Provided is a process for producing an alkali metal battery, comprising: (A) Preparing an anode material suspension and a cathode active material suspension; (B) Assembling a porous cell framework composed of a first conductive foam structure, a second conductive foam structure, and a porous separator disposed between said first and said second conductive foam structure; and (C) Injecting the anode suspension into pores of the first conductive foam structure to form an anode and injecting cathode suspension into pores of the second conductive foam structure to form a cathode, wherein the anode active material has a material mass loading no less than 20 mg/cm2 or the cathode active material has a material mass loading no less than 15 mg/cm2 for an organic or polymer material or no less than 40 mg/cm2 for an inorganic material. The resulting batteries exhibit exceptional gravimetric and volumetric energy densities and long cycle life.