Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 41, Pages 37595-37601Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b11215
Keywords
Mg batteries; charge storage; capacitive processes; interfacial reactions; mixture electrolyte
Funding
- ENERGIX Programme of the Research Council of Norway [255108]
- Uninett Sigma2 AS in Norway [NN9264K]
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The development of Mg batteries based on the interfacial charge storage mechanism, where the capacity originates from capacitive processes and the solvent-related interfacial reactions, could efficiently circumvent the challenge of intercalation-based Mg batteries with sluggish kinetics. In this work, the proposed Mg organohaloaluminate mixture electrolyte is reported to improve the charge storage performance of the graphene-supported cathodes, resulting in both high cycling stability (91% capacity retention after 2000 cycles) and high rate capability (51% capacity retention when the current density increases by 100 times). The experimental and computational studies have revealed that the exceptional cell performance originates from the optimized electrode/electrolyte interface, where the highly reversible interfacial reactions occur with the 1,2-dimethoxyethane additive in the typical all-phenyl complex electrolyte. The fast charge-transfer kinetics along the surface of highly porous and conductive graphene-supported electrodes have also been observed.
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