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Reversible Dendrite-Free Potassium Plating and Stripping Electrochemistry for Potassium Secondary Batteries
journal contribution
posted on 2017-06-29, 00:00 authored by Neng Xiao, William D. McCulloch, Yiying WuRechargeable potassium metal batteries
have recently emerged as
alternative energy storage devices beyond lithium-ion batteries. However,
potassium metal anodes suffer from poor reversibility during plating
and stripping processes due to their high reactivity and unstable
solid electrolyte interphase (SEI). Herein, it is reported for the
first time that a potassium bis(fluoroslufonyl)imide (KFSI)-dimethoxyethane
(DME) electrolyte forms a uniform SEI on the surface of potassium
enabling reversible potassium plating/stripping electrochemistry with
high efficiency (∼99%) at ambient temperature. Furthermore,
the superconcentrated KFSI-DME electrolyte shows excellent electrochemical
stability up to 5 V (vs K/K+) which enables good compatibility
with high-voltage cathodes. Full cells with potassium Prussian blue
cathodes are demonstrated. Our work contributes toward the understanding
of potassium plating/stripping electrochemistry and paves the way
for the development of potassium metal battery technologies.
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alternative energy storage deviceselectrolyte interphasepotassium metal anodesambient temperatureelectrolyte formsFull cellsKFSI-DME electrolyteplatingpotassium metal battery technologiesBatteries Rechargeable potassium metal batteries5 Vlithium-ion batteriesReversible Dendrite-Free Potassium Platingpotassium Prussianuniform SEIStripping Electrochemistryelectrochemical stability
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