Wetting Behavior of Aprotic Li–Air Battery Electrolytes

The open architecture of cathodes in Li–air batteries implies the need for porosity with adequate pore size distribution and surface energy optimization regard to electrolyte. interaction liquid cathode material, especially wetting properties, which depend on roughness porosity, electrolyte needs be understood properly avoid flooding assure high active areas. In this work, contact angle goniometry, capillary rise method, pressure saturation curves are used investigate properties dimethyl sulfoxide (DMSO), tetraethylene glycol ether (Tetraglyme), a 1:1 mixture ethylene carbonate (EC:DMC) water gas diffusion layer (GDL) Sigracet 39BC, pure flat polytetrafluorethylene (PTFE) foil. Contact measurement shows that all three organic solvents wet GDL hydrophobic agent PTFE. Capillary measurements show sample liquids slowly imbibe into porous network. While Tetraglyme an efficient penetration is limited by viscosity, flow rate slowed down network GDL. Pressure DMSO, Tetraglyme, EC:DMC can obtained first time compared curve.