NEGATIVE ELECTRODE ACTIVE MATERIAL FOR LITHIUM ION SECONDARY CELL, METHOD FOR MANUFACTURING NEGATIVE ELECTRODE ACTIVE MATERIAL FOR LITHIUM ION SECONDARY CELL, AND LITHIUM ION SECONDARY CELL

DRIVE April 2, 2025
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A positive electrode active material for a lithium ion secondary battery containing lithium nickel manganese complex oxide particles, wherein the lithium nickel manganese complex oxide particles are composed of secondary particles in which primary particles of a lithium nickel manganese complex oxide represented by a general formula LidNi1-a-b-cMnaMbZrcO2+α (where M is at least one element selected from Co, W, Mo, Mg, Ca, Al, Ti, Cr, and Ta, and is 0.05 ≦ a < 0.60, 0 ≦ b < 0.60, 0.00003 ≦ c ≦ 0.03, 0.05 ≦ a + b + c ≦ 0.60, 0.95≦d≦ 1.20, and -0.2 ≦ α ≦ 0.2), wherein at least a portion of zirconium is dispersed in the primary particle, and wherein an amount of a positive active material for a lithium ion secondary battery in which an amount of excessive lithium determined by a neutralization titration method is 0.02 mass% or more and 0.09 mass% or less.

Discussion in the ATmosphere

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