Patent ID: 9099738
Filing Date: 2015-08-04
Classification: H01M,Y02E,Y02T

Abstract:
1. A method for making a positive electrode material for a secondary battery, the method comprising: selecting a cathode active material in powder form; preparing a particle slurry by mixing a first selected binder and a first selected solvent with the cathode active material; evaporating the first selected solvent to thereby form a quantity of elongated polycrystalline flakes of the cathode active material; separating or classifying the flakes by passing the flakes through and onto selected metal screens having mesh sizes of 230 Mesh or smaller, thereby providing classified flakes having a longest dimension greater than about 50 μm; preparing a flake slurry by combining the classified flakes with a filler powder, a conductive powder and a second binder with a second selected solvent, wherein the filler powder includes a metal oxide material or a metal phosphate material or a combination of metal oxide and metal phosphate materials; coating the flake slurry on a conductive substrate; heating the coated conductive substrate to evaporate the second selected solvent in said flake slurry, wherein said filler powder is incorporated with said cathode active material; and pressing the coated conductive substrate to a given positive electrode thickness for the secondary battery.