NOVELTY - A particulate cathode material comprises electroactive material containing lithium-manganese-iron-phosphate compound in which a portion of electroactive material has an olivine structure.    USE - A particulate cathode material for nanocomposite used for battery cathode of lithium battery (all claimed) for electric vehicles, hybrid electric vehicles, plug-in hybrid electric vehicles, aerospace vehicles and equipment, e-bikes, and electronic and electrical devices, such as computers, (video) cameras, cell phones, personal digital assistants (PDAs), music players, tools, television, toys, video game players, household appliances, and medical devices e.g. pacemakers and defribrillators.    ADVANTAGE - The cathode material provides high specific capacities, very good cycle life, and high energies even at high discharge rates.    DETAILED DESCRIPTION - A particulate cathode material comprises electroactive material of formula LiaMnbFecDdPO4 in which a portion of the electroactive material has an olivine structure. INDEPENDENT CLAIMS are included for:    (1) nanocomposite containing greater than or equal to 70 wt.% particulate cathode material and less than or equal to 30 wt.% graphite, carbon black, and/or other conductive carbon;    (2) battery cathode comprising cathode material or nanocomposite;    (3) lithium battery comprising anode, cathode, separator disposed between anode and cathode, and electrolyte solution containing greater than or equal to 1 lithium salt; and    (4) manufacture of olivine lithium manganese transition metal phosphate cathode material which involves forming mixture of greater than or equal to 1 lithium precursor, greater than or equal to 1 iron precursor, greater than or equal to 1 manganese precursor, greater than or equal to 1 dopant metal precursor, and greater than or equal to 1 precursor of HxPO4 ions in which mole ratio of lithium ions to HxPO4 ions is 0.85-1.15, mole ratio of manganese ions to HxPO4 ions is 0.65-0.95, mole ratio of iron ions to HxPO4 ions is 0.049-0.349, mole ratio of dopant metal ions to HxPO4 ions is 0.001-0.1, and mole ratio of lithium, manganese, iron, and dopant metal ions combined to HxPO4 ions is given by (moles Li+(2x moles Mn)+(2x moles Fe)+(2x moles dopant metal))=(2.75x moles HxPO4)-(3.1x moles HxPO4), milling the mixture, and calcining milled mixture.    a=0.85-1.15;    b=0.65-0.95;    c=0.049-0.349;    d=0.001-0.1;    a+2b+2c+dv'=2.75-3.1;    V'=valence of D;    D=metal ion e.g. Mg, Ca, Sr, Co, Ti, Zr, Ti, Mo, V, Nb, Ni, Sc, Cr, Cu, Zn, Be, La, and/or Al; and    x=0, 1, or 2.    DESCRIPTION OF DRAWING(S) - The drawing shows a graph of the relationship between specific capacity and number of cycles of a battery.