Enhancement of the cyclability of a Si anode through Co3O 4 coating by the sol-gel method

Yoon Hwa; Won Sik Kim; Byeong Chul Yu; Seong Hyeon Hong; Hun Joon Sohn

doi:10.1021/jp401333v

Enhancement of the cyclability of a Si anode through Co₃O ₄ coating by the sol-gel method

Yoon Hwa, Won Sik Kim, Byeong Chul Yu, Seong Hyeon Hong, Hun Joon Sohn

Research output: Contribution to journal › Article › peer-review

48 Scopus citations

Abstract

A nano-Si/Co₃O₄ core-shell nanostructured material has been successfully prepared using the sol-gel method. The reaction mechanism between Li and the nano-Si/Co₃O₄ core-shell nanostructured electrode was investigated by ex situ analyses. Metallic Co, Li ₂₁Si₈, and amorphous Li₂O phases were formed when fully lithiated, and an amorphous Si, Co₃O₄, and Co phases were identified after charge, indicating that the Co₃O ₄ was partially reversible. The nano-Si/Co₃O₄ core-shell nanostructured electrode showed excellent cyclability, with a reversible capacity of ca. 850 mAh/g over 100 cycles.

Original language	English (US)
Pages (from-to)	7013-7017
Number of pages	5
Journal	Journal of Physical Chemistry C
Volume	117
Issue number	14
DOIs	https://doi.org/10.1021/jp401333v
State	Published - Apr 11 2013
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
General Energy
Physical and Theoretical Chemistry
Surfaces, Coatings and Films

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title = "Enhancement of the cyclability of a Si anode through Co3O 4 coating by the sol-gel method",

abstract = "A nano-Si/Co3O4 core-shell nanostructured material has been successfully prepared using the sol-gel method. The reaction mechanism between Li and the nano-Si/Co3O4 core-shell nanostructured electrode was investigated by ex situ analyses. Metallic Co, Li 21Si8, and amorphous Li2O phases were formed when fully lithiated, and an amorphous Si, Co3O4, and Co phases were identified after charge, indicating that the Co3O 4 was partially reversible. The nano-Si/Co3O4 core-shell nanostructured electrode showed excellent cyclability, with a reversible capacity of ca. 850 mAh/g over 100 cycles.",

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AU - Hwa, Yoon

AU - Kim, Won Sik

AU - Yu, Byeong Chul

AU - Hong, Seong Hyeon

AU - Sohn, Hun Joon

PY - 2013/4/11

Y1 - 2013/4/11

N2 - A nano-Si/Co3O4 core-shell nanostructured material has been successfully prepared using the sol-gel method. The reaction mechanism between Li and the nano-Si/Co3O4 core-shell nanostructured electrode was investigated by ex situ analyses. Metallic Co, Li 21Si8, and amorphous Li2O phases were formed when fully lithiated, and an amorphous Si, Co3O4, and Co phases were identified after charge, indicating that the Co3O 4 was partially reversible. The nano-Si/Co3O4 core-shell nanostructured electrode showed excellent cyclability, with a reversible capacity of ca. 850 mAh/g over 100 cycles.

AB - A nano-Si/Co3O4 core-shell nanostructured material has been successfully prepared using the sol-gel method. The reaction mechanism between Li and the nano-Si/Co3O4 core-shell nanostructured electrode was investigated by ex situ analyses. Metallic Co, Li 21Si8, and amorphous Li2O phases were formed when fully lithiated, and an amorphous Si, Co3O4, and Co phases were identified after charge, indicating that the Co3O 4 was partially reversible. The nano-Si/Co3O4 core-shell nanostructured electrode showed excellent cyclability, with a reversible capacity of ca. 850 mAh/g over 100 cycles.

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Enhancement of the cyclability of a Si anode through Co₃O ₄ coating by the sol-gel method

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