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추호동,이국주,임상현,김태현 한국고분자학회 2018 Macromolecular Research Vol.26 No.8
Silicon has been considered as the next-generation anode material for Liion batteries due to its high capacity, but suffers from isolated conducting agents due to its large volume expansion and pulverization during cycling, causing rapid decays in performance. Using conjugated polymer binders bearing functional groups that bind Si was suggested to overcome this problem due to their electronic conductivity and enhanced mechanical properties. But conjugated polymers are generally prepared via organometallic intermediates, and are hence very difficult to purify and mass produce. Here, a novel conjugated polymeric binder based on ethylene dioxythiophene (EDOT) and phenylene (EP) was prepared using direct arylation, and then characterized. Specifically, the electrically conductive EP binder showed an enhanced adhesion to Si, and the electrode made of EP showed a capacity of 2250 mAh g-1 at its 1st cycle and 670 mAh g-1 at the 50th cycle, much higher than those of the electrode made of a poly(vinylidene fluoride) (PVdF) binder.
Roshni Lilly Thankamony,김태현,추호동,임상현,임태은,김영준 한국고분자학회 2015 Macromolecular Research Vol.23 No.1
The synthesis and properties of a solvent-free gel polymer electrolyte based on an imidazolium-poly(ethyleneoxide) (PEO)-based ionene electrolyte, a poly(vinylidene fluoride-hexafluoropropylene) (PVDF(HFP)) support, andthe lithium bis(trifluoromethane sulfonyl) imide (LiTFSI) salt are reported. A ternary gel polymer electrolyte film,produced from mixtures of the imidazolium-PEO-based ionene ([IPI][Br]), PVDF(HFP), and LiTFSI, displayedgood thermal and mechanical stability. A very high room temperature conductivity of 2.6×10-3 S/cm and a broadelectrochemical stability window were obtained, demonstrating the utility of the electrolyte for practical Li-ion battery applications.