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 and composite oxide technology, which is applied in secondary batteries, nickel compounds, chemical instruments and methods, etc., can solve the reactivity deterioration, easy sintering and coagulation, output characteristics and battery capacity reduction of lithium-ion secondary batteries And other issues

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

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Problems solved by technology

[0007] Furthermore, starting with sodium, potassium, calcium, magnesium, etc. will be solid-solved at lithium sites, so that the particles of lithium-nickel-manganese-cobalt composite oxides are easy to sinter and aggregate, and the reactivity of lithium-ion secondary batteries made using them deteriorates, and the output Features and reduced battery capacity

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

[0242] In Example 1, was added 0.9L of water within the crystallization step in the crystallization reaction tank (5L) was stirred, and the bath temperature was set at 40 ℃, nitrogen gas flow in the reaction vessel becomes a nitrogen atmosphere . At this time, the oxygen concentration in the reaction vessel to 2.0% by volume of space.

[0243] The reaction in the water tank, an appropriate amount of 25% aqueous sodium hydroxide and 25% aqueous ammonia as the ammonium ion donor, as the pH at a solution temperature of 25 deg.] C measured with reference to the pH in the reactor was 12.8 way becomes to adjust. Further, ammonium ion concentration in the reaction solution was adjusted to 10g / L.

[0244] Next, nickel sulfate, manganese sulfate, cobalt chloride dissolved in water to prepare 2.0mol / L feed solution. In this raw material solution, a molar ratio of each metal element becomes Ni: Mn: Co = 1: 1: 1 mode is adjusted. Further, as the alkali metal hydroxide and sodium hydroxide...

Embodiment 2

[0249]When in Example 2, nickel sulfate, manganese sulfate, cobalt chloride produced 2.0mol / L stock solution dissolved in water, the raw material solution at a molar ratio of nickel, manganese, cobalt becomes Ni: Mn: Co = 6 : 2: 2 mode is adjusted, except the same manner as in Example 1, to obtain a nickel-cobalt-manganese composite hydroxide.

Embodiment 3

[0251] When Example 3, nickel sulfate, manganese sulfate, cobalt chloride produced 2.0mol / L stock solution dissolved in water, the raw material solution at a molar ratio of nickel, manganese, cobalt becomes Ni: Mn: Co = 2 : 7: 1 is adjusted manner, except that the same manner as in Example 1, to obtain a nickel-cobalt-manganese composite hydroxide.

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Abstract

Provided is a nickel-manganese-cobalt composite hydroxide, which is characterized in that the hydroxide 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, the sodium content of the nickel-manganese-cobalt composite hydroxide being less than 0.0005 mass%. Furthermore, the invention is characterized in that the ratio of the average particle size of a 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, agglomerated primary particles or secondary particles composed of primary particles and secondary particles composed of nickel manganese cobalt composite hydroxide as a precursor of the positive electrode active material, a nickel-manganese a method for producing cobalt composite hydroxide, lithium nickel manganese cobalt composite oxide and a lithium ion secondary battery. The present application is based on January 22, 2019 submitted International Application No. PCT / JP2019 / 001797 and April 16, 2019 proposed International Application No. PCT / JP2019 / 016269 and claims priority basis, by referring to the application but cited to this application. Background technique [0002] In recent years, with the popularity of smart phones, tablet PCs and notebook personal computer terminals and other portable electronic devices, small and light as to a non-aqueous electrolyte secondary battery having...

Claims

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Application Information

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IPC IPC(8): H01M4/525H01M4/505
CPCH01M4/505H01M4/525Y02E60/10H01M10/0525C01P2004/50C01P2006/80C01P2006/12C01P2004/54C01P2002/54C01P2004/03C01P2004/61C01G53/50C01G53/006
Inventor 大下宽子渔师一臣
Owner SUMITOMO METAL MINING CO LTD
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