| abstract |
[PROBLEMS] To provide a lithium ion battery positive electrode material having a high specific capacity, excellent high-temperature stability performance, safety, high-temperature charge / discharge cycle performance, a simple manufacturing process, and a relatively low manufacturing cost. The general formula is Li a Ni x Co y Mn z M b O 2 , of which 1.02 ≦ a ≦ 1.20, 0.0 ≦ b ≦ 0.5, 0.30 ≦ x. ≦ 0.60, 0.20 ≦ y ≦ 0.4, 0.05 ≦ z ≦ 0.50, x + y + z = 1, M element is Mg, Ti, Al, Zr, Y, Co, Mn, Ni, Ba 1 or 2 or more selected from rare earth elements, primary particles having a spherical or similar spherical shape under a scanning electron microscope, and secondary particles formed by aggregation of primary particle groups, A lithium ion battery positive electrode material in which the percentage by volume of secondary particles formed by aggregation of particle groups is 30% or less. [Selection] Figure 1-1 |