Simple route for tuning the morphology and conductivity of block copolymer electrolytes: One end functional group is enough
SCIE
SCOPUS
- Title
- Simple route for tuning the morphology and conductivity of block copolymer electrolytes: One end functional group is enough
- Authors
- Jo, G; Ahn, H; Park, MJ
- Date Issued
- 2013-11
- Publisher
- ACS
- Abstract
- 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.
- Keywords
- BLOCK-COPOLYMER ELECTROLYTES; RECHARGEABLE LITHIUM BATTERIES; IONIC-CONDUCTIVITY; PHASE-BEHAVIOR; SOLID-STATE; MOLECULAR-WEIGHT; ORDER-DISORDER; SEPARATION; INTERFACE; LIQUIDS
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/15220
- DOI
- 10.1021/MZ400468M
- ISSN
- 2161-1653
- Article Type
- Article
- Citation
- ACS Macro Letters, vol. 2, no. 11, page. 990 - 995, 2013-11
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