Influence of Side-Chain Chemistry on Structure and Ionic Conduction Characteristics of Polythiophene Derivatives: A Computational and Experimental Study

Dong, Ban Xuan; Nowak, Christian; Onorato, Jonathan W.; Strzalka, Joseph; Escobedo, Fernando A.; Luscombe, Christine K.; Nealey, Paul F.; Patel, Shrayesh N.

doi:10.1021/acs.chemmater.8b05257

Title: Influence of Side-Chain Chemistry on Structure and Ionic Conduction Characteristics of Polythiophene Derivatives: A Computational and Experimental Study

Journal Article · Fri Feb 15 00:00:00 EST 2019 · Chemistry of Materials

DOI:https://doi.org/10.1021/acs.chemmater.8b05257· OSTI ID:1498068

^[1]; Nowak, Christian ^[2]; Onorato, Jonathan W. ^[3]; Strzalka, Joseph ^[4];

^[2];

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Univ. of Chicago, Chicago, IL (United States)
Cornell Univ., Ithaca, NY (United States)
Univ. of Washington, Seattle, WA (United States)
Argonne National Lab. (ANL), Lemont, IL (United States)
Univ. of Chicago, Chicago, IL (United States); Argonne National Lab. (ANL), Lemont, IL (United States)

Although extensive efforts have been devoted to understanding electronic transport in conjugated polymers, little is known about their ionic conduction characteristics in relation to polymer chemistry, processing, and morphology. This work presents a combined computational and experimental study on morphology and ion transport in thin-film blends of polythiophene derivatives bearing oligoethylene glycol side-chains and lithium bis(trifluoromethanesulfonyl)imide (LiTFSI). Using molecular dynamics (MD) simulation, we show that in the amorphous phase, the polythiophene derivative P3MEET bearing oligoethylene glycol side-chains with oxygen directly attached to the thiophene rings possesses lower Li⁺ ionic conductivity compared to its analog P3MEEMT that has a methyl spacer between the oxygen and the thiophene rings. Structural characterization of P3MEET and P3MEEMT thin film upon blending with LiTFSI indicates that adding LiTFSI expands the side-chain domains of the polymer crystallites and reduces the total degree of crystallinity at the same time. Moreover, LiTFSI is found to infiltrate both the amorphous and crystalline regimes at low concentrations but preferably resides in the amorphous domain at high LiTFSI concentrations. Ionic transport measured by electrochemical impedance spectroscopy in both P3MEET- and P3MEEMT-LiTFSI thin films is found to occur predominately in the amorphous domain, and ionic conductivity in P3MEEMT-LiTFSI is always higher than in P3MEET-LiTFSI samples, consistent with predictions from MD simulations. As a result, our work provides a platform to predict and study the influence of polymer chemistry on the ionic conductivity of conjugated polymers.

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1498068

Journal Information:: Chemistry of Materials, Vol. 31, Issue 4; ISSN 0897-4756

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 62 works

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
36 MATERIALS SCIENCE
Conjugated polymer
LiTFSI
MD simulation
ionic conduction
mixed conduction
polar side-chains

Title: Influence of Side-Chain Chemistry on Structure and Ionic Conduction Characteristics of Polythiophene Derivatives: A Computational and Experimental Study

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