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H2O‐Boosted MgProton Collaborated Energy Storage for Rechargeable Mg‐Metal Batteries

H2O‐Boosted MgProton Collaborated Energy Storage for Rechargeable Mg‐Metal Batteries Rechargeable magnesium batteries (RMBs) are a kind of energy storage system with high safety, low cost, and high volumetric energy density. In general perception, H2O will passivate the Mg‐metal anode. But herein, a coordination–hydrolysis strategy is developed, in which H2O can be used as an additive to produce dissociated H+. Moreover, MgH+ energy storage mechanism is discovered on CuSe cathode, which helps the specific capacity and energy density enhance to 480 mAh g−1 and 413 Wh kg−1, respectively. This coordination–hydrolysis strategy also promotes the conductivity and electron transfer ability of electrolyte. Consequently, the specific capacity can remain 247 mAh g−1 even at 2 A g−1. MgH+ energy storage route gets rid of massive cathode material, and protons have the smallest size and lightest weight, whose theoretical energy density can reach 4230 Wh kg−1. The results elucidated here provide a new route for energy‐dense RMBs. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Advanced Energy Materials Wiley

H2O‐Boosted MgProton Collaborated Energy Storage for Rechargeable Mg‐Metal Batteries

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Publisher
Wiley
Copyright
© 2022 Wiley‐VCH GmbH
ISSN
1614-6832
eISSN
1614-6840
DOI
10.1002/aenm.202201718
Publisher site
See Article on Publisher Site

Abstract

Rechargeable magnesium batteries (RMBs) are a kind of energy storage system with high safety, low cost, and high volumetric energy density. In general perception, H2O will passivate the Mg‐metal anode. But herein, a coordination–hydrolysis strategy is developed, in which H2O can be used as an additive to produce dissociated H+. Moreover, MgH+ energy storage mechanism is discovered on CuSe cathode, which helps the specific capacity and energy density enhance to 480 mAh g−1 and 413 Wh kg−1, respectively. This coordination–hydrolysis strategy also promotes the conductivity and electron transfer ability of electrolyte. Consequently, the specific capacity can remain 247 mAh g−1 even at 2 A g−1. MgH+ energy storage route gets rid of massive cathode material, and protons have the smallest size and lightest weight, whose theoretical energy density can reach 4230 Wh kg−1. The results elucidated here provide a new route for energy‐dense RMBs.

Journal

Advanced Energy MaterialsWiley

Published: Sep 1, 2022

Keywords: high rate capability; Mg H + energy storage route; rechargeable Mg‐metal batteries; water‐boosted electrolyte

References