In:
Angewandte Chemie, Wiley, Vol. 135, No. 14 ( 2023-03-27)
Abstract:
Magnesium (Mg) metal secondary batteries have attracted much attention for their high safety and high energy density characteristics. However, the significant issues of the cathode/electrolyte interphase (CEI) in Mg batteries are still being ignored. In this work, a significant CEI layer on the typical Mo 6 S 8 cathode surface has been unprecedentedly constructed through the oxidation of the chloride‐free magnesium tetrakis(hexafluoroisopropyloxy)borate (Mg[B(hfip) 4 ] 2 ) salt under a proper charge cut‐off voltage condition. The CEI has been identified to contain B x O y effective species originating from the oxidation of [B(hfip) 4 ] − anion. It is confirmed that the B x O y species is beneficial to the desolvation of solvated Mg 2+ , speeding up the interfacial Mg 2+ transfer kinetics, thereby improving the Mg 2+ ‐storage capability of Mo 6 S 8 host. The firstly reported CEI in Mg batteries will give deeper insights into the interface issues in multivalent electrochemical systems.
Type of Medium:
Online Resource
ISSN:
0044-8249
,
1521-3757
DOI:
10.1002/ange.v135.14
DOI:
10.1002/ange.202217709
Language:
English
Publisher:
Wiley
Publication Date:
2023
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