α-MnO2 as a cathode material for rechargeable Mg batteries

被引：303

作者：

Zhang, Ruigang ^{[2
]}

Yu, Xiqian ^{[1
]}

Nam, Kyung-Wan ^{[1
]}

Ling, Chen ^{[2
]}

Arthur, Timothy S. ^{[2
]}

Song, Wei ^{[2
]}

Knapp, Angela M. ^{[2
]}

Ehrlich, Steven N. ^{[3
]}

Yang, Xiao-Qing ^{[1
]}

Matsui, Masaki ^{[2
]}

机构：

[1] Brookhaven Natl Lab, Dept Chem, Upton, NY 11973 USA

[2] Toyota Res Inst N Amer, Ann Arbor, MI 48105 USA

[3] Brookhaven Natl Lab, Natl Synchrotron Light Source, Upton, NY 11973 USA

来源：

ELECTROCHEMISTRY COMMUNICATIONS | 2012年 / 23卷

关键词：

alpha-MnO2 Mg battery; XPS; XAS; RAY-ABSORPTION SPECTROSCOPY; GEL POLYMER ELECTROLYTE; LITHIUM BATTERIES; MAGNESIUM; OXIDE;

D O I：

10.1016/j.elecom.2012.07.021

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Reversible Mg insertion and extraction behaviors of alpha-MnO2, a promising cathode material for rechargeable Mg batteries, were studied using discharge-charge cycling, X-ray diffraction (XRD). X-ray photoelectron spectroscopy (XPS) and X-ray absorption spectroscopy (XAS). The alpha-MnO2 with a (2 x 2) tunnel structure as cathode shows a reversible capacity about 240 rnAh/g in a cell using Mg metal as anode during the 1st cycle. A reversible reduction/oxidation reaction of Mn ions during the insertion and extraction of Mg ions was clearly observed by both XPS and XAS studies. The extended X-ray absorption fine structure (EXAFS) results show a partial collapse of the tunnel structure in the alpha-MnO2 during the Mg insertion and extraction which might be responsible for the irreversible capacity loss during the 1st cycle. These studies show that alpha-MnO2 is a promising candidate as cathode material for rechargeable Mg batteries if the capacity retention can be significantly improved. (c) 2012 Elsevier B.V. All rights reserved.

引用

页码：110 / 113

页数：4

共 18 条

[1] Prototype systems for rechargeable magnesium batteries [J].