MANGANESE COMPOSITE HYDROXIDE PARTICLE, POSITIVE POLE ACTIVE MATERIAL FOR NONAQUEOUS ELECTROLYTE SECONDARY BATTERY, AND NONAQUEOUS ELECTROLYTE SECONDARY BATTERY, AND METHOD FOR PRODUCING THEM

• Main Author: TOYA HIROMASA
• Format: Patent
• Language: English
• Published: 13.12.2012
• Subjects: BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F; ELECTRICITY; INORGANIC CHEMISTRY; METALLURGY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

PROBLEM TO BE SOLVED: To provide a lithium/manganese composite oxide particle having a small and uniform particle size with a hollow structure; and a method for producing such a lithium/manganese composite oxide particle.SOLUTION: This manganese composite hydroxide particle is obtained through a nucleation step and a particle growth step. The nucleation step is conducted such that an aqueous solution for nucleation including a metal compound containing manganese and an ammonium ion supply source is subjected to a crystallization reaction by controlling pH to be 12.0 to 14.0 based on liquid temperature of 25°C and in ambient atmosphere to generate nuclei. The particle growth step is conducted such that the aqueous solution containing nuclei formed in the nucleation step is controlled so that pH falls in the range of 10.5 to 12.0 based on liquid temperature of 25°C to be lower than that of the nucleation step, and the atmosphere is changed to an inert atmosphere within 30% of total time from the beginning of the particle growth step to grow the nuclei. The manganese composite hydroxide particle obtained in the particle growth step is mixed with a lithium compound, and the mixture is fired to obtain the lithium/manganese composite oxide particle.