Preparation and performance of a novel core-shell Gel Polymer Electrolytes
A novel core-shell latex Gel Polymer Electrolytes (GPE) based on poly (methyl methacrylate-acrylonitrile -styrene) (P(MMA-AN-ST)) was prepared for applications in Li-ion batteries. The structure and the performance of the polymer and the GPE were characterized with FTIR, DSC/TG, TEM, SEM, LSV and CA. It is shown that the copolymer has a high thermal stability up to 320°C and the porous structure of the membrane was formed effectively. As-prepared gel polymer electrolytes exhibits a high ionic conductivity of 3.52×10−3 Scm−1 at 25°C and it is electrochemically stable up to 5.2V (vs. Li). This novel GPE can be potentially applied to the manufacture of PLBs.
Novel porous polymer electrolyte based on polyacrylonitrile
Abstract High porous poly(hydroxyethyl acrylate- co -acrylonitrile) [P(HEA-AN)] membranes were prepared by a phase inversion method. Porous polymer electrolytes are prepared by soaking the porous membranes in the electrolyte solution. The ionic conductivity of the porous polymer electrolytes was found to be as high as 3.66 × 10 −3  S cm −1 . The membrane structure changed with the different processing conditions. With increasing mole ratio of AN in the copolymer, the cross-sectional structure of the membrane changes from finger-like to honeycomb-like and ionic conductivity of porous polymer electrolytes is improved. As the polymer concentration increases, the pore diameter of porous membrane decreases and ionic conductivity of porous polymer electrolyte is improved obviously.
Effect of molecular weight of polymeric additives on formation, permeation properties and hypochlorite treatment of asymmetric polyacrylonitrile membranes
Abstract Asymmetric polyacrylonitrile membranes were prepared via phase inversion process from casting solution composed of synthesized polyacrylonitrile (PAN), dimethylsulfoxide (DMSO), and poly(vinylpyrrolidone) (PVP) of different molecular weights. The effect of molecular weight of PVP in the casting solution on the morphology, water flux was investigated. The effect of hypochlorite treatment on PVP which was entrapped in pore was investigated. As the higher molecular weight of PVP is added, the thicker top layer of the asymmetric membrane is. The top layer of the membrane and the suppression of macrovoid formation strongly depend on the molecular weight of PVP. The addition with different molecular weight of PVPs also changes pure water permeability. It is also found that the substantial amount of PVP is entrapped in the pores, the water flux decreases. The effect of pore-filling depends on the molecular weight of the additive. Using sodium hypochlorite solution, the entrapped PVP was able to be partially removed. The effectiveness of the selective bleach is pronounced for a higher molecular weight of PVP, which results in higher water permeability, compared to untreated membranes.