The stable cycling of Mg-metal anodes is limited by several problems, including sluggish electrochemical kinetics and passivation at the Mg surface. In this study, we present a high-entropy electrolyte composed of lithium triflate (LiOTf) and trimethyl phosphate (TMP) co-added to magnesium bis(trifluoromethane sulfonyl)imide (Mg(TFSI) /1,2-dimethoxyethane (DME) to significantly improve the electrochemical performance of Mg-metal anodes. The as-formed high-entropy Mg -2DME-OTf -Li -DME-TMP solvation structure effectively reduced the Mg -DME interaction in comparison with that observed in traditional Mg(TFSI) /DME electrolytes, thereby preventing the formation of insulating components on the Mg-metal anode and promoting its electrochemical kinetics and cycling stability. Comprehensive characterization revealed that the high-entropy solvation structure brought OTf and TMP to the surface of the Mg-metal anode and promoted the formation of a Mg (PO ) -rich interfacial layer, which is beneficial for enhancing Mg conductivity. Consequently, the Mg-metal anode achieved excellent reversibility with a high Coulombic efficiency of 98 % and low voltage hysteresis. This study provides new insights into the design of electrolytes for Mg-metal batteries.

Download full-text PDF

Source
http://dx.doi.org/10.1002/anie.202304411DOI Listing

Publication Analysis

Top Keywords

mg-metal anode
12
high-entropy electrolyte
8
mg-metal anodes
8
electrochemical kinetics
8
solvation structure
8
mg-metal
6
high-entropy
4
electrolyte enables
4
enables high
4
high reversibility
4

Similar Publications

Want AI Summaries of new PubMed Abstracts delivered to your In-box?

Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!