NOVELTY - The electrode material comprises an active material comprising lithium, cobalt, phosphate and two additional metals including iron, titanium, vanadium, niobium, zirconium, hafnium, molybdenum, tantalum, tungsten, manganese, copper, chromium, nickel and zinc, a conductive additive such as a carbon-based additive (0.5-5 wt.%), a coating applied over a portion of an outer surface of particles of the active material, and a composite particle comprising a particle of the active material and a metal oxide coating (0.1-2 wt.%) applied over a portion of the outer surface of the particle.    USE - The electrode material is useful in a battery (claimed) such as lead-acid, nickel-cadmium, nickel-zinc, nickel-iron, silver oxide, nickel metal hydride, rechargeable zinc-manganese dioxide, zinc-bromide, metal-air, and lithium batteries, which are useful as a power source for consumer electronics, portable electronics, hybrid vehicles, electrical vehicles, power tools, power grid, military applications and aerospace applications.    ADVANTAGE - The electrode material enhances specific energy, cell voltages, lifespan, thermal stability, discharge capacity, specific capacity, rata capability, cycling capability, discharge rate, lithium ion conductivity, electrical conductivity, lithium ion diffusivity, reversibility, energy efficiency and/or columbic efficiency of the batteries.    DETAILED DESCRIPTION - The electrode material comprises an active material comprising lithium, cobalt, phosphate and two additional metals including iron, titanium, vanadium, niobium, zirconium, hafnium, molybdenum, tantalum, tungsten, manganese, copper, chromium, nickel and zinc, a conductive additive such as a carbon-based additive (0.5-5 wt.%), a coating applied over a portion of an outer surface of particles of the active material, and a composite particle comprising a particle of the active material and a metal oxide coating (0.1-2 wt.%) applied over a portion of the outer surface of the particle. The active material has a molar ratio of cobalt to a total amount of cobalt and the additional metals of 0.5, a molar ratio of titanium to the total amount of cobalt, iron and titanium is 0.01-0.3, a molar ratio of vanadium to the total amount of cobalt, iron and vanadium is 0.05-0.2, and a molar ratio of niobium to the combined amount of cobalt, iron and niobium is 0.01-0.15. The electrode material has: a specific capacity at a voltage of 4.5 V, which is 10% of its specific capacity at a voltage of 2 V as measured upon discharge at a current of 150 mA/g from 4.95-2 V versus a lithium/lithium ion counterelectrode; a specific energy of 600 Wh/kg as measured upon discharge at the current of 7.5 mA/g from 4.95-2 V versus the lithium/lithium ion counterelectrode; and an average grain size of 1-100 nm. The specific capacity of the electrode material at the voltage of 2 V is 150 mAh/g. The additional metals are a transition metal other than cobalt, and a rare earth element. The electrode material includes an olivine phase, and a secondary phase including an oxide, a phosphate, a hydroxide, a carbonate and a nitrate of a second one of the additional metals. The olivine phase includes Li1-x-wCo1-y(Nw)(p)(My)(q)(PO4)1-a, where M is Group 2 elements, Group 13 elements, transition metals and rare earth elements, q is 0 or 1, y is 0-0.9, N is Group 1 elements, Group 2 elements, Group 13 elements and transition metals, p is 0-2, w is 0-0.3, x is 0 to -0.2 and a is -0.3 to 0.1. The electrode material comprises Li1-xCo1-y-zMyM'z(PO4)1-a, where M is iron, M' has an oxidation state of +4 in operation state of the electrode material and is titanium and vanadium, x is 0.05-0.2, z is 0.05-0.2 and y is 0.5-0.98. The electrode material is synthesized by milling a set of precursor materials and then calcining to form the electrode material. The coating comprises a material consisting of an electrochemically inert material and a metal oxide. INDEPENDENT CLAIMS are included for:    (1) a battery;    (2) a method of synthesizing an electrode material;    (3) a method of conditioning an electrode material;    (4) a method of conditioning a battery electrode; and    (5) a method of conditioning a battery.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic view of a lithium-ion battery.    Lithium-ion battery (100)    Anode (102)    Electrolyte (104)    Cathode (106)    Separator. (108)