Journal
ACS MACRO LETTERS
Volume 2, Issue 11, Pages 990-995Publisher
AMER CHEMICAL SOC
DOI: 10.1021/mz400468m
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Funding
- Global Frontier R&D Program on Center for Multiscale Energy System
- National Research Foundation under the Ministry of Science, ICT Future, Korea [2012-054173]
- Ministry of Education, Science and Technology through the National Research Foundation of Korea [R31-10059]
- [2012-0005267]
- National Research Foundation of Korea [2013-PAL, 2011-0031570, 2011-0015343] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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We have investigated a new means to control the morphology and conductivity of block copolymer electrolytes by the inclusion of ionic units at the chain ends. A set of poly(styrene-b-ethylene oxide) (PS-b-PEO) block copolymers having dissimilar PEO end groups (-OH, -SO3H, and -SO3Li) exhibited various self-assembled morphologies including disordered, lamellar, and hexagonal cylindrical phases. Strikingly, the addition of Li salts to PS-b-PEO with sulfonate terminal groups afforded enriched nanostructures with significant differences in their conductivities depending on the salt concentration. In particular, a gyroid morphology with a 2-fold-enhanced normalized ionic conductivity was found for the sulfonate-terminated PS-b-PEO when compared to disordered PS-b-PEO-OH. This is closely related to the structural advantages of gyroid having cocontinuous ionic channels, which enable efficient transport of Li+ ions via less tortuous ion conduction pathways. This work presents fascinating experimental insights on the enhancement of ion transport efficiencies by modulating the self-assembly nature of polymer electrolytes by substituting with a single end-functional group.
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