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Magnesium borohydride/tetraglyme electrolyte for rechargeable magnesium batteries

FEILURE Tuerxun  NULI Yanna  SU Shuojian  YANG Jun  WANG JiuLin  
【摘要】:Different from Li batteries,Mg batteries suffer from the lack of suitable cathode materials and electrolyte systems.It is necessary to discover a right electrolyte with reversible Mg deposition and a wide electrochemical window for the development of magnesium batteries.Recently,Mohtadi et al.[1]confirmed reversible magnesium deposition/dissolution from a new class of electrolytes based on a relatively ionic and halide-free inorganic salt Mg(BH_4)_2 in both tetrahydrofuran(THF) and dimethoxyethane(DME) ether solvents.LiBH_4was employed as an additive to increase the electrochemical performance,and 94%coulombic efficiencies for Mg dissolution/dissolution were observed.Y.Y.Shao et al.[2]further developed Mg(BH_4)_2 based electrolyte with DGM(diglyme) as a solvent and LiBH_4 also an additive,in which the coulombic efficiency of close to 100%was achieved in the electrolyte with 0.1 mol/L Mg(BH_4)_2 and 1.5 mol/L LiBH_4 in DGM.Herein,quinquedentate ligand tetraglyme(TG) with higher safety was further developed as the solvent of Mg(BH_4)_2.More importantly,a high concentration electrolyte based on Mg(BH_4)_2 in TG with a higher anodic stability on non-inert metal electrode was pursued for practical application.As shown in Fig.la,the anodic stability of 0.5 mol/L heated Mg(BH_4)_2/LiBH_4/TG([LiBH_4]=1.5 mol/L) electrolyte on SS electrode maintains at approximately 2.4 V.Moreover,the electrolyte exhibits good compatibility with Mo_6S_8 cathode,as shown in Fig.1b.

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