Method of forming a solid state cathode for high energy density secondary batteries

A method of forming a solid state cathode comprising the steps of:

• a) forming a generally planar substrate;
• b) forming a substantially alkali-free first solution comprising at least one transition metal and at least two ligands;
• c) spraying said first solution onto said substrate while maintaining said substrate at a temperature between about 100 and 400° C. to form a first solid film containing said transition metal on said substrate;
• d) forming a second solution comprising at least one alkali metal, at least one transition metal, and at least two ligands;
• e) spraying said second solution onto said first solid film on said substrate while maintaining said substrate at a temperature between about 100 and 400° C. to form a second solid film containing said alkali metal and at least one transition metal;
• and,
• f) heating to a temperature between about 300 and 1000° C. in a selected atmosphere to react said first and second films to form a homogeneous cathode film.