The structure presented is a high-capacity micro battery, lithium based, consisting of porous cathode, solid electrolyte and silver anode. A spinel LiNi0.4La0.1Mn1.5O4 sol–gel layer was deposited on a porous ceramic substrate to give high specific surface to the chip-like microbatteries. The anode used was thermally evaporated Ag and the electrolyte a sol–gel hybrid Li4SiO4 layer.