Reaction mechanism and enhancement of cyclability of SiO anodes by surface etching with NaOH for Li-ion batteries

Byeong Chul Yu; Yoon Hwa; Cheol Min Park; Hun Joon Sohn

doi:10.1039/c3ta00045a

Reaction mechanism and enhancement of cyclability of SiO anodes by surface etching with NaOH for Li-ion batteries

Byeong Chul Yu, Yoon Hwa, Cheol Min Park, Hun Joon Sohn

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

101 Scopus citations

Abstract

SiO has been considered as one of the most promising anodes, the reaction mechanism of SiO with Li is still not well understood. High energy mechanical milling (HEMM) followed by etching of the SiO surface with NaOH solution was carried out in this study to enhance cycle performance. X-ray photoelectron spectroscopy (XPS) analyses showed the different compositions of the Si valence state before and after sputtering, and the atomic ratio of O/Si at the surface differed from that of the inside bulk SiO. Using high resolution transmission electron microscopy (HRTEM), the reaction mechanism of a SiO electrode was investigated. During the first discharge, Li₂Si₂O ₅ and Li₆Si₂O₇ phases were identified as well as Li₄SiO₄ and Li rich amorphous binary Li_xSi phases. The surface etched SiO showed significantly better cyclability with the reversible capacity of 1260 mA h g^-1 over 50 cycles.

Original language	English (US)
Pages (from-to)	4820-4825
Number of pages	6
Journal	Journal of Materials Chemistry A
Volume	1
Issue number	15
DOIs	https://doi.org/10.1039/c3ta00045a
State	Published - Apr 21 2013
Externally published	Yes

ASJC Scopus subject areas

Chemistry(all)
Renewable Energy, Sustainability and the Environment
Materials Science(all)

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10.1039/c3ta00045a

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title = "Reaction mechanism and enhancement of cyclability of SiO anodes by surface etching with NaOH for Li-ion batteries",

abstract = "SiO has been considered as one of the most promising anodes, the reaction mechanism of SiO with Li is still not well understood. High energy mechanical milling (HEMM) followed by etching of the SiO surface with NaOH solution was carried out in this study to enhance cycle performance. X-ray photoelectron spectroscopy (XPS) analyses showed the different compositions of the Si valence state before and after sputtering, and the atomic ratio of O/Si at the surface differed from that of the inside bulk SiO. Using high resolution transmission electron microscopy (HRTEM), the reaction mechanism of a SiO electrode was investigated. During the first discharge, Li2Si2O 5 and Li6Si2O7 phases were identified as well as Li4SiO4 and Li rich amorphous binary LixSi phases. The surface etched SiO showed significantly better cyclability with the reversible capacity of 1260 mA h g-1 over 50 cycles.",

author = "Yu, {Byeong Chul} and Yoon Hwa and Park, {Cheol Min} and Sohn, {Hun Joon}",

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T1 - Reaction mechanism and enhancement of cyclability of SiO anodes by surface etching with NaOH for Li-ion batteries

AU - Yu, Byeong Chul

AU - Hwa, Yoon

AU - Park, Cheol Min

AU - Sohn, Hun Joon

PY - 2013/4/21

Y1 - 2013/4/21

N2 - SiO has been considered as one of the most promising anodes, the reaction mechanism of SiO with Li is still not well understood. High energy mechanical milling (HEMM) followed by etching of the SiO surface with NaOH solution was carried out in this study to enhance cycle performance. X-ray photoelectron spectroscopy (XPS) analyses showed the different compositions of the Si valence state before and after sputtering, and the atomic ratio of O/Si at the surface differed from that of the inside bulk SiO. Using high resolution transmission electron microscopy (HRTEM), the reaction mechanism of a SiO electrode was investigated. During the first discharge, Li2Si2O 5 and Li6Si2O7 phases were identified as well as Li4SiO4 and Li rich amorphous binary LixSi phases. The surface etched SiO showed significantly better cyclability with the reversible capacity of 1260 mA h g-1 over 50 cycles.

AB - SiO has been considered as one of the most promising anodes, the reaction mechanism of SiO with Li is still not well understood. High energy mechanical milling (HEMM) followed by etching of the SiO surface with NaOH solution was carried out in this study to enhance cycle performance. X-ray photoelectron spectroscopy (XPS) analyses showed the different compositions of the Si valence state before and after sputtering, and the atomic ratio of O/Si at the surface differed from that of the inside bulk SiO. Using high resolution transmission electron microscopy (HRTEM), the reaction mechanism of a SiO electrode was investigated. During the first discharge, Li2Si2O 5 and Li6Si2O7 phases were identified as well as Li4SiO4 and Li rich amorphous binary LixSi phases. The surface etched SiO showed significantly better cyclability with the reversible capacity of 1260 mA h g-1 over 50 cycles.

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Reaction mechanism and enhancement of cyclability of SiO anodes by surface etching with NaOH for Li-ion batteries

Abstract

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