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A Stable, Non‐Corrosive Perfluorinated Pinacolatoborate Mg Electrolyte for Rechargeable Mg Batteries
Author(s) -
Luo Jian,
Bi Yujing,
Zhang Liping,
Zhang Xiaoyin,
Liu Tianbiao Leo
Publication year - 2019
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201902009
Subject(s) - electrolyte , overpotential , faraday efficiency , anode , electrochemistry , battery (electricity) , reagent , chemistry , chemical engineering , inorganic chemistry , energy storage , chloride , materials science , electrode , organic chemistry , power (physics) , physics , quantum mechanics , engineering
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 2 C 2 (CF 3 ) 4 ) 2 ] 2 (abbreviated as Mg‐FPB ), was synthesized by a convenient method from commercially available reagents and fully characterized. The Mg‐FPB 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 Mg‐FPB electrolyte was applied to assemble a high voltage, rechargeable Mg/MnO 2 battery with a discharge capacity of 150 mAh g −1 .