Journal article
High-Ionicity Electrolytes Based on Bulky Fluoroborate Anions for Stable Na-Metal Cycling
DT Duncan, B Roy, SL Piper, C Nguyen, P Howlett, M Forsyth, DR Macfarlane, J Sun, M Kar
Journal of Physical Chemistry C | AMER CHEMICAL SOC | Published : 2022
Abstract
Currently available electrolyte materials for sodium battery technology remain unoptimized, despite the success of their lithium counterparts. Herein, highly fluorinated borate ester anions are synthesized and characterized in terms of their physical and electrochemical properties as sodium salts in 1,2-dimethoxyethane (DME) solvent. Walden analysis and nuclear magnetic resonance pulsed field gradient diffusion measurements are utilized to probe the ionicity of the electrolytes, demonstrating that sodium 1,1,1,3,3,3-(tetrakis)hexafluoroisopropoxy borate (NaB(hfip)4·3DME) possesses notably high ionicity when compared to NaPF6and NaFSI at an equivalent Na+concentration. NaB(hfip)4/DME is explo..
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Grants
Awarded by Ministerio de Ciencia, Innovación y Universidades
Funding Acknowledgements
The authors acknowledge the Australian Research Council funded StorEnergy Industrial Transformation Training Centre (IC180100049) for financial support. The authors acknowledge the Basque Government and the Ministerio de Ciencia, Innovacion y Universidades of Spain, through the Elkartek program CICe2020 and PID2019-107468RB-C22 for the provided NFP material. The authors also thank Saliha Saher and Dr. Pavel Cherepanov for their assistance.