Patent ID: 6197450
Filing Date: 2001-03-06
Classification: H01G,H01L,H01M,H05K,Y02E,Y02P,Y10T

Abstract:
A thin-film micro-electrochemical energy storage cell (MEESC) in the form of a microbattery, said microbattery comprising:a substrate having two surfaces,a thin layer anode consisting of alkali metal (M), alkali metal alloy or in the charged state consisting of lithiated carbon or graphite,a thin layer cathode consisting of LiCoO.sub.2, LiNiO.sub.2, LiMn.sub.2 O.sub.4, TiS.sub.2, V.sub.2 O.sub.5, V.sub.3 O.sub.8 or lithiated forms of the vanadium oxides,a solid electrolyte intermediate to said anode and cathode layers, consisting of a tin layer of an ionically conducting or electronically non-conducting material selected from glass, poly(ethylene oxide) based polymer electrolyte or polycrystalline material, andoptionally, a fourth current collector layer;said anode or cathode layer being deposited in sequence on both surfaces of said substrate, said microbattery being characterized in that the substrate is provided with a plurality of through cavities of arbitrary shape, with an aspect ratio greater than 1, the diameter of said cavities being from about 15.mu. to about 150.mu.; said anode, cathode, solid electrolyte layers and optional current collector layer being also deposited throughout the inner surface of said cavities.