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Fundamental Limitations of Ionic Conductivity in Polymerized Ionic Liquids

Journal Article · · Macromolecules
 [1];  [2];  [3];  [4];  [5];  [3];  [6]
  1. Univ. of Tennessee, Knoxville, TN (United States)
  2. Technische Universität Dortmund (Germany)
  3. City Univ. (CUNY), NY (United States)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); University of Silesia, SMCEBI, Chorzow (Poland)
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  6. Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
In this paper, we present detailed studies of ionic conductivity in several polymerized ionic liquids (PolyILs) with different size of mobile ions. Presented analysis revealed that charge diffusion in PolyILs is about 10 times slower than ion diffusion, suggesting strong ion–ion correlations that reduce ionic conductivity. The activation energy for the ion diffusion shows a nonmonotonous dependence on the mobile ion size, indicating a competition between Coulombic and elastic forces controlling ion transport in PolyILs. The former dominates mobility of small ions (e.g., Li), while the latter controls mobility of large ions (e.g., TFSI). We propose a simple qualitative model describing the activation energy for the ion diffusion. In conclusion, it suggests that an increase in dielectric constant of PolyILs should lead to a significant enhancement of conductivity of small ions (e.g., Li and Na).
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1490598
Journal Information:
Macromolecules, Journal Name: Macromolecules Journal Issue: 21 Vol. 51; ISSN 0024-9297
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (8)

Charging toward improved lithium-ion polymer electrolytes: exploiting synergistic experimental and computational approaches to facilitate materials design journal January 2019
Ion transport in polymeric ionic liquids: recent developments and open questions journal January 2019
Structural correlations tailor conductive properties in polymerized ionic liquids journal January 2019
Decoupling segmental relaxation and ionic conductivity for lithium-ion polymer electrolytes journal January 2019
Deeply supercooled aqueous LiCl solution studied by frequency-resolved shear rheology journal June 2019
Structure and dynamics of short-chain polymerized ionic liquids journal July 2019
Ion conduction and relaxation mechanism in ionogels embedded with imidazolium based ionic liquids journal October 2019
Decoupling segmental relaxation and ionic conductivity for lithium-ion polymer electrolytes text January 2019

Figures / Tables (11)


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