Li<sup>+</sup> and Oxidant Addition To Control Ionic and Electronic Conduction in Ionic Liquid-Functionalized Conjugated Polymers
نویسندگان
چکیده
Conduction of ions and charge (electrons) often follow distinct materials design rules, presenting a significant challenge for the development homogeneous that are good at both. The fundamental interactions dictate ionic electronic conduction in mixed conductors still unclear. Here, we characterize class polymeric which liquid groups tethered to an electron-conducting conjugated polymer backbone. A model liquid, poly{3-[6′-(N-methylimidazolium)hexyl]thiophene}BF4– (P3HT-IM), is synthesized shown have long-range ordering. Chemical oxidation results room-temperature conductivity 10–2 S cm–1. also capable dissolving Li+ salt up concentration rsalt = 1 [moles salt]/[moles monomer]. displays monotonic increase with concentration, reaching maximum 10–5 cm–1 highest 1. Notably, this among first studies both liquid-functionalized upon addition oxidant salt. All-atom molecular dynamics (MD) simulations indicate imidazolium side chains promote formation percolated network solvation sites high concentrations, facilitates ion transport. Pulsed-field gradient nuclear magnetic resonance diffusivity measurements MD lithium transference number around 0.5, suggesting promotes transport way unique from many ion-conducting systems. These suggest diffuse, liquid-like backbone serves as effective approach facilitate simultaneous lithium-ion absence solvent.
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ژورنال
عنوان ژورنال: Chemistry of Materials
سال: 2021
ISSN: ['1520-5002', '0897-4756']
DOI: https://doi.org/10.1021/acs.chemmater.1c01811