NICKEL MANGANESE COMPOSITE HYDROXIDE PARTICLE AND PRODUCTION METHOD THEREOF, POSITIVE ELECTRODE ACTIVE MATERIAL FOR NONAQUEOUS ELECTROLYTE SECONDARY BATTERY AND PRODUCTION METHOD THEREOF, AND NONAQUEOUS ELECTROLYTE SECONDARY BATTERY

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.

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