Lithium metal composite oxide particles, process of producing lithium metal composite oxide particles, electrode structure containing lithium metal composite oxide particles, process of producing electrode structure , and lithium secondary battery having electrode structure

An electrode structure for a lithium secondary battery using intercalation and deintercalation reactions of lithium ions, which comprises, as a main component material, lithium metal composite oxide particles which electrochemically intercalate and deintercalate lithium ions, the lithium metal composite oxide particles comprising a plurality of secondary particles in an elongated shape each comprised of a plurality of primary particles with an average particle size of 0.1 μm to 1 μm so aggregated as to form voids therebetween,

• wherein the sizes of the plurality of secondary particles in a long length direction are 5 μm to 14 μm,
• wherein the plurality of secondary particles comprises columnar secondary particles and planar secondary particles,
• wherein the sizes of the columnar secondary particles in a short length direction are 1 μm to 4 μm, and the thicknesses of the planar secondary particles are 0.1 μm to 0.3 μm, and
• wherein the lithium metal composite oxide particles have an elemental composition represented by the general formula:
• LixCoO2 (0<x≦1.2) or LixCo1-yMyO2 (0<x≦1.2, 0<y≦0.2), where M is an element selected from the group consisting of Ni, Mn, Ti, Fe, Al, Si, Y, Zr, Nb, and Mo.