The invention discloses a preparation method of a double-side coated positive
pole piece and a
solid-state battery, and belongs to the technical field of
solid-state batteries. A positive active material, a
solid electrolyte and a conductive agent are taken as raw materials, a glue solution and a
solvent are added and stirred to prepare positive
slurry, and the positive
slurry is coated on two sides of a
current collector and is subjected to
vacuum drying to prepare the double-side coated positive
pole piece. The invention also provides a solid battery which is prepared by laminating the double-sided coated positive
pole piece prepared by the method, an
electrolyte pole piece and a negative pole piece. According to the invention, the operation content of double-sided
coating of the positive pole piece is simplified, the step of combining multiple current collectors is avoided, the thickness of the double-sided
coating layer of the positive pole piece can be controlled, the
utilization rate of the positive pole
slurry is improved to the maximum extent, and the
energy density of the battery is improved; steps existing between the two positive electrodes during single-side
coating are eliminated, the problems of unevenness of positive
electrode planes and breakage of current collectors are avoided, and comprehensive and good contact of positive
electrode /
electrolyte interfaces is kept.