A high capacity thiospinel cathode for Mg batteries
Date Published |
05/2016
|
---|---|
Publication Type | Journal Article
|
Authors | |
---|---|
DOI |
10.1039/C6EE00724D
|
Abstract |
Magnesium batteries are energy storage systems that potentially offer high energy density owing to their ability to employ magnesium metal as a negative electrode. Their development, however, has been thwarted by a paucity of functional positive electrode materials after the seminal discovery of the Mo6S8 Chevrel phase over 15 years ago. Herein, we report the second such material – a thiospinel – and demonstrate fully reversible Mg2+electrochemical cycling vs. a Mg anode, which is complemented by diffraction and first principles calculations. The capacity approaches 80% of the theoretical value at a practical rate (C/5) at 60 °C, and yields a specific energy of 230 Wh kg−1, twice that of the Chevrel benchmark. Our results emphasize the advantage in employing “soft” anions to achieve practical divalent cation mobility. |
Journal |
Energy & Environmental Science
|
Volume |
9
|
Year of Publication |
2016
|
Issue |
7
|
Pagination |
2273 - 2277
|
ISSN Number |
1754-5692
|
Short Title |
Energy Environ. Sci.
|
Refereed Designation |
Refereed
|
Organizations | |
Download citation |