Unraveling Ion Transport in Trifluoromethanesulfonimide Pentablock Copolymer Membranes in Nonaqueous Electrolytes

Michelle L. Lehmann; Guang Yang; Jagjit Nanda; Tomonori Saito

doi:10.1021/acs.macromol.2c00513

Unraveling Ion Transport in Trifluoromethanesulfonimide Pentablock Copolymer Membranes in Nonaqueous Electrolytes

Michelle L. Lehmann, Guang Yang, Jagjit Nanda, Tomonori Saito

Research output: Contribution to journal › Article › peer-review

5 Scopus citations

Abstract

Cation exchange membranes provide a key function in various nonaqueous energy storage technologies. As such, understanding the role of a nonaqueous liquid electrolyte on ion transport through a membrane is imperative. This study unravels relationships between membrane ion transport and electrolyte salt concentration utilizing a trifluoromethanesulfonimide-based pentablock copolymer membrane with polar and nonpolar nonaqueous electrolyte solutions. The membrane plasticized with propylene carbonate (PC) exhibits a single-ion conductivity of 9.3 × 10^-6S/cm at 25 °C. Tailoring the nonaqueous electrolyte and electrolyte salt concentration enables the single-ion conducting membrane to maintain a high cation transport number, >0.75, and boost ion conductivity more than 10 times to 1.3 × 10^-4S/cm at 25 °C for the PC-based electrolyte solution. The findings provide critically important design parameters for energy storage systems utilizing nonaqueous electrolytes, such as Li- and Na-ion batteries and nonaqueous flow battery technologies.

Original language	English
Pages (from-to)	7740-7751
Number of pages	12
Journal	Macromolecules
Volume	55
Issue number	17
DOIs	https://doi.org/10.1021/acs.macromol.2c00513
State	Published - Sep 13 2022

Funding

This work was supported by Dr. Imre Gyuk, Office of Electricity, Department of Energy. M.L. also acknowledges support from the UTK Science Alliance GATE fellowship. We thank Drs. Justin Kennemur, Karen Winey, and Vera Bocharova for helpful discussions on F NMR and SAXS analysis as well as Sirui Ge for running solution SAXS measurements. SAXS measurements were enabled by the Major Research Instrumentation program of the National Science Foundation under Award DMR-1827474. We also thank Kraton Corporation for providing us with Nexar. 19

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title = "Unraveling Ion Transport in Trifluoromethanesulfonimide Pentablock Copolymer Membranes in Nonaqueous Electrolytes",

abstract = "Cation exchange membranes provide a key function in various nonaqueous energy storage technologies. As such, understanding the role of a nonaqueous liquid electrolyte on ion transport through a membrane is imperative. This study unravels relationships between membrane ion transport and electrolyte salt concentration utilizing a trifluoromethanesulfonimide-based pentablock copolymer membrane with polar and nonpolar nonaqueous electrolyte solutions. The membrane plasticized with propylene carbonate (PC) exhibits a single-ion conductivity of 9.3 × 10-6S/cm at 25 °C. Tailoring the nonaqueous electrolyte and electrolyte salt concentration enables the single-ion conducting membrane to maintain a high cation transport number, >0.75, and boost ion conductivity more than 10 times to 1.3 × 10-4S/cm at 25 °C for the PC-based electrolyte solution. The findings provide critically important design parameters for energy storage systems utilizing nonaqueous electrolytes, such as Li- and Na-ion batteries and nonaqueous flow battery technologies.",

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AU - Saito, Tomonori

PY - 2022/9/13

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AB - Cation exchange membranes provide a key function in various nonaqueous energy storage technologies. As such, understanding the role of a nonaqueous liquid electrolyte on ion transport through a membrane is imperative. This study unravels relationships between membrane ion transport and electrolyte salt concentration utilizing a trifluoromethanesulfonimide-based pentablock copolymer membrane with polar and nonpolar nonaqueous electrolyte solutions. The membrane plasticized with propylene carbonate (PC) exhibits a single-ion conductivity of 9.3 × 10-6S/cm at 25 °C. Tailoring the nonaqueous electrolyte and electrolyte salt concentration enables the single-ion conducting membrane to maintain a high cation transport number, >0.75, and boost ion conductivity more than 10 times to 1.3 × 10-4S/cm at 25 °C for the PC-based electrolyte solution. The findings provide critically important design parameters for energy storage systems utilizing nonaqueous electrolytes, such as Li- and Na-ion batteries and nonaqueous flow battery technologies.

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Unraveling Ion Transport in Trifluoromethanesulfonimide Pentablock Copolymer Membranes in Nonaqueous Electrolytes

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