Influence of humidity on performance and microscopic dynamics of an ionic liquid in supercapacitor

Osti, Naresh C.; Dyatkin, Boris; Thompson, Matthew W.; Tiet, Felix; Zhang, Pengfei; Dai, Sheng; Tyagi, Madhusudan; Cummings, Peter; Gogotsi, Yury G.; Wesolowski, David J.; Mamontov, Eugene

doi:10.1103/physrevmaterials.1.035402

Influence of humidity on performance and microscopic dynamics of an ionic liquid in supercapacitor

Journal Article · Fri Aug 11 00:00:00 EDT 2017 · Physical Review Materials

DOI:https://doi.org/10.1103/physrevmaterials.1.035402· OSTI ID:1797697

^[1]; Dyatkin, Boris ^[2]; Thompson, Matthew W. ^[3]; Tiet, Felix ^[3]; Zhang, Pengfei ^[1]; Dai, Sheng ^[1]; Tyagi, Madhusudan ^[4]; Cummings, Peter ^[3]; Gogotsi, Yury G. ^[2]; ^[1]; ^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Drexel Univ., Philadelphia, PA (United States)
Vanderbilt Univ., Nashville, TN (United States)
National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States). Center for Neutron Research; Univ. of Maryland, College Park, MD (United States)

We investigated the influence of water molecules on the diffusion, dynamics, and electrosorption of a room temperature ionic liquid (RTIL), [BMIm⁺][Tf₂N^-], confined in carbide-derived carbon with a bimodal nanoporosity. Water molecules in pores improved the charge storage densities and rate handling abilities of these materials in supercapacitor electrode configurations. We measured the water-dependent microscopic dynamics of the RTIL cations using quasi-elastic neutron scatting (QENS). The ionic liquid demonstrated greater mobility with increasing water uptake, facilitated by the nanoporous carbon environment, up to a well-defined saturation point. We concluded that water molecules displaced RTIL ions attached to the pore surfaces and improved the diffusivity of the displaced cations. This effect consequently increased capacitance and rate handling of the electrolyte in water-containing pores. Our findings suggest the possible effect of immiscible co-solvents on energy and power densities of energy storage devices, as well as the operating viability of non-aqueous supercapacitor electrolytes in humid environments.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1797697

Alternate ID(s):: OSTI ID: 1375266
OSTI ID: 1389034

Journal Information:: Physical Review Materials, Journal Name: Physical Review Materials Journal Issue: 3 Vol. 1; ISSN 2475-9953

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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