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Supported Ionic Liquid Gel Membrane Electrolytes for a Safe and Flexible Sodium Metal Battery

journal contribution
posted on 01.01.2019, 00:00 authored by T C Mendes, X Zhang, Y Wu, Patrick HowlettPatrick Howlett, Maria ForsythMaria Forsyth, D R MacFarlane
© 2019 American Chemical Society. Concerns about the sustainability of lithium supplies has stimulated interest in alternative energy storage chemistries including in sodium metal and sodium ion batteries. Gel ionic liquid electrolytes are investigated here as an important option for secondary sodium batteries due to their leakage-free and superior safety when compared to standard flammable electrolytes. Supported ionic liquid gel membranes (SILGMs) were prepared as both electrolyte and separator for a sodium metal battery using a carbon-coated sodium vanadium phosphate material (Na 3 V 2 (PO 4 ) 3 @C or NVP@C) as cathode. SILGM-based coin cells exhibit a specific capacity retention of 92% after 150 charge-discharge cycles with a Coulombic efficiency of 99.9%. We also demonstrate the operation of SILGMs in a laminated flexible sodium battery. The SILGM-based flexible battery exhibits a good flexibility and shows a remarkably stable operation even when opening the device or cutting into pieces. It is expected that SILGMs will become promising separator/electrolyte materials in practical application and thus will promote the development of nonflammable and flexible sodium batteries.

History

Journal

ACS Sustainable Chemistry and Engineering

Volume

7

Issue

4

Pagination

3722 - 3726

Publisher

ACS Publications

Location

Washington, D.C.

eISSN

2168-0485

Language

eng

Publication classification

C1 Refereed article in a scholarly journal