Lithium Metal Composite Oxide Having Layered Structure

A lithium metal composite oxide having a layered structure,

• which is represented by a general formula (1):
• Li1+xNi1−x-α-β-γMnαCoβMγO2 (wherein 0≤x≤0.1, 0.01≤α≤0.35, 0.01≤β≤0.35, 0≤γ≤0.05, and M comprises at least one or more elements selected from the group consisting of Al, Mg, Ti, Fe, Zr, W, Y, and Nb),
• wherein an amount of residual alkali present in secondary particles (according to the following measurement method;
• referred to as “residual alkali amount in secondary particles”) is 0.05 to 0.4 wt %,
• wherein in the method of measuring the residual alkali amount in secondary particles,
• the lithium metal composite oxide is pulverized such that an average particle diameter (D50) thereof becomes 5 to 50%;
• 10.0 g of the lithium metal composite oxide after the pulverization is dispersed in 50 mL of ion-exchanged water, immersed therein for 15 min, and thereafter filtered;
• and the filtrate is titrated with hydrochloric acid (Winkler method), and
• at this time, by using phenolphthalein and bromophenol blue as indicators, a total amount of an amount of LiOH and an amount of Li2CO3 is calculated based on the discoloration of the filtrate and the amount of titration at this time, and a mass ratio (wt %) of the total amount to the amount of the lithium metal composite oxide is set as a residual alkali amount in secondary particles.