3D Printing of Micro Electrolyte Film by Using Micro-pen-writing

Micron-scaled electrolyte film of the PVA- H2SO4 polymer has received substantial attention because of the ability to assemble micro-capacitors, micro batteries, and organic light emitting diodes. However, the suitable thin film is still hardly available because of the high viscosity material, limiting the performance of final products. Herein, a direct writing method based on the micro pen was proposed to prepare an electrolyte film with several microns. First, uniform thin polymer lines were written to test the stability of the propose a method. Then, the relations between those parameters and the film thickness measured by the optical profilometer were obtained. Finally, a film, with the thickness down to 4μm, was printed by utilizing the suitable process parameters (i.e., the substrate speed v, the gap between the nozzle outlet and the substrate H, and the applied pressure p), showing a promising way for printing micro sandwich structures for energy storage.