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학술지 Enhanced Separator Properties by Thermal Curing of Poly(Ethylene Glycol)Diacrylate-Based Gel Polymer Electrolytes for Lithium-Ion Batteries
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김광만, Beta Zenia Poliquit, 이영기, 원정하, 고장면, 조원일
Electrochimica Acta, v.120, pp.159-166
Porous polyethylene (PE) or nonwoven poly(vinylidene fluoride) (PVdF) separator-supported gel polymer electrolytes are realized by thermal polymerization of a precursor solution consisting of poly(ethylene glycol)diacrylate (PEGDA) and an electrolyte solution (1 M LiPF6 in an equal-volume mixture of ethylene carbonate and dimethyl carbonate). The polymerization conditions are optimized to include a PEGDA content of 3 wt.% in the precursor solution and subsequent heat treatment at 80 C for 10 min. Even though the gelled PEGDA electrolyte has a lower ionic conductivity than the electrolyte solution, a LixCoO2/graphite full-cell that has a gel electrolyte with optimized PEGDA content on the PVdF separator achieves a battery performance superior to the one with PE. The best battery performances achieved are a high discharge capacity (116 mAh g-1), a good high-rate capability (95 mAh g-1 at 5.0 C-rate), and a high capacity retention ratio (90%) after the 100th cycle. This enhancement is due to the incorporation of a polar electrolyte solution that is entrapped by the polar PEGDA matrix within the nonwoven PVdF separator, which is a more suitable host that is able to well absorb and preserve the gel electrolyte. © 2013 Elsevier Ltd.
KSP 제안 키워드
Dimethyl carbonate(DMC), Electrolyte solution, Full cell, Gel polymer electrolyte, High capacity retention, High discharge capacity, Ion batteries, PVdF separator, Poly(ethylene glycol) diacrylate, Polyethylene (pe), Polymerization conditions