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Hybrid PVDF with cellulose acetate/AgTiO2 (CA-AgTiO2) nanofiber membranes have been successfully fabricated by electrospinning with excellent thermal stability, high porosity and superior electrolyte compatibility [116]. Polyimide (PI) nanofibrous membrane separators with bonding microstructures have been prepared via a dipping method by employing PAA (polyamic acid) as shown in Figure 5.5, which turned the loose-weak nonwoven structure to a compact robust fabric structure. This separator exhibits excellent high-rate capability and cycling stability at high temperature [119]. Figure 5.5 – Illustration for the preparation of PI nanofibrous membrane separator [119]. Novel blend separators have been developed by electrostatic spinning based on PAN/polyimide (PI) to improve the mechanical and electrochemical performances, the addition of PI increasing the porosity and fluid absorption rate of the membrane [121]. This membrane shows high ionic conductivity (0.2 mS.cm-1), wide electrochemical window (about 4.0 V), and excellent cycling performance (153 mAh.g-1 even after 50 cycles at 0.5 C) [121]. Organosoluble polyimide (PI) was used to fabricate high-performance separators with excellent thermal and mechanical stabilities, leading to separators with high heat resistance when compared to PP separators as shown in Figure 5.6 [122]. 29PDF Image | Synthetic Polymer-based Membrane for Lithium Ion
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CO2 Organic Rankine Cycle Experimenter Platform The supercritical CO2 phase change system is both a heat pump and organic rankine cycle which can be used for those purposes and as a supercritical extractor for advanced subcritical and supercritical extraction technology. Uses include producing nanoparticles, precious metal CO2 extraction, lithium battery recycling, and other applications... More Info
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