Nickel-manganese-cobalt composite hydroxide, production method for nickel-manganese-cobalt composite hydroxide, lithium-nickel-manganese-cobalt composite oxide, and lithium ion secondary battery

A composite hydroxide, composite oxide technology, applied in secondary batteries, nickel compounds, chemical instruments and methods, etc., can solve the problems of output characteristics and battery capacity reduction, deterioration of reactivity of lithium ion secondary batteries, etc.

Pending Publication Date: 2021-08-31
SUMITOMO METAL MINING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Furthermore, the lithium-nickel-manganese-cobalt composite oxide particles are easily sintered and agglomerated by solid-solution of potassium, calcium, magnesium, etc. at the lithium sites, starting with sodium, and the reaction of the lithium-ion secondary battery produced using the particles performance deterioration, output characteristics and battery capacity decrease

Method used

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  • Nickel-manganese-cobalt composite hydroxide, production method for nickel-manganese-cobalt composite hydroxide, lithium-nickel-manganese-cobalt composite oxide, and lithium ion secondary battery
  • Nickel-manganese-cobalt composite hydroxide, production method for nickel-manganese-cobalt composite hydroxide, lithium-nickel-manganese-cobalt composite oxide, and lithium ion secondary battery
  • Nickel-manganese-cobalt composite hydroxide, production method for nickel-manganese-cobalt composite hydroxide, lithium-nickel-manganese-cobalt composite oxide, and lithium ion secondary battery

Examples

Experimental program
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Effect test

Embodiment 1

[0253] In Example 1, the temperature in the tank was set to 40° C. while adding 0.9 L of water and stirring in the crystallization reaction tank (5 L) in the crystallization step.

[0254] In the water in the reaction tank, 25% sodium hydroxide aqueous solution and 25% ammonia water as an ammonium ion donor were added in an appropriate amount, and the pH of the reaction solution in the tank was adjusted to 12.8 as the pH measured based on the liquid temperature of 25°C. In addition, the ammonium ion concentration of the reaction solution was adjusted to 10 g / L.

[0255] Next, nickel sulfate, manganese sulfate, and cobalt chloride were dissolved in water to prepare a 2.0 mol / L raw material solution. In this raw material solution, the element molar ratio of each metal was adjusted to Ni:Mn:Co=1:1:1. Further, sodium hydroxide as an alkali metal hydroxide and sodium carbonate as a carbonate were mixed so that [CO 3 2- ] / [OH - ] was dissolved in water so that it became 0.025, a...

Embodiment 2

[0261] In embodiment 2, when nickel sulfate, manganese sulfate, cobalt chloride are dissolved in water to make the raw material solution of 2.0mol / L, the mol ratio of the nickel in the raw material solution, manganese, cobalt is adjusted to Ni:Mn: Except that Co=6:2:2, nickel-manganese-cobalt composite hydroxide was obtained in the same manner as in Example 1.

Embodiment 3

[0263] In embodiment 3, when nickel sulfate, manganese sulfate, cobalt chloride are dissolved in water to make the raw material solution of 2.0mol / L, the mol ratio of the nickel in the raw material solution, manganese, cobalt is adjusted to Ni:Mn: Except that Co=2:7:1, it carried out similarly to Example 1, and obtained the nickel-manganese-cobalt composite hydroxide.

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Abstract

Provided is a nickel-manganese-cobalt composite hydroxide that is a precursor for a positive electrode active material and is composed of secondary particles obtained by aggregating primary particles containing nickel, manganese and cobalt, or is composed of the primary particles and the secondary particles, said nickel-manganese-cobalt composite hydroxide being characterized in that the sodium content of the nickel-manganese-cobalt composite hydroxide is less than 0.0005 mass%, and the porosity of the nickel-manganese-cobalt composite hydroxide particles is greater than 50% but not greater than 80%. Further provided is a lithium-nickel-manganese-cobalt composite oxide characterized in that the ratio of the average particle size of the lithium-nickel-manganese-cobalt composite oxide divided by the average particle size of the nickel-manganese-cobalt composite hydroxide precursor thereof is 0.95-1.05, and when 100 or more randomly selected particles are observed using a scanning electron microscope, the number of observed secondary particle aggregates relative to the total number of observed secondary particles is 5% or less.

Description

technical field [0001] The present invention relates to a nickel-manganese-cobalt composite hydroxide as a precursor of a positive electrode active material, a manufacturing method of a nickel-manganese-cobalt composite hydroxide, a lithium nickel-manganese-cobalt composite oxide, and a lithium ion secondary battery. The nickel-manganese-cobalt composite hydroxide The hydroxide is composed of secondary particles in which primary particles containing nickel, manganese, and cobalt are aggregated, or primary particles and secondary particles. This application claims priority based on International Application No. PCT / JP2019 / 001795 filed on January 22, 2019 and International Application No. PCT / JP2019 / 016267 filed on April 16, 2019, and is incorporated by reference to these applications to this application. Background technique [0002] In recent years, with the popularization of portable electronic devices such as smartphones, tablet terminals, and notebook personal computers,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/505
CPCH01M4/505H01M4/525Y02E60/10H01M10/0525C01G53/006C01P2004/50C01P2004/61C01P2004/51C01P2006/12C01P2006/80C01P2006/14C01G53/50
Inventor 大下宽子渔师一臣
Owner SUMITOMO METAL MINING CO LTD
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