wang-mixedionicelectronic-2020.pdf (3.28 MB)
Download file

Mixed ionic-electronic conductors based on PEDOT:PolyDADMA and organic ionic plastic crystals

Download (3.28 MB)
journal contribution
posted on 01.09.2020, 00:00 authored by R D Olmo, N Casado, J L Olmedo-Martínez, Xiaoen WangXiaoen Wang, Maria ForsythMaria Forsyth
Mixed ionic-electronic conductors, such as poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate) (PEDOT:PSS) are postulated to be the next generation materials in energy storage and electronic devices. Although many studies have aimed to enhance the electronic conductivity and mechanical properties of these materials, there has been little focus on ionic conductivity. In this work, blends based on PEDOT stabilized by the polyelectrolyte poly(diallyldimethylammonium) (PolyDADMA X) are reported, where the X anion is either chloride (Cl), bis(fluorosulfonyl)imide (FSI), bis(trifluoromethylsulfonyl)imide (TFSI), triflate (CF3SO3) or tosylate (Tos). Electronic conductivity values of 0.6 S cm−1 were achieved in films of PEDOT:PolyDADMA FSI (without any post-treatment), with an ionic conductivity of 5 × 10−6 S cm−1 at 70 °C. Organic ionic plastic crystals (OIPCs) based on the cation N-ethyl-N-methylpyrrolidinium (C2mpyr+) with similar anions were added to synergistically enhance both electronic and ionic conductivities. PEDOT:PolyDADMA X / [C2mpyr][X] composites (80/20 wt%) resulted in higher ionic conductivity values (e.g., 2 × 10−5 S cm−1 at 70 °C for PEDOT:PolyDADMA FSI/[C2mpyr][FSI]) and improved electrochemical performance versus the neat PEDOT:PolyDADMA X with no OIPC. Herein, new materials are presented and discussed including new PEDOT:PolyDADMA and organic ionic plastic crystal blends highlighting their promising properties for energy storage applications.

History

Journal

Polymers

Volume

12

Issue

9

Article number

1981

Pagination

1 - 18

Publisher

MDPI

Location

Basel, Switzerland

ISSN

2073-4360

eISSN

2073-4360

Language

English

Publication classification

C1 Refereed article in a scholarly journal