File(s) under permanent embargo

High coulombic efficiency Na-O2 batteries enabled by a bilayer ionogel/ionic liquid

journal contribution
posted on 25.10.2019, 00:00 authored by The An Ha, A Fdz De Anastro, N Ortiz-Vitoriano, Jian Fang, D R MacFarlane, Maria ForsythMaria Forsyth, D Mecerreyes, Patrick HowlettPatrick Howlett, Cristina Pozo-GonzaloCristina Pozo-Gonzalo
© 2019 American Chemical Society. Sodium-oxygen (Na-O2) cells are a promising high energy density storage technology with a theoretical specific energy of 1605 Wh kg-1. However, this technology faces certain challenges in order to achieve both a high practical energy density as well as long-term cycling capability. In this Letter, a superior Coulombic cyclic efficiency, close to 100%, has been demonstrated by the use of a bilayer electrolyte composed of an ionogel and an ionic liquid electrolyte, reported herein for the first time. The presence of the ionogel plays a major role in the prevention of side reactions originating at the anode, providing a promising route to extend cell cycling, whereas the ionic liquid is essential to support high reaction rates at the cathode.

History

Journal

Journal of physical chemistry letters

Volume

10

Pagination

7050 - 7055

Publisher

ACS Publications

Location

Washington, D.C.

eISSN

1948-7185

Language

eng

Publication classification

C1 Refereed article in a scholarly journal