| abstract |
A positive electrode for a lithium secondary battery, a lithium secondary battery, and a method for manufacturing a positive electrode for a lithium ion secondary battery capable of reducing a temporal decrease in discharge capacity accompanying storage while suppressing internal resistance. Provided. The formula (I) Li1 + xMnaCobNicM1yO2 [M1 is at least one element selected from Fe, Cu, Al, Mg, Mo; 0 ≦ x ≦ 0.33, 0 ≦ a ≦ 1.0, 0 ≦ b ≦ 1.0, 0 ≦ c ≦ 1.0, 0 ≦ y ≦ 1.0, and a + b + c + y = 1 are satisfied. The transition metal present in the surface layer of the composite oxide has an average oxidation number in an uncharged state, tetravalent for Mn, trivalent for Co, and for Ni The positive electrode 10 for a lithium secondary battery, each of which is higher than divalent, and a boron-containing compound is present on the surface of the composite oxide. [Selection] Figure 1 |