Our "Sulfone-Modified Polyether Sulfone (S-PES)" exhibits high proton selectivity for RFB electrolyte membrane applications.
Vanadium-based redox flow batteries (RFBs) are expected to be promising as large secondary batteries due to their excellent charge-discharge cycle durability and safety. Currently, the electrolyte membrane material commonly used is perfluorocarbon sulfonic acid polymer, but its high cost is believed to hinder widespread practical application. Hydrocarbon-based materials with sulfonic acid groups introduced into aromatic polymers are being investigated. Our company has produced a dense membrane of S-PES and evaluated its performance as an electrolyte membrane for RFBs. As a result, the membrane durability was found to be as strong as that of perfluorocarbon membranes, and the crossover (proton selectivity) showed approximately five times better results compared to perfluorocarbon membranes. *For more details, please refer to the PDF document or feel free to contact us.*
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basic information
【Example of S-PES Quality】 ■Appearance: Light brown powder ■Sulfonic acid group introduction rate: 30% ■Weight average molecular weight: 130,000 ■Moisture: ≦3% ■Development stage: Pilot results available *For more details, please refer to the PDF document or feel free to contact us.
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【Crossover Test Results】 ■S-PES Membrane ・Membrane Durability: 1.0 / Crossover: 1.1×10^-7 cm²/min ■Perfluorocarbon Membrane ・Membrane Durability: 1.0 / Crossover: 4.8×10^-7 cm²/min ■S-PEEK Membrane ・Membrane Durability: 3.7 / Crossover: 1.1×10^-6 cm²/min *For more details, please refer to the PDF document or feel free to contact us.
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KONISHI Chemical Industry Co., Ltd. develops, manufactures, sells, and provides contract manufacturing of functional chemicals used in a wide range of applications, including information electronic materials, functional resins, specialty monomers, silicon-based organic/inorganic hybrid materials, and pharmaceutical intermediates. We strive to translate new technologies and customer needs into chemistry in our own way, challenging ourselves to design new functional materials.