Interconnected ionic domains enhance conductivity in microphase separated block copolymer electrolytes

Arges, Christopher G.; Kambe, Yu; Dolejsi, Moshe; Wu, Guang-Peng; Segal-Pertz, Tamar; Ren, Jiaxing; Cao, Chi; Craig, Gordon S.  W.; Nealey, Paul F.

doi:10.1039/c6ta10838e

Interconnected ionic domains enhance conductivity in microphase separated block copolymer electrolytes

Journal Article · Sat Dec 31 23:00:00 EST 2016 · Journal of Materials Chemistry. A

DOI:https://doi.org/10.1039/c6ta10838e· OSTI ID:1376724

; ; ; ; ; Ren, Jiaxing; Cao, Chi; ;

Block copolymer electrolytes (BCEs) represent an attractive choice as solid-state ionic conductors for electrochemical technologies used in energy storage and conversion, water treatment, sensors, and data storage and processing. Unlocking the maximum ionic conductivity of BCEs requires an intimate understanding as to how the microphase separated structure influences transport properties. However, elucidating such knowledge remains elusive due to the challenging task of precisely engineering BCEs with a defined structure in bulk materials. In this work, we examined BCEs in a thin film format because it was amenable to attaining BCEs with a desired nanostructure. Specifically, we systematically investigated anion-conducting BCEs with different degrees of connectivity of the ionic domains. For the first time, we demonstrate that increasing terminal defects in the ionic domain from 1 terminal defect per mu m(2) to 20 terminal defects per mu m(2) ( a relatively small amount of defects) decreased ionic conductivity by 67% compared to the maximum value attained. Conversely, maximizing ionic domain connectivity increased the ionic conductivity by two-fold over a non-ordered BCE film. These experiments highlight that microphase separation alone was insufficient for ameliorating ionic conductivity in BCEs. Rather, microphase separation coupled with complete ionic domain connectivity realized BCEs with significantly enhanced ionic conductivity.

Research Organization:: Argonne National Laboratory (ANL)

Sponsoring Organization:: USDOE Office of Science - Office of Basic Energy Sciences - Materials Sciences and Engineering Division

DOE Contract Number:: AC02-06CH11357

OSTI ID:: 1376724

Journal Information:: Journal of Materials Chemistry. A, Journal Name: Journal of Materials Chemistry. A Journal Issue: 11 Vol. 5; ISSN 2050-7488

Publisher:: Royal Society of Chemistry

Country of Publication:: United States

Language:: English

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