skip to main content
DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Selective Charging Behavior in an Ionic Mixture Electrolyte-Supercapacitor System for Higher Energy and Power

Abstract

Ion–ion interactions in supercapacitor (SC) electrolytes are considered to have significant influence over the charging process and therefore the overall performance of the SC system. Current strategies used to weaken ionic interactions can enhance the power of SCs, but consequently, the energy density will decrease due to the increased distance between adjacent electrolyte ions at the electrode surface. Herein, we report on the simultaneous enhancement of the power and energy densities of a SC using an ionic mixture electrolyte with different types of ionic interactions. Two types of cations with stronger ionic interactions can be packed in a denser arrangement in mesopores to increase the capacitance, whereas only cations with weaker ionic interactions are allowed to enter micropores without sacrificing the power density. This unique selective charging behavior in different confined porous structure was investigated by solid-state nuclear magnetic resonance experiments and further confirmed theoretically by both density functional theory and molecular dynamics simulations. Furthermore, our results offer a distinct insight into pairing ionic mixture electrolytes with materials with confined porous characteristics and further propose that it is possible to control the charging process resulting in comprehensive enhancements in SC performance.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3];  [4];  [4];  [5]; ORCiD logo [5];  [2];  [6];  [2]; ORCiD logo [5]; ORCiD logo [5]; ORCiD logo [4]; ORCiD logo [2]
  1. Norwegian Univ. of Science and Technology, Trondheim (Norway); Drexel Univ., Philadelphia, PA (United States)
  2. Norwegian Univ. of Science and Technology, Trondheim (Norway)
  3. SINTEF Materials and Chemistry, Oslo (Norway)
  4. Drexel Univ., Philadelphia, PA (United States)
  5. Univ. of California, Riverside, CA (United States)
  6. SINTEF Materials and Chemistry, Trondheim (Norway)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center; Energy Frontier Research Centers (EFRC) (United States). Fluid Interface Reactions, Structures and Transport Center (FIRST); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1489029
Alternate Identifier(s):
OSTI ID: 1470145; OSTI ID: 1494890
Grant/Contract Number:  
ERKCC61; AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Journal of the American Chemical Society
Additional Journal Information:
Journal Volume: 139; Journal Issue: 51; Journal ID: ISSN 0002-7863
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; catalysis (heterogeneous), solar (fuels), energy storage (including batteries and capacitors), hydrogen and fuel cells, electrodes - solar, mechanical behavior, charge transport, materials and chemistry by design, synthesis (novel materials)

Citation Formats

Wang, Xuehang, Mehandzhiyski, Aleksandar Yordanov, Arstad, Bjørnar, Van Aken, Katherine L., Mathis, Tyler S., Gallegos, Alejandro, Tian, Ziqi, Ren, Dingding, Sheridan, Edel, Grimes, Brian Arthur, Jiang, De-en, Wu, Jianzhong, Gogotsi, Yury, and Chen, De. Selective Charging Behavior in an Ionic Mixture Electrolyte-Supercapacitor System for Higher Energy and Power. United States: N. p., 2017. Web. doi:10.1021/jacs.7b10693.
Wang, Xuehang, Mehandzhiyski, Aleksandar Yordanov, Arstad, Bjørnar, Van Aken, Katherine L., Mathis, Tyler S., Gallegos, Alejandro, Tian, Ziqi, Ren, Dingding, Sheridan, Edel, Grimes, Brian Arthur, Jiang, De-en, Wu, Jianzhong, Gogotsi, Yury, & Chen, De. Selective Charging Behavior in an Ionic Mixture Electrolyte-Supercapacitor System for Higher Energy and Power. United States. doi:10.1021/jacs.7b10693.
Wang, Xuehang, Mehandzhiyski, Aleksandar Yordanov, Arstad, Bjørnar, Van Aken, Katherine L., Mathis, Tyler S., Gallegos, Alejandro, Tian, Ziqi, Ren, Dingding, Sheridan, Edel, Grimes, Brian Arthur, Jiang, De-en, Wu, Jianzhong, Gogotsi, Yury, and Chen, De. Wed . "Selective Charging Behavior in an Ionic Mixture Electrolyte-Supercapacitor System for Higher Energy and Power". United States. doi:10.1021/jacs.7b10693. https://www.osti.gov/servlets/purl/1489029.
@article{osti_1489029,
title = {Selective Charging Behavior in an Ionic Mixture Electrolyte-Supercapacitor System for Higher Energy and Power},
author = {Wang, Xuehang and Mehandzhiyski, Aleksandar Yordanov and Arstad, Bjørnar and Van Aken, Katherine L. and Mathis, Tyler S. and Gallegos, Alejandro and Tian, Ziqi and Ren, Dingding and Sheridan, Edel and Grimes, Brian Arthur and Jiang, De-en and Wu, Jianzhong and Gogotsi, Yury and Chen, De},
abstractNote = {Ion–ion interactions in supercapacitor (SC) electrolytes are considered to have significant influence over the charging process and therefore the overall performance of the SC system. Current strategies used to weaken ionic interactions can enhance the power of SCs, but consequently, the energy density will decrease due to the increased distance between adjacent electrolyte ions at the electrode surface. Herein, we report on the simultaneous enhancement of the power and energy densities of a SC using an ionic mixture electrolyte with different types of ionic interactions. Two types of cations with stronger ionic interactions can be packed in a denser arrangement in mesopores to increase the capacitance, whereas only cations with weaker ionic interactions are allowed to enter micropores without sacrificing the power density. This unique selective charging behavior in different confined porous structure was investigated by solid-state nuclear magnetic resonance experiments and further confirmed theoretically by both density functional theory and molecular dynamics simulations. Furthermore, our results offer a distinct insight into pairing ionic mixture electrolytes with materials with confined porous characteristics and further propose that it is possible to control the charging process resulting in comprehensive enhancements in SC performance.},
doi = {10.1021/jacs.7b10693},
journal = {Journal of the American Chemical Society},
number = 51,
volume = 139,
place = {United States},
year = {2017},
month = {11}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Citation Metrics:
Cited by: 35 works
Citation information provided by
Web of Science

Figures / Tables:

Figure 1 Figure 1: (a,b) GCD at 1 A/g and CV curves at 10 mV/s of the mesopore-rich carbon Meso-2.0 nm. (c) Relation between normalized capacitance and TMABF4 concentration with three mesopore-rich carbon materials. (d) Schematic representation of a room-temperature ionic mixture in a charged slit pore: TMA+ and BF4 ions aremore » represented by charged hard spheres and EMIM+ by a charged sphere ‘EMIM(+)’ in connection with a neutral sphere ‘EMIM(n)’ that accounts for the uncharged ethyl group, the size of the spheres is determined by the molecular volume. (e) Distribution of cations and anions inside a slit pore (pore size = 1.875 nm) with negatively charged walls (ψ-PZC= −1.5 V) for the case of 22.2 wt % TMABF4 in EMIMBF4. (f) Schematic of the ionic interaction induced selective charging behavior of ionic mixture electrolyte. Black arrows (↔) represent ionic interactions: I. TMA+−BF4 interaction; II, EMIM+−BF4 interaction; III, steric effect near high confinement pore; IV, EMIM+−EMIM+ interaction; V, TMA+−EMIM+ interaction; red arrows (→) represent ion diffusion.« less

Save / Share:

Works referencing / citing this record:

Ionic liquid electrolytes in electric double layer capacitors
journal, July 2019


Ionic liquid electrolytes in electric double layer capacitors
journal, July 2019


    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.