Abstract: A method for forming a solid electrolyte coating on a substrate (1), the method comprising: a. providing a first and a second electrode (3), b. coating a sol-gel precursor solution (4) of the solid electrolyte coating on the substrate (1) and electrically contacting the sol-gel precursor solution (4) with the first and the second electrode, the sol-gel precursor solution (4) being capable of forming a gel in presence of a voltage, and c. generating the voltage across the sol-gel precursor solution (4) via the first and the second electrodes, thereby transforming the sol-gel precursor solution (4) into a gel.