Nickel-manganese composite hydroxide particles, method for producing same, positive electrode active material for nonaqueous electrolyte secondary batteries, method for producing said positive electrode active material, and nonaqueous electrolyte secondary battery

Abstract

Provided are nickel manganese composite hydroxide particles that are a precursor for forming cathode active material comprising lithium nickel manganese composite oxide having hollow structure of particles having a small and uniform particle size for obtaining a non-aqueous electrolyte secondary battery having high capacity, high output and good cyclability. When obtaining the nickel manganese composite hydroxide particles from a crystallization reaction, an aqueous solution for nucleation, which includes at least a metallic compound that contains nickel and a metallic compound that contains manganese, and does not include a complex ion formation agent that forms complex ions with nickel, manganese and cobalt, is controlled so that the temperature of the solution is 60 DEG C or greater, and so that the pH value that is measured at a standard solution temperature of 25 DEG C is 11.5 to 13.5, and after nucleation is performed, an aqueous solution for particle growth, which includes the nuclei that were formed in the nucleation step and does not substantially include a complex ion formation agent that forms complex ions with nickel, manganese and cobalt, is controlled so that the temperature of the solution is 60 DEG C or greater, and so that the pH value that is measured at a standard solution temperature of 25 DEG C is 9.5 to 11.5, and is less than the pH value in the nucleation step.

Description

technical field [0001] The present invention relates to nickel-manganese composite hydroxide particles as a precursor of a positive electrode active material for a non-aqueous electrolyte secondary battery, a method for producing the same, and a non-aqueous electrolyte secondary battery using the nickel-manganese composite hydroxide particle as a raw material A positive electrode active material, a method for producing the same, and a nonaqueous electrolyte secondary battery using the positive electrode active material for a nonaqueous electrolyte secondary battery as a positive electrode material. Background technique [0002] In recent years, with the popularization of portable electronic devices such as mobile phones and notebook computers, the development of small and lightweight non-aqueous electrolyte secondary batteries with high energy density has been strongly demanded. In addition, there is a strong demand for the development of high-output secondary batteries as p...

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Problems solved by technology

[0022] However, since the positive electrode active material disclosed in Patent Document 4 is a hollow particle, although an increase in the specific surface area can be expected compared with a solid particle, the particle diameter is not described.

Therefore, although the improvement of the reactivity with the electrolyte solution due to the increase in the specific surface area can be expected, the effect of micronization on the moving distance of the above-mentioned lithium ions is unclear, and sufficient improvement in output characteristics cannot be expected.

Furthermore, since the particle size distribution is considered to be equivalent to that of conventional positive electrode active materials, there is a high possibility that the particle selectivity will deteriorate due to the unevenness of the applied voltage in the electrode, and the battery capacity will decrease.

[0023] In summary, the current situation is that lithium composite oxides that can sufficiently improve the performance of lithium-ion secondary batteries and composite hydroxides that can be used as raw materials for the composite oxides have not yet been developed.

In addition, although various methods for producing composite hydroxides have been studied, no composite hydroxide that can be used as a raw material for composite oxides that can sufficiently improve the performance of lithium-ion secondary batteries on an industrial scale has been developed so far. method of manufacture

That is, a positive electrode active material with a small particle size and high particle size uniformity and a large reaction area, such as a hollow structure, has not yet been developed, and it is necessary to develop such a positive electrode active material and its industrial production method.

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