3 research outputs found
Bio-based poly(hydroxy urethane)s for efficient organic high-power energy storage
Fast, low-cost and efficient energy storage technologies are urgently needed to balance the intermittence of sustainable energy sources. High-power capacitors using organic polymers offer a green and scalable answer. They require dielectrics with high permittivity (εr) and breakdown strength (EB), which bio-based poly(hydroxy urethane)s (PHUs) can provide. PHUs combine high concentrations of hydroxyl and carbamate groups, thus enhancing their εr, and a highly tuneable glass transition (Tg), which dictates the regions of low dielectric losses. By reacting erythritol dicarbonate with bio-based diamines, fully bio-based PHUs were synthesised with Tg ~ 50 °C, εr > 8, EB > 400 MV·m-1 and low losses (tan δ 6 J·cm-3) combined with a remarkably high discharge efficiency (η = 85%). These bio-based PHUs thus represent a highly promising route to green and sustainable energy-storage
Bio-based poly(hydroxy urethane)s for efficient organic high-power energy storage
International audienceFast, low-cost and efficient energy storage technologies are urgently needed to balance the intermittence of sustainable energy sources. High-power capacitors using organic polymers offer a green and scalable answer. They require dielectrics with high permittivity () and breakdown strength (), which bio-based poly(hydroxy urethane)s (PHUs) can provide. PHUs combine high concentrations of hydroxyl and carbamate groups, thus enhancing their , and a highly tuneable glass transition (), which dictates the regions of low dielectric losses. By reacting erythritol dicarbonate with bio-based diamines, fully bio-based PHUs were synthesised with ~ 50 °C, > 8, > 400 MV•m and low losses (tan δ 6 J•cm) combined with a remarkably high discharge efficiency, with η = 85% at and up to 91% at 0.5 . These bio-based PHUs thus represent a highly promising route to green and sustainable energy-storage