| 摘要 |
PROBLEM TO BE SOLVED: To provide nickel manganese composite hydroxide particles having high surface Mn/Ni ratio and high grain size uniformity in which dispersibility of the active material in a positive electrode can be improved, and to provide a production method thereof.SOLUTION: When producing a nickel manganese composite hydroxide by crystallization reaction, nucleation is performed by controlling the pH value of an aqueous solution for nucleation containing a metal compound containing nickel and a metal compound containing manganese and an ammonium ion supply body to be 12.0-13.4 measured on the basis of a liquid temperature of 25°C. Subsequently, the nuclei are grown by controlling the pH value of an aqueous solution for growing the particles containing the nuclei thus formed to be 10.5-12.0 measured on the basis of a liquid temperature of 25°C and lower than the pH value in the nucleation process, and the Mn/Ni ratio of the liquid part in the solution is increased on the way of crystallization. |
