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Hydrated MgxV5O12 Cathode with Improved Mg2+ Storage Performance

Hydrated MgxV5O12 Cathode with Improved Mg2+ Storage Performance Mg‐ion batteries (MIBs) possess promising advantages over monovalent Li‐ion battery technology. However, one of the myriad obstacles in realizing highly efficient MIBs is a limited selection of cathode materials that can enable reversible, stable Mg2+ intercalation at a high operating voltage. Here, a scalable method is showcased to synthesize a hydrated MgxV5O12 cathode, which shows a high capacity of ≈160 mAh g−1 with a high voltage of 2.1 V, a decent rate capability, and an outstanding cycling life (e.g., 81% capacity retention after 10 000 cycles). The combination of in situ and ex situ characterizations and first‐principles calculations provides evidence of reversible, facile topochemical Mg2+ intercalation into the expanded 2D channels of the hydrated MgxV5O12 cathode, which results from the synergistic effects of Mg2+ pillars and structural H2O. The findings underscore the advantage of the rich but controllable chemistry of vanadium oxide bronzes in achieving practical multivalent cation mobility. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Advanced Energy Materials Wiley

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References (61)

Publisher
Wiley
Copyright
© 2020 Wiley‐VCH GmbH
ISSN
1614-6832
eISSN
1614-6840
DOI
10.1002/aenm.202002128
Publisher site
See Article on Publisher Site

Abstract

Mg‐ion batteries (MIBs) possess promising advantages over monovalent Li‐ion battery technology. However, one of the myriad obstacles in realizing highly efficient MIBs is a limited selection of cathode materials that can enable reversible, stable Mg2+ intercalation at a high operating voltage. Here, a scalable method is showcased to synthesize a hydrated MgxV5O12 cathode, which shows a high capacity of ≈160 mAh g−1 with a high voltage of 2.1 V, a decent rate capability, and an outstanding cycling life (e.g., 81% capacity retention after 10 000 cycles). The combination of in situ and ex situ characterizations and first‐principles calculations provides evidence of reversible, facile topochemical Mg2+ intercalation into the expanded 2D channels of the hydrated MgxV5O12 cathode, which results from the synergistic effects of Mg2+ pillars and structural H2O. The findings underscore the advantage of the rich but controllable chemistry of vanadium oxide bronzes in achieving practical multivalent cation mobility.

Journal

Advanced Energy MaterialsWiley

Published: Dec 1, 2020

Keywords: ; ;

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