SiO2 nanoparticles-coated poly(paraphenylene terephthalamide) nonwovens as reinforcing porous substrates for proton-conducting, sulfonated poly(arylene ether sulfone)-impregnated composite membranes

Bendable and Thin Sulfide Solid Electrolyte Film: A New Electrolyte Opportunity for Free-Standing and Stackable High-Energy All-Solid-State Lithium-Ion Batteries

“…In addition, the PPTA NW is very light (0.8 mg cm –2 ) and constitutes only 14% of the mass of the NW-SE film (SE-NW-SE). This PPTA NW, which is known as a high-performance polymer with good thermal, chemical, and electrochemical stability, , serves as a mechanically compliant scaffold that provides flexibility and toughness to the NW-SE film. Especially, the PPTA NW is stable up to ∼400 °C (Supporting Information Figure S1), which demonstrates that the inclusion of organic component, PPTA NW, does not significantly degrade the intrinsic advantage of excellent thermal stability of sulfide SEs.…”

Alcohol-Treated Porous PTFE Substrate for the Penetration of PTFE-Incompatible Hydrocarbon-Based Ionomer Solutions

“…As shown in Figure S1, the bubble point and average pore diameters of PTFE were observed to be approximately 0.31 and 0.24 μm, respectively, indicating quite smaller pore size than those of other porous substrates. 10,13,15 Under ambient conditions, the prerequisite condition for a penetrating solution into the pores is that θ < 90°to satisfy the Young− Laplace equation for a positive capillary pressure difference. Therefore, for the penetration of highly viscous SPAES50 solution (see the Supporting Information for the characteristic details of synthesized SPAES50) into the porous PTFE substrate during a process time scale (∼10 s), the contact angle (θ) of SPAES50 solution on the PTFE substrate is required to be less than 90°.…”

“…A dimensionally and mechanically stable proton exchange membrane (PEM) is required to improve the performance and lifetime of proton exchange membrane fuel cells (PEMFCs), proton exchange membrane water electrolyzers (PEMWEs), and vanadium redox flow batteries (VRFBs). − As one of the strategies for a mechanically tough PEM, the composite membranes incorporated with porous polymer substrates, such as polytetrafluoroethylene (PTFE), − polyimide (PI), − poly­(paraphenylene terephthalamide) (PPTA), , polyamideimide (PAI), and polyacrylonitrile (PAN), , have received considerable attention, since these porous substrates lead to the suppression of the ionomer swelling, improving the dimensional stability and mechanical strength of the membranes, especially under hydrated condition. Among these porous polymer materials, PTFE is regarded as the most suitable candidate for a porous substrate due to its excellent chemical resistance and mechanical properties. , …”