- Main
Reversible Electrochemical Interface of Mg Metal and Conventional Electrolyte Enabled by Intermediate Adsorption
- Author(s): Wang, H;
- Feng, X;
- Chen, Y;
- Liu, YS;
- Han, KS;
- Zhou, M;
- Engelhard, MH;
- Murugesan, V;
- Assary, RS;
- Liu, TL;
- Henderson, W;
- Nie, Z;
- Gu, M;
- Xiao, J;
- Wang, C;
- Persson, K;
- Mei, D;
- Zhang, JG;
- Mueller, KT;
- Guo, J;
- Zavadil, K;
- Shao, Y;
- Liu, J
- et al.
Published Web Location
https://doi.org/10.1021/acsenergylett.9b02211Abstract
Conventional electrolytes made by mixing simple Mg2+ 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 that blocks Mg2+ transport. Here, we report that, through tuning a conventional electrolyte - Mg(TFSI)2 (TFSI- is N(SO2CF3)2-) - with an Mg(BH4)2 cosalt, highly reversible Mg plating/stripping with a high Coulombic efficiency is achieved by neutralizing the first solvation shell of Mg cationic clusters between Mg2+ and TFSI- and enhanced reductive stability of free TFSI-. A critical adsorption step between Mg0 atoms and active Mg cation clusters involving BH4- anions is identified to be the key enabler for reversible Mg plating/stripping through analysis of the 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.
Main Content
Enter the password to open this PDF file:
-
-
-
-
-
-
-
-
-
-
-
-
-
-