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Positive electrode active material for lithium ion secondary batteries, lithium ion secondary battery, and method for producing positive electrode active material for lithium ion secondary batteries

A positive active material, secondary battery technology, applied in active material electrodes, electrode manufacturing, secondary batteries, etc., can solve problems such as capacity reduction, and achieve the effect of inhibiting battery expansion

Active Publication Date: 2020-08-21
SUMITOMO METAL MINING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Oxygen from Li 1-x NiO 2 detachment in the medium, forming an electrochemically inactive NiO phase, which reduces the capacity

Method used

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  • Positive electrode active material for lithium ion secondary batteries, lithium ion secondary battery, and method for producing positive electrode active material for lithium ion secondary batteries
  • Positive electrode active material for lithium ion secondary batteries, lithium ion secondary battery, and method for producing positive electrode active material for lithium ion secondary batteries
  • Positive electrode active material for lithium ion secondary batteries, lithium ion secondary battery, and method for producing positive electrode active material for lithium ion secondary batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0187] 1. Manufacture of lithium-nickel composite oxide particles

[0188] The positive electrode active material was produced by implementing the following steps.

[0189] (a) Precursor crystallization process

[0190] First, 2.5 L of pure water was put into a reaction tank (5 L), and the temperature in the tank was set to 40° C. while stirring. The inside of the reaction tank at this time is a nitrogen atmosphere with an oxygen concentration of 1% by volume or less. Add an appropriate amount of 25% by mass sodium hydroxide aqueous solution and 25% by mass ammoniacal liquor to the water in the reaction tank to prepare the initial aqueous solution so that the pH value is 11.5 and the ammonia concentration is 5g / L (initial aqueous solution) based on a liquid temperature of 25°C. modulation).

[0191] Dissolve nickel sulfate, cobalt sulfate, aluminum sulfate in pure water simultaneously, make the mass ratio of nickel, cobalt and aluminum be Ni: Co: Al=0.82: 0.15: 0.03, prepar...

Embodiment 2

[0249] When carrying out the coating process of "3. Production of positive electrode active material", in the preparation of the coating agent, the titanium surface amount of the target coating layer is set to 14 μmol / m 2 , except that, under the same conditions as in Example 1, lithium nickel composite oxide particles, a positive electrode active material, and a secondary battery using the positive electrode active material were obtained. The above evaluation results are shown in Tables 1 to 2.

Embodiment 3

[0251] When carrying out the coating process of "3. Production of positive electrode active material", in the preparation of the coating agent, the titanium surface amount of the target coating layer is set to 29 μmol / m 2 , except that, under the same conditions as in Example 1, lithium nickel composite oxide particles, a positive electrode active material, and a secondary battery using the positive electrode active material were obtained. The above evaluation results are shown in Tables 1 to 2.

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Abstract

The purpose of the present invention is to provide a positive electrode active material for lithium ion secondary batteries, which has high capacity and excellent cycle characteristics, while suppressing expansion of a battery due to generation of a gas, and which achieves a good balance among the above-described functions at high levels. A positive electrode active material for lithium ion secondary batteries, which comprises particles of a lithium nickel composite oxide and cover layers that at least partially cover the surfaces of the particles of the lithium nickel composite oxide. This positive electrode active material for lithium ion secondary batteries is characterized in that: the components of the lithium nickel composite oxide other than oxygen are expressed as Li:Ni:Co:M = t:1- x - y:x:y (wherein M represents at least one element selected from the group consisting of Mg, Al, Ca, Si, Ti, V, Fe, Cu, Cr, Zn, Zr, Nb, Mo and W; 0.95 <= t <= 1.20; 0 < x <= 0.22; and 0 <= y <= 0.15); the cover layers contain a Ti compound; and the Ti amount per 1 m2 of the surface area of the lithium nickel composite oxide is from 7.0 [mu]mol to 60 [mu]mol (inclusive).

Description

technical field [0001] The present invention relates to a positive electrode active material for a lithium ion secondary battery having lithium nickel composite oxide particles and a coating layer covering at least a part thereof, a lithium ion secondary battery, and a method for producing the positive electrode active material for a lithium ion secondary battery. This application claims priority based on Japanese Patent Application No. Japanese Patent Application No. 2017-217552 filed in Japan on November 10, 2017, and this application is incorporated into the present application by reference. Background technique [0002] In recent years, along with the popularization of portable information terminals such as smartphones and tablet PCs, development of small and lightweight secondary batteries having high energy density and durability has been strongly desired. In addition, development of a high-output secondary battery is strongly desired as a power source for an electric ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525C01G53/00H01M4/36H01M10/052H01M10/0566
CPCH01M4/525C01G53/00H01M10/0525H01M4/485H01M2004/021H01M4/366H01M50/109Y02E60/10H01M4/0471H01M2004/027H01M2004/028H01M50/46
Inventor 冈本辽介
Owner SUMITOMO METAL MINING CO LTD
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