Jeon, JD Cho, BW Kwak, SY 2024-01-21T05:07:28Z 2024-01-21T05:07:28Z 2021-09-03 2005-04-27 0378-7753 https://pubs.kist.re.kr/handle/201004/136534 Highly porous membranes composed of poly(vinylidene fluoride-co-hexafluoropropylene) [P(VdF-HFP)] and poly(ethylene oxide-coethylene carbonate) [P(EO-EC)] were prepared by a phase inversion method. The existence of viscous P(EO-EC) in the membranes not only contributed to the flexibility and high porosity but also led to a decrease in the mechanical strength. In an attempt to enhance the mechanical properties of porous membranes, a thermal annealing technique was considered a promising approach. When the membranes were annealed at 110C for 2h in an ordinary vacuum oven, they showed a highly ordered pore structure (i.e., honeycomb-like structure) and had a smaller pore size than unannealed membranes. This contributed to enhancement of mechanical strength in the membranes. Instead of organic solvent, viscous P(EO-EC) complexed with LiCF33SO (was added to the pores of annealed and unannealed membranes. thereby producing solvent-free polymer electrolytes. Polymer electrolytes based on annealed membranes exhibited a high uptake value of the P(EO-EC)/LiCF)(SO)(3)(3) Mixture and had a maximum conductivity value of 3.5 x 10-5 S cm-1 at room temperature, which is similar to that of unannealed membrane-based polymer electrolytes. Their conductivities were observed to increase with increasing P(EO-EC) content in the membranes due to this high uptake. Considering the foregoing facts, the mechanical properties of porous membranes can be improved by the thermal annealing without risking any deterioration of porosity, uptake, and electrochemical performance. 2005 Elsevier B.V. All rights reserved. English ELSEVIER SCIENCE BV IONIC-CONDUCTIVITY ELECTROCHEMICAL PROPERTIES ETHYLENE CARBONATE RECHARGEABLE BATTERIES INTERFACIAL PROPERTIES LITHIUM BATTERIES PHASE INVERSION PLASTICIZER MECHANISM NETWORKS Solvent-free polymer electrolytes based on thermally annealed porous P(VdF-HFP)/P(EO-EQ membranes Article 10.1016/j.jpowsour.2004.12.005 1 JOURNAL OF POWER SOURCES, v.143, no.1-2, pp.219 - 226 JOURNAL OF POWER SOURCES 143 1-2 219 226 scie scopus 000229166600027 2-s2.0-17744385583 Chemistry, Physical Electrochemistry Energy & Fuels Materials Science, Multidisciplinary Chemistry Electrochemistry Energy & Fuels Materials Science Article IONIC-CONDUCTIVITY ELECTROCHEMICAL PROPERTIES ETHYLENE CARBONATE RECHARGEABLE BATTERIES INTERFACIAL PROPERTIES LITHIUM BATTERIES PHASE INVERSION PLASTICIZER MECHANISM NETWORKS solvent-free polymer electrolyte porous membrane thermal annealing rechargeable lithium batteries