An investigation of the ionic conductivity and species crossover of lithiated Nafion 117 in nonaqueous electrolytes

Liang Su, Robert M. Darling, Kevin G. Gallagher, Wei Xie, Jacob L. Thelen, Andres F. Badel, John L. Barton, Kevin J. Cheng, Nitash P. Balsara, Jeffrey S. Moore, Fikile R. Brushett

Research output: Contribution to journalArticle

Abstract

Nonaqueous redox flow batteries are a fast-growing area of research and development motivated by the need to develop lowcost energy storage systems. The identification of a highly conductive, yet selective membrane, is of paramount importance to enabling such a technology. Herein, we report the swelling behavior, ionic conductivity, and species crossover of lithiated Nafion 117 membranes immersed in three nonaqueous electrolytes (PC, PC : EC, and DMSO). Our results show that solvent volume fraction within the membrane has the greatest effect on both conductivity and crossover. An approximate linear relationship between diffusive crossover of neutral redox species (ferrocene) and the ionic conductivity of membrane was observed. As a secondary effect, the charge on redox species modifies crossover rates in accordance with Donnan exclusion. The selectivity of membrane is derived mathematically and compared to experimental results reported here. The relatively low selectivity for lithiated Nafion 117 in nonaqueous conditions suggests that new membranes are required for competitive nonaqueous redox flow batteries to be realized. Potential design rules are suggested for the future membrane engineering work.

Original languageEnglish (US)
Pages (from-to)A5253-A5262
JournalJournal of the Electrochemical Society
Volume163
Issue number1
DOIs
StatePublished - 2016

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

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