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

Abstract

The subject of the invention provides nickel-manganese composite hydroxide particles having a small and uniform particle diameter and a hollow structure; and a method for producing the nickel-manganese composite hydroxide particles. When a nickel-manganese composite hydroxide is obtained by a crystallization reaction, an aqueous solution for nucleation, which contains a metal compound containing nickel, a metal compound containing manganese, and an ammonium ion donor, is controlled to have a pH value of 12.0-13.4 as measured at a reference liquid temperature of 25 DEG C and nucleation is carried out in an oxidizing atmosphere, and then an aqueous solution for particle growth, which contains the thus-formed nuclei, is controlled to have a pH value of 10.5-12.0 as measured at a reference liquid temperature of 25 DEG C and the nuclei are grown, while switching the atmosphere from the oxidizing atmosphere having an oxygen concentration of more than 1% by volume to a mixed atmosphere of an inert gas and oxygen with an oxygen concentration of 1% by volume or less.

Description

technical field [0001] The present invention relates to a nickel-manganese composite hydroxide particle and a production method thereof, a positive electrode active material for a non-aqueous electrolyte secondary battery using the nickel-manganese composite hydroxide particle as a raw material, a production method thereof, and the non-aqueous electrolyte A non-aqueous electrolyte secondary battery using a positive electrode active material for a 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 personal computers, the development of small and lightweight non-aqueous electrolyte secondary batteries with high energy density has been eagerly expected. In addition, the development of a high-output secondary battery as a power source for driving an engine, particularly as a battery for a power source for conveyance equipment, has been earnest...

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Problems solved by technology

[0022] However, the positive electrode active material disclosed in Patent Document 4 is a hollow particle. Therefore, 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 the micronization on the movement distance of the above-mentioned lithium ions is not clear, 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 researches have been conducted on methods for producing composite hydroxides, 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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