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H2V3O8 as a High Energy Cathode Material for Nonaqueous Magnesium-Ion Batteries

Title
H2V3O8 as a High Energy Cathode Material for Nonaqueous Magnesium-Ion Batteries
Authors
Rastgoo-Deylami, MohadeseChae, Munseok S.Hong, Seung-Tae
DGIST Authors
Hong, Seung-Tae
Issue Date
2018-11
Citation
Chemistry of Materials, 30(21), 7464-7472
Type
Article
Article Type
Article
ISSN
0897-4756
Abstract
Magnesium-ion batteries (MIBs) suffer from a low energy density of cathode materials in a conventional nonaqueous electrolyte, contrary to the expectation due to the divalent Mg ion. Here, we report H2V3O8, or V3O7·H2O, as a high-energy cathode material for MIBs. It exhibits reversible magnesiation-demagnesiation behavior with an initial discharge capacity of 231 mAh g-1 at 60 °C, and an average discharge voltage of 1.9 V vs Mg/Mg2+ in an electrolyte of 0.5 M Mg(ClO4)2 in acetonitrile, resulting in a high energy density of 440 Wh kg-1. The structural water remains stable during cycling. The crystal structure for Mg0.97H2V3O8 is determined for the first time. Bond valence sum difference mapping shows facile conduction pathways for Mg ions in the structure. The high performance of this material with its distinct crystal structure employing water-metal bonding and hydrogen bonding provides insights to search for new oxide-based stable and high-energy materials for MIBs. © 2018 American Chemical Society.
URI
http://hdl.handle.net/20.500.11750/9401
DOI
10.1021/acs.chemmater.8b01381
Publisher
American Chemical Society
Related Researcher
  • Author   Discovery Lab(Batteries & Materials Discovery Laboratory)
  • Research Interests
Files:
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Collection:
Department of Energy Science and EngineeringDiscovery Lab(Batteries & Materials Discovery Laboratory)1. Journal Articles


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