In:
ECS Meeting Abstracts, The Electrochemical Society, Vol. MA2019-02, No. 6 ( 2019-09-01), p. 498-498
Kurzfassung:
Conventional electrolytes made by mixing simple Mg 2+ salts and aprotic solvents, analogous to those in Li-ion batteries, are incompatible with Mg anodes because Mg metal readily reacts with such electrolytes, producing a passivation layer which blocks Mg 2+ cation transport. Here, we report that, through tuning a conventional electrolyte—Mg(TFSI) 2 (TFSI - is N(SO 2 CF 3 ) 2 - ) with an Mg(BH 4 ) 2 additive—highly reversible Mg plating/stripping with high coulombic efficiency close to 100% is achievable, by decoupling the interaction between Mg 2+ and TFSI - and enhanced reductive stability of free TFSI - . A critical adsorption step between the Mg 0 atoms and active Mg cation clusters involving BH 4 - anions is demonstrated on evolving electrified interface based upon analysis of distribution of relaxation times (DRT) from operando electrochemical impedance spectroscopy (EIS), operando electrochemical X-ray absorption spectroscopy (XAS), nuclear magnetic resonance (NMR), and density functional theory (DFT) calculations. This study suggests a new approach for developing advanced electrolytes and provides an in-operando analysis kit of probing electrified interfaces with adsorption of active Mg cation clusters for rechargeable Mg batteries.
Materialart:
Online-Ressource
ISSN:
2151-2043
DOI:
10.1149/MA2019-02/6/498
Sprache:
Unbekannt
Verlag:
The Electrochemical Society
Publikationsdatum:
2019
ZDB Id:
2438749-6
Permalink