Positive electrode material and lithium secondary battery using the same

A positive electrode material for a lithium secondary battery, comprising:

• a positive electrode active material represented by Li1+αNixCoyMnzMItO2 and having a layered rock salt-type crystal structure, wherein a, x, y, z, and t satisfy −0.1≤α≤0.5, x+y+z+t=1, 0.3≤x≤0.9, 0≤y≤0.55, 0≤z≤0.55, and 0≤t≤0.1 and, in a case of 0<t, MI is at least one element selected from Mg, Ca, Al, Ti, V, Cr, Si, Y, Zr, Nb, Mo, Hf, Ta, and W;
• an electron-conducting oxide represented by LapAe1−pCoqMII1−qO3−δ wherein p and q satisfy 0<p≤1 and 0<q<1 and, in a case of p<1, Ae is at least one element selected from alkaline earth metal elements, MII is at least one element selected from Mn and Ni, and δ is an oxygen deficiency level for achieving electrical neutrality;
• and
• a Li ion-conducting oxide including Li element, O element, and at least one element selected from W, P, Nb, and Si.