Process for the fabrication of a lithium-ion battery in thin layers

Formation of lithium-ion battery involves forming insulating layer (12) with opening, over substrate (10); depositing stack (30, 32) comprising layers of cathode collector, cathode, electrolyte and anode, and having smaller thickness than insulating layer; forming anode collector layer (28) over structure for filling space remaining in opening; and planarizing structure to expose insulating layer. The method further involves forming protection layer over structure and above anode collector layer; and forming conductive region (40) on protection layer. An independent claim is included for lithium-ion battery comprising conductive substrate, supporting insulating layer comprising first opening; and a stack along walls and filling the first opening.