A new class of non-corrosive, highly efficient electrolytes for rechargeable magnesium batteries

Abstract

Easily synthesized fluorinated magnesium alkoxyborates with non-corrosive and chemically stable features show high electrochemical performance as magnesium ion conducting salts.

Halogenid‐basierte Materialien und Chemie für wiederaufladbare Batterien

“…Kürzlich wurden auch chlorfreie und nichtkorrosive Elektrolyte auf Basis von Mg‐basierten Salzen wie Mg(BH 4 ) 2 , Mg(CB 11 H 12 ) 2 (MMC), Mg[Al(hfip) 4 ] 2 und Borat‐basierten Mg‐Salzen für RMBs entwickelt . Inspiriert vom Lithium‐Elektrolyten von LiAl(hfip) 4 mit hoher Leitfähigkeit und elektrochemischer Stabilität, entwickelten Herb et al.…”

Magnesium-sulfur battery: its beginning and recent progress

“…[81] This class of compounds has the formula of Mg[Z(OR F ) 4 ] 2 , Z = Al, B; R F = fluorinated alkyl group. In general, one can expect that weaker cationanion interactions result in higher ionic conductivities.…”

“…[81] The sulfur cathode S/CMK-3 was prepared as previously described. [32] The Mg-S cells were tested with the solution of Mg[B(hfip) 4 ] 2 in glymes.…”

A Stable, Non-corrosive Perfluorinated Pinacolatoborate Mg Electrolyte for Rechargeable Mg Batteries

“…[2a] As Mg 2+ electrolytes play ap ivotal role in rechargeable Mg batteries,intensive efforts have been made in developing high-performance Mg 2+ electrolytes in the past decade. [7] However,M g(CB 11 H 12 ) 2 is expensive and not suitable for broad Mg battery applications because the synthesis of carborane anion (CB 11 H 12 À )-containing precursors is not trivial and they are very expensive with very limited commercial availability.M g[B(HFIP) 4 ] 2 lacks chemical stability under ambient conditions as it undergoes chemical decomposition in the presence of moisture, [7a] which is believed to be the same for Mg[Al(HFIP) 4 ] 2 .T herefore,t he development of chloride-free Mg electrolytes from inexpensive commercially available chemicals is required to simultaneously deliver excellent electrochemical performance and chemical stability.H erein, we report ah ighly electrochemically active,a nodically stable,a nd non-corrosive magnesium fluorinated pinacolatoborate,M g[B(O 2 C 2 (CF 3 ) 4 ) 2 ] 2 (abbreviated as Mg-FPB,F igure 1), which has strongly coordinating perfluorinated pinacolato bidentate ligands to stabilize the boron center. [7] However,M g(CB 11 H 12 ) 2 is expensive and not suitable for broad Mg battery applications because the synthesis of carborane anion (CB 11 H 12 À )-containing precursors is not trivial and they are very expensive with very limited commercial availability.M g[B(HFIP) 4 ] 2 lacks chemical stability under ambient conditions as it undergoes chemical decomposition in the presence of moisture, [7a] which is believed to be the same for Mg[Al(HFIP) 4 ] 2 .T herefore,t he development of chloride-free Mg electrolytes from inexpensive commercially available chemicals is required to simultaneously deliver excellent electrochemical performance and chemical stability.H erein, we report ah ighly electrochemically active,a nodically stable,a nd non-corrosive magnesium fluorinated pinacolatoborate,M g[B(O 2 C 2 (CF 3 ) 4 ) 2 ] 2 (abbreviated as Mg-FPB,F igure 1), which has strongly coordinating perfluorinated pinacolato bidentate ligands to stabilize the boron center.…”

“…Mg and astripping potential at Angewandte Chemie Zuschriften À0.111 V, giving overpotential of 197 mV,w hich is comparable with Mg/MgCl 2 /AlCl 3 (MMAC) electrolytes, [3f] but lower than reported chloride-free Mg electrolytes. Furthermore,t he Mg-FPB electrolyte exhibited an outstanding anodic stability at more than 4.0 Vv s. Mg, which is comparable with reported chloride-free Mg electrolytes, [4][5][6][7] but significantly improved over other reported Mg electrolytes. Furthermore,t he Mg-FPB electrolyte exhibited an outstanding anodic stability at more than 4.0 Vv s. Mg, which is comparable with reported chloride-free Mg electrolytes, [4][5][6][7] but significantly improved over other reported Mg electrolytes.…”