NOVELTY - A secondary battery comprises an electrode containing a conductive substrate (100) coated with flakes (120) that have a number average longest dimension greater than 60 mu m, where the flakes contains a metal oxide or metal phosphate material.    USE - As secondary battery (claimed) such as rechargeable lithium secondary batteries useful in portable electronic devices; and in emerging high power applications such as portable mechanical tools and hybrid or all-electric vehicles.    ADVANTAGE - The batteries exhibit high power and high energy density; and are improved high power lithium secondary batteries with good high rate behavior. The coatings contain active material flakes having a unique morphology that offers relatively high inter-particle connectivity. The flakes achieve general physical alignment within the coatings so that flakes within any given layer have multiple points of contacts with those from adjacent layers. This property provides secondary batteries with increased power and energy density compared to other morphologically different materials and particle shapes. The use of metal oxide flakes as cathode active materials gives rise to high power and high energy batteries.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) a positive electrode material comprising flakes that have a longest dimension greater than 100 mu m of a metal oxide or metal phosphate material;    (2) making positive electrode material for a secondary battery involving: preparing a quantity of polycrystalline flakes of a cathode active material; separating or classifying the flakes with the desired size by passing them through and onto selected metal screens; preparing a slurry of flakes by combining the classified flakes with a filler powder (130), a conductive powder and binder with a solvent; coating the slurry on a conductive substrate; heating the coated substrate to evaporate the solvent; and pressing the coated substrate to a desired final electrode thickness; and    (3) preparing polycrystalline flakes of cathode active material involving selecting a cathode active material; preparing a primary slurry by adding a binder and a solvent to the cathode active material; applying a layer of the primary slurry onto a substrate; drying the layer for a selected period of time and temperature; fragmenting the layer into elongated structures; and sintering the elongated structures at 400-1100 degrees C for 1 to 48 hours to form sintered polycrystalline flakes.    DESCRIPTION OF DRAWING(S) - The figure shows schematic view illustrating cathode or positive electrode with a coating formed with flakes.    Substrate layer (100)    Elongated structures or flakes (120)    Filler (130)    Predetermined thickness of cathode or active material coating (140)    Electrolyte (150)