Patent ID: 7858222

Claim:
A process for producing a separator-electrode unit comprising an inorganic separator layer which comprises at least two fractions of metal oxide particles which differ from each other in their average particle size and/or in the metal, the separator layer comprising metal oxide particles having an average particle size (D g ) which is greater than the average pore size (d) of the pores of the porous electrode that are adhered together by metal oxide particles having an average particle size (D k ) which is smaller than the pores of the porous electrode, which process comprises: forming a porous inorganic coating separator layer on a porous electrode substrate capable of functioning as a positive (cathode) or negative (anode) electrode in a lithium battery by applying a suspension which comprises metal oxide particles in a sol and solidifying the inorganic separator layer on the electrode by at least one thermal treatment, the suspension comprising metal oxide particles having an average particle size (D g ) which is greater than the average pore size (d) of the pores of the porous electrode, wherein the separator-electrode unit comprises a porous electrode and a separator layer applied to said porous electrode.