A5011529902- Advanced Battery Materials and Technologies
- Conducting polymers and applications
- Advancements in Battery Materials
- Fuel Cells and Related Materials
- Membrane Separation and Gas Transport
- Supercapacitor Materials and Fabrication
- Machine Learning in Materials Science
- Analytical Chemistry and Sensors
- Graphene research and applications
- X-ray Diffraction in Crystallography
- Semiconductor materials and interfaces
- Synthesis and properties of polymers
- Block Copolymer Self-Assembly
- Luminescence and Fluorescent Materials
- Ionic liquids properties and applications
Pohang University of Science and Technology
2012-2016
We have investigated a new means to control the morphology and conductivity of block copolymer electrolytes by inclusion ionic units at chain ends. A set poly(styrene-b-ethylene oxide) (PS-b-PEO) copolymers having dissimilar PEO end groups (-OH, -SO3H, -SO3Li) exhibited various self-assembled morphologies including disordered, lamellar, hexagonal cylindrical phases. Strikingly, addition Li salts PS-b-PEO with sulfonate terminal afforded enriched nanostructures significant differences in...
We have developed fast responsive, colorimetric and resistive-type polymeric humidity sensors from a series of self-assembled poly(styrenesulfonate-methylbutylene) (PSS-b-PMB) block copolymers with tailored hygroscopic properties. In dry state, the PSS-b-PMB films exhibit hexagonal cylindrical morphology where hydrophobic PMB cylinders are dispersed within PSS matrix. Under levels humidity, thin self-displayed discernible reflective color changes, covering almost entire visible light regions...
We present a facile synthetic route toward binder-free, highly-dispersed Ge nanoparticles in carbon matrices using one-step pyrolysis of self-assembled Ge-polymer hybrids. 3-Dimensionally arranged Ge-carbon exhibits remarkably enhanced cycling properties and rate capability compared with sheathed lacking organization.
We have investigated a new methodology for improving the ionic conductivity and cation transport of polymer electrolytes by incorporating an anion-stabilizing hard polymer. A lamellar-forming poly(ethylene oxide-b-dithiooxamide) (PEO-b-PDTOA) block copolymer having enhanced ion conduction mechanical strength, arising from PEO PDTOA, respectively, was synthesized. Compared to simple PEO/PDTOA blend, lithium salt-doped PEO-b-PDTOA exhibited significantly conductivity, which is ascribed...
Ion transport properties of block copolymers with lamellar morphologies, which contain ionic liquids (ILs), were investigated. By varying the type anion in ILs, dissimilar substructures microdomains identified using different elastic scattering techniques. decoupling segmental motion polymer chains from conductivity, a wide range normalized conductivities 0.03 to 0.6 (theoretical value 1) determined, depending on IL. The highest conductivity was achieved when ILs confined within domains...
We report a rational design of solid-state dry polymer electrolytes with high conductivity, mechanical strength, and improved cation transference number. Thiol–ene click chemistry provided orthogonal control over the type number end groups in poly(styrene-b-ethylene oxide) (PS-b-PEO) block copolymers. This approach permitted synthesis PEO chains reduced crystallinity, reminiscent oligomers, thereby playing key role improving room temperature conductivity. Intriguingly, incorporation diol or...