A Fluorinated Alkoxyaluminate Electrolyte for Magnesium-Ion Batteries

Jake T. Herb; Carl A. Nist-Lund; Craig B. Arnold

doi:10.1021/acsenergylett.6b00356

A Fluorinated Alkoxyaluminate Electrolyte for Magnesium-Ion Batteries

Jake T. Herb, Carl A. Nist-Lund, Craig B. Arnold

Research output: Contribution to journal › Article › peer-review

114 Scopus citations

Abstract

The lack of electrolytes that simultaneously possess high Coulombic efficiency, conductivity, and voltage stability has hindered the deployment of rechargeable magnesium-ion batteries. With few exceptions, the tenacious oxide layer on magnesium metal has limited the scope of research to halide ion-based electrolytes, which help activate the electrode surface but also limit the working voltage window considerably. Herein, we demonstrate a new class of magnesium electrolytes based on fluoroalkoxyaluminate anions synthesized via a facile and scalable method and its incorporation in a full battery cell. Mixtures of magnesium and aluminum fluoroalkoxides in ethereal solvents result in solutions that can reversibly deposit magnesium metal with near unit efficiency in addition to achieving suitable oxidative stabilities (>3.5 V vs Mg/Mg²⁺ on glassy carbon and gold) and conductivities (>6 mS cm^-1).

Original language	English (US)
Pages (from-to)	1227-1232
Number of pages	6
Journal	ACS Energy Letters
Volume	1
Issue number	6
DOIs	https://doi.org/10.1021/acsenergylett.6b00356
State	Published - Dec 9 2016

All Science Journal Classification (ASJC) codes

Chemistry (miscellaneous)
Renewable Energy, Sustainability and the Environment
Fuel Technology
Energy Engineering and Power Technology
Materials Chemistry

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10.1021/acsenergylett.6b00356

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title = "A Fluorinated Alkoxyaluminate Electrolyte for Magnesium-Ion Batteries",

abstract = "The lack of electrolytes that simultaneously possess high Coulombic efficiency, conductivity, and voltage stability has hindered the deployment of rechargeable magnesium-ion batteries. With few exceptions, the tenacious oxide layer on magnesium metal has limited the scope of research to halide ion-based electrolytes, which help activate the electrode surface but also limit the working voltage window considerably. Herein, we demonstrate a new class of magnesium electrolytes based on fluoroalkoxyaluminate anions synthesized via a facile and scalable method and its incorporation in a full battery cell. Mixtures of magnesium and aluminum fluoroalkoxides in ethereal solvents result in solutions that can reversibly deposit magnesium metal with near unit efficiency in addition to achieving suitable oxidative stabilities (>3.5 V vs Mg/Mg2+ on glassy carbon and gold) and conductivities (>6 mS cm-1).",

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AB - The lack of electrolytes that simultaneously possess high Coulombic efficiency, conductivity, and voltage stability has hindered the deployment of rechargeable magnesium-ion batteries. With few exceptions, the tenacious oxide layer on magnesium metal has limited the scope of research to halide ion-based electrolytes, which help activate the electrode surface but also limit the working voltage window considerably. Herein, we demonstrate a new class of magnesium electrolytes based on fluoroalkoxyaluminate anions synthesized via a facile and scalable method and its incorporation in a full battery cell. Mixtures of magnesium and aluminum fluoroalkoxides in ethereal solvents result in solutions that can reversibly deposit magnesium metal with near unit efficiency in addition to achieving suitable oxidative stabilities (>3.5 V vs Mg/Mg2+ on glassy carbon and gold) and conductivities (>6 mS cm-1).

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A Fluorinated Alkoxyaluminate Electrolyte for Magnesium-Ion Batteries

Abstract

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