Investigating the Reversibility of in Situ Generated Magnesium Organohaloalurninates for Magnesium Deposition and Dissolution

被引：71

作者：

Barile, Christopher J. ^{[1
]}

Spatney, Russell ^{[1
]}

Zavadil, Kevin R. ^{[2
]}

Gewirth, Andrew A. ^{[1
]}

机构：

[1] Univ Illinois, Dept Chem, Urbana, IL 61801 USA

[2] Sandia Natl Labs, Albuquerque, NM 87185 USA

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2014年 / 118卷 / 20期

基金：

美国国家科学基金会;

关键词：

ELECTROLYTE-SOLUTIONS; PROGRESS; SYSTEMS; SALTS;

D O I：

10.1021/jp503506c

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We compare the electrochemistry of Mg deposition and stripping from Mg(AlCl2EtBu)(2) in THF, a common electrolyte used in Mg-ion battery prototypes, with EtMgBr, a simple Grignard reagent. Electrochemical quartz crystal microbalance measurements demonstrate that mass is gained and lost from the electrode with relatively high efficiency. However, the corresponding Coulombic efficiency is considerably less than the expected 100% for early stage cycles. SEM-EDS analysis shows accumulation of Mg and electrolyte constituents after stripping, highlighting the irreversibility of the Mg deposition and stripping process. GC-MS and NMR analysis of electrolytes reveal decomposition of the solvent-electrolyte system. These findings suggest that Mg organohaloaluminates are not ideal for use in robust Mg-ion batteries.

引用

页码：10694 / 10699

页数：6