Experimental visualization of reversible magnesium storage and surface chemistry of magnesium silicide anode

Abstract Magnesium silicide (Mg2Si) is a new anode material candidate for Mg‐ion batteries due to the Earth‐abundance of Mg and Si and its high theoretical specific capacity of 1398 mAh/g. However, to date, no one reported its reversible Mg‐storage ability. Herein, we demonstrate for the first time...

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Autores principales:	Van‐Kien Hoang, Gyeong Jun Chung, Min‐Geun Oh, Seung‐Wan Song
Formato:	article
Lenguaje:	EN
Publicado:	Wiley-VCH 2021
Materias:	anode magnesium silicide Mg2+‐diffusivity Mg‐ion battery surface chemistry Industrial electrochemistry TP250-261 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/b06dfd8f06a6498e93f8df924a8a431a
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spelling	oai:doaj.org-article:b06dfd8f06a6498e93f8df924a8a431a2021-11-23T18:05:25ZExperimental visualization of reversible magnesium storage and surface chemistry of magnesium silicide anode2698-597710.1002/elsa.202000033https://doaj.org/article/b06dfd8f06a6498e93f8df924a8a431a2021-11-01T00:00:00Zhttps://doi.org/10.1002/elsa.202000033https://doaj.org/toc/2698-5977Abstract Magnesium silicide (Mg2Si) is a new anode material candidate for Mg‐ion batteries due to the Earth‐abundance of Mg and Si and its high theoretical specific capacity of 1398 mAh/g. However, to date, no one reported its reversible Mg‐storage ability. Herein, we demonstrate for the first time the experimental visualization of a reversible electrochemical demagnesiation and magnasiation of Mg2Si film model electrode in a half‐cell with the electrolyte of PhMgCl/THF at room temperature. The Mg2+‐diffusivity, 1.3 × 10–18 cm2/s, of Mg2Si film model electrode determined with cyclic voltammetry is four orders of magnitude lower than that of Li+‐diffusivity of Mg2Si film electrode in a lithium cell, indicating a sluggish diffusion kinetics. Surface chemistry studies of the 1st discharged (demagnesiated) and the 1st cycled (re‐magnesiated) electrodes utilizing X‐ray photoelectron spectroscopy reveal that the surface of pristine Mg2Si is highly covered by various silicon oxides, and Mg2Si undergoes segregation and phase separation partly to Mg and Si along with the surface coverage of electrolyte decomposition products. Those events lower the homogeneity and connectivity of electrode composition, which limits the reaction reversibility. The data give insight into a new material design for Mg‐ion batteries.Van‐Kien HoangGyeong Jun ChungMin‐Geun OhSeung‐Wan SongWiley-VCHarticleanodemagnesium silicideMg2+‐diffusivityMg‐ion batterysurface chemistryIndustrial electrochemistryTP250-261ChemistryQD1-999ENElectrochemical Science Advances, Vol 1, Iss 4, Pp n/a-n/a (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	anode magnesium silicide Mg2+‐diffusivity Mg‐ion battery surface chemistry Industrial electrochemistry TP250-261 Chemistry QD1-999
spellingShingle	anode magnesium silicide Mg2+‐diffusivity Mg‐ion battery surface chemistry Industrial electrochemistry TP250-261 Chemistry QD1-999 Van‐Kien Hoang Gyeong Jun Chung Min‐Geun Oh Seung‐Wan Song Experimental visualization of reversible magnesium storage and surface chemistry of magnesium silicide anode
description	Abstract Magnesium silicide (Mg2Si) is a new anode material candidate for Mg‐ion batteries due to the Earth‐abundance of Mg and Si and its high theoretical specific capacity of 1398 mAh/g. However, to date, no one reported its reversible Mg‐storage ability. Herein, we demonstrate for the first time the experimental visualization of a reversible electrochemical demagnesiation and magnasiation of Mg2Si film model electrode in a half‐cell with the electrolyte of PhMgCl/THF at room temperature. The Mg2+‐diffusivity, 1.3 × 10–18 cm2/s, of Mg2Si film model electrode determined with cyclic voltammetry is four orders of magnitude lower than that of Li+‐diffusivity of Mg2Si film electrode in a lithium cell, indicating a sluggish diffusion kinetics. Surface chemistry studies of the 1st discharged (demagnesiated) and the 1st cycled (re‐magnesiated) electrodes utilizing X‐ray photoelectron spectroscopy reveal that the surface of pristine Mg2Si is highly covered by various silicon oxides, and Mg2Si undergoes segregation and phase separation partly to Mg and Si along with the surface coverage of electrolyte decomposition products. Those events lower the homogeneity and connectivity of electrode composition, which limits the reaction reversibility. The data give insight into a new material design for Mg‐ion batteries.
format	article
author	Van‐Kien Hoang Gyeong Jun Chung Min‐Geun Oh Seung‐Wan Song
author_facet	Van‐Kien Hoang Gyeong Jun Chung Min‐Geun Oh Seung‐Wan Song
author_sort	Van‐Kien Hoang
title	Experimental visualization of reversible magnesium storage and surface chemistry of magnesium silicide anode
title_short	Experimental visualization of reversible magnesium storage and surface chemistry of magnesium silicide anode
title_full	Experimental visualization of reversible magnesium storage and surface chemistry of magnesium silicide anode
title_fullStr	Experimental visualization of reversible magnesium storage and surface chemistry of magnesium silicide anode
title_full_unstemmed	Experimental visualization of reversible magnesium storage and surface chemistry of magnesium silicide anode
title_sort	experimental visualization of reversible magnesium storage and surface chemistry of magnesium silicide anode
publisher	Wiley-VCH
publishDate	2021
url	https://doaj.org/article/b06dfd8f06a6498e93f8df924a8a431a
work_keys_str_mv	AT vankienhoang experimentalvisualizationofreversiblemagnesiumstorageandsurfacechemistryofmagnesiumsilicideanode AT gyeongjunchung experimentalvisualizationofreversiblemagnesiumstorageandsurfacechemistryofmagnesiumsilicideanode AT mingeunoh experimentalvisualizationofreversiblemagnesiumstorageandsurfacechemistryofmagnesiumsilicideanode AT seungwansong experimentalvisualizationofreversiblemagnesiumstorageandsurfacechemistryofmagnesiumsilicideanode
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Experimental visualization of reversible magnesium storage and surface chemistry of magnesium silicide anode

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