(Invited) Designer Ionic Liquids for Improved Magnesium Anode Behavior
Abstract
Our group has been involved in studies of the complexation and speciation of Mg2+ in ionic liquids as a means to understand the influence of coordination environment on Mg anode electrochemical behavior.1 In this presentation we will focus on the complexation of Mg2+ by bis(trifluoromethylsulfonyl)imide ionic anion (TFSI-), borohydride anion, glyme-based (i.e. PEGylated) solvents and chelating ionic liquids bearing polyethylene glycol-like chelating groups, and on the influence of such complexation on the reversibility of Mg electrodeposition/dissolution.1,2 Complexation is predominantly studied by Raman spectroscopy, which allows facile differentiation of complexed and free species. We show that the lessons learned from such studies of Mg2+ complexation allow the design of new chelating ionic liquids that show markedly improved Mg2+/Mg0 electrochemical behavior compared to the parent TFSI-based ionic liquids. Specifically, we describe reasonable coulombic efficiency (ca. 90%) and current densities (>1 mA/cm2) that are achievable through judicious choice of the complexation environment and other chemical features of the electrolyte system.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Sep 01, 2016
- Source ID
- 10.1149/ma2016-02/47/3460
Entities
People
- Ashok Kumar
- Daniel A. Buttry
- Tylan S Watkins