A Stable, Non‐Corrosive Perfluorinated Pinacolatoborate Mg Electrolyte for Rechargeable Mg Batteries

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  • Jian Luo
    Chemistry and Biochemistry Utah State University 0300 Old Main Hill Logan UT USA
  • Yujing Bi
    Chemistry and Biochemistry Utah State University 0300 Old Main Hill Logan UT USA
  • Liping Zhang
    Chemistry and Biochemistry Utah State University 0300 Old Main Hill Logan UT USA
  • Xiaoyin Zhang
    Chemistry and Biochemistry Utah State University 0300 Old Main Hill Logan UT USA
  • Tianbiao Leo Liu
    Chemistry and Biochemistry Utah State University 0300 Old Main Hill Logan UT USA

Description

<jats:title>Abstract</jats:title><jats:p>Mg batteries are a promising energy storage system because of the physicochemical merits of Mg as an anode material. However, the lack of electrochemically and chemically stable Mg electrolytes impedes the development of Mg batteries. In this study, a newly designed chloride‐free Mg perfluorinated pinacolatoborate, Mg[B(O<jats:sub>2</jats:sub>C<jats:sub>2</jats:sub>(CF<jats:sub>3</jats:sub>)<jats:sub>4</jats:sub>)<jats:sub>2</jats:sub>]<jats:sub>2</jats:sub> (abbreviated as <jats:bold>Mg‐FPB</jats:bold>), was synthesized by a convenient method from commercially available reagents and fully characterized. The <jats:bold>Mg‐FPB</jats:bold> electrolyte delivered outstanding electrochemical performance, specifically, 95 % Coulombic efficiency and 197 mV overpotential, enabling reversible Mg deposition, and an anodic stability of up to 4.0 V vs. Mg. The <jats:bold>Mg‐FPB</jats:bold> electrolyte was applied to assemble a high voltage, rechargeable Mg/MnO<jats:sub>2</jats:sub> battery with a discharge capacity of 150 mAh g<jats:sup>−1</jats:sup>.</jats:p>

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