NOVELTY - An electrode material comprises surface-coated lithium composite phosphate particles containing iron on surface of lithium composite phosphate particles, and a carbon coating film coated on surfaces of lithium composite phosphate particles containing iron. The surface-coated lithium composite phosphate particles have lithium elution amount of 200-700 ppm and phosphorus elution amount of 500-2000 ppm, and are dipped in sulfuric acid solution having a pH of 4 for 24 hours.    USE - Electrode material is used for electrode-forming paste for electrode plate of lithium-ion battery (all claimed), lead storage battery and alkali storage battery. Uses include but are not limited to smart appliances, electric tool, electric vehicle, photovoltaic power generator and control system.    ADVANTAGE - The lithium-ion battery using the electrode material has excellent stability, cycle characteristics and durability, with suppressed elution of metal impurities other than lithium from electrode material. The electrode plate is easily produced using the electrode material.    DETAILED DESCRIPTION - An electrode material comprises surface-coated lithium composite phosphate (LixAyD'zPO4, where A is element(s) chosen from cobalt, manganese, nickel, copper and chromium, D' is element(s) chosen from magnesium, calcium, strontium, barium, titanium, zinc, boron, aluminum, gallium, indium, silicon, germanium, scandium, yttrium and rare-earth element, x is more than 0 and 2 or less, y is more than 0 and 1 or less, and z is 0-1.5) particles containing iron on surface of lithium composite phosphate particles, and a carbon coating film coated on surfaces of lithium composite phosphate particles containing iron. The surface-coated lithium composite phosphate particles have lithium elution amount of 200-700 ppm and a phosphorus elution amount of 500-2000 ppm, and are dipped in sulfuric acid solution having a pH of 4 for 24 hours. INDEPENDENT CLAIMS are included for the following:    (1) electrode-forming paste;    (2) electrode plate;    (3) lithium-ion battery; and    (4) production of electrode material.