Electrochemical Process for Forming a Solid Electrolyte

A method for forming a solid-state battery comprising the steps of:

• forming a composite cathode electrode by
• providing a first and a second electrode,
• coating a sol-gel precursor solution of a solid electrolyte coating on a conductive substrate that is comprised in the first electrode and electrically contacting the sol-gel precursor solution with the first and the second electrode, the sol-gel precursor solution being capable of forming a gel in presence of a voltage, wherein the conductive substrate comprises a porous active electrode material and wherein coating the sol-gel precursor solution of the solid electrolyte coating on the substrate and electrically contacting the sol-gel precursor solution with the first and the second electrode results in impregnating the porous active electrode material with the sol-gel precursor solution, and
• generating the voltage across the sol-gel precursor solution via the first and the second electrodes, thereby transforming the sol-gel precursor solution into a gel;
• forming a solid electrolyte coating on an additional substrate by:
• providing a third and a fourth electrode,
• coating a sol-gel precursor solution of a solid electrolyte coating on the additional substrate that is conductive and that is comprised in the third electrode and electrically contacting the sol-gel precursor solution with the third and the fourth electrode, the sol-gel precursor solution being capable of forming a gel in presence of a voltage, wherein the additional substrate comprises a porous active electrode material and wherein coating the sol-gel precursor solution of the solid electrolyte coating on the additional substrate and electrically contacting the sol-gel precursor solution with the third and the fourth electrode results in impregnating the porous active electrode material of the additional substrate with the sol-gel precursor solution, and
• generating the voltage across the sol-gel precursor solution via the third and the fourth electrodes, thereby transforming the sol-gel precursor solution into a gel;
• and
• physically contacting the solid electrolyte material of the composite cathode electrode with the solid electrolyte coating present on the additional substrate.