is significantly retarded by challenges in the production of affordable nSi. We herein report a high‐yield (ca. 100 %) and low‐energy (2 kWh Kg‐nSi−1) nanostructuring of industrial microsized s...
Application of nanostructured silicon (nSi) is significantly retarded by challenges in the production of affordable nSi. We herein report a high‐yield (ca. 100 %) and low‐energy (2 kWh Kg‐nSi−1) nanostructuring of industrial microsized silicon (mSi) through a closed‐loop electrochemical Mg alloying/dealloying in molten MgCl2/NaCl/KCl at 773 K. The resulting nSi unexpectedly shows a salt‐unwetted character, allowing an automatic separation from the melts. Thus water washing and accompanying oxidation of the nSi can be avoided. The final product has a nanoporous structure and comprises Si nanorods (ca. 30 nm in diameter) with an ultrathin oxide coating. It can be used for Li storage giving a combination of high initial coulombic efficiency, high specific capacity, and long cycling stability. This nanostructuring process consumes very few chemicals except for the mSi and produces almost zero waste.
Bulk silicon can be nanostructured in a comparatively low‐energy and environmentally benign approach of electrochemical Mg alloying/dealloying in molten salts at moderate temperatures. For lithium storage, the nanostructured Si exhibits a combination of high initial Coulombic efficiency, high specific capacity, and long cycling stability.
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