NOVELTY - A composite electrode material comprises electroactive materials (A,B). Material (A) manifests mean voltage (M1), energy density (E1) and cycle life (C1) under high voltage cutoff conditions of 4.2 V or more, when incorporated into cathode of rechargeable battery. Material (B) manifests a mean voltage (M2) less than voltage (M1), energy density (E2) less than density (E1), and cycle life (C2) under high voltage cutoff conditions of 4.2 V or more, when incorporated in cathode of rechargeable battery. Cycle life (C2) is more than cycle life (C1).    USE - For cathode of rechargeable battery, such as lithium battery (both claimed), and for ultracapacitor, electrolysis cell, sensor and catalyst.    ADVANTAGE - The cathode formed using composite electrode material provides high power capacity, cycle life and voltage characteristics to rechargeable battery.    DETAILED DESCRIPTION - A composite electrode material comprises electroactive materials (A,B). The electroactive material (A) manifests a mean voltage (M1), an energy density (E1) and a cycle life (C1) under high voltage cutoff conditions of 4.2 V or more, when incorporated into cathode of rechargeable battery. The electroactive material (B) manifests a mean voltage (M2) which is less than mean voltage (M1), energy density (E2) which is less than energy density (E1), and cycle life (C2) under high voltage cutoff conditions of 4.2 V or more, when incorporated in cathode of rechargeable battery. The cycle life (C2) is more than cycle life (C1). The composite material manifests at least one of mean voltage (M3) which is more than mean voltage (M2), energy density (E3) which is more than energy density (E2), and cycle life (C3) under high voltage cutoff conditions of 4.2 V or more, when incorporated in cathode of rechargeable battery. The cycle life (C3) is more than cycle life (C1).    INDEPENDENT CLAIMS are included for the following:    (1) cathode, which contains the composite material;    (2) lithium battery; and    (3) manufacture of composite electrode material.    DESCRIPTION OF DRAWING(S) - The graph shows the relationship between voltage and specific capacity of composite material.