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

A positive electrode active material and secondary battery technology, applied in the direction of active material electrodes, electrode manufacturing, secondary batteries, etc., can solve the problem of thermal stability reduction and achieve the effect of inhibiting oxygen release

Pending Publication Date: 2021-10-01
SUMITOMO METAL MINING CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, if the nickel ratio is increased, as a negative effect, thermal stability decreases

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0154] (1) Preparation of positive electrode active material

[0155] The general formula with Ni as the main component: Ni 0.90 co 0.07 Al 0.03 (OH) 2 The metal composite hydroxide shown was heat-treated at 400° C. for 5 hours (first heat treatment step) and then at 700° C. for 5 hours (second heat treatment step) in air (oxygen concentration: 21% by volume) airflow. Thus, as a heat-treated metal complex compound, the general formula: Ni 0.90 co 0.07 Al 0.03 The metal composite oxide represented by O.

[0156] Next, Li / Me, which is the ratio of the number of atoms of lithium (Li) to the number of atoms of metals other than lithium (Me) in the resulting lithium mixture, was set to 1.01 for the metal composite oxide and lithium hydroxide obtained in the heat treatment step. The method was weighed and mixed sufficiently to obtain a lithium mixture (mixing process).

[0157] For mixing, a vibrating mixer device (Turbula Type T2C manufactured by Willy A. Bachofen (WAB)) wa...

Embodiment 2

[0189] In the crushing process, the particle size distribution is adjusted so that [(d90-d10) / volume average particle diameter] becomes 1.18, except that, the same operation as in Example 1 is carried out to obtain a positive electrode active material and a secondary battery, and carry out its evaluation. The results are shown in Table 1.

Embodiment 3

[0191] In the crushing process, the particle size distribution is adjusted so that [(d90-d10) / volume average particle diameter] becomes 0.85, except that, the same operation as in Example 1 is carried out to obtain a positive electrode active material and a secondary battery, and carry out its evaluation. The results are shown in Table 1.

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Abstract

This positive electrode active material for a lithium ion secondary battery contains a lithium metal composite oxide containing Li, Ni, Co, and an element M in the mass ratio Li:Ni:Co:M=1+a:1-x-y:x:y (wherein -0.05<=a<=0.50, 0<=x<=0.35, 0<=y<=0.35, and the element M is at least one chosen from the group consisting of Mg, Ca, Al, Si, Fe, Cr, Mn, V, Mo, W, Nb, Ti, and Zr). In a grain cross-section of the lithium metal composite oxide during charging at 4.3 V, if ray analysis is performed by STEM-EELS centered on the surface of a grain: the thickness of an oxygen easy-release layer is 200 nm or less, where the intensity ratio of a peak in the vicinity of 530 eV and a peak in the vicinity of 545 eV at the O-K edge is 0.9 or less; and [(d90-d10) / volume-average particle diameter], indicating the spread of granularity distribution, is 1.25 or less.

Description

technical field [0001] The present invention relates to a positive electrode active material for a lithium ion secondary battery, a method for producing the positive electrode active material for a lithium ion secondary battery, and a lithium ion secondary battery. 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 strongly desired. In addition, as batteries for electric vehicles (xEV) such as electric vehicles, various hybrid vehicles, and fuel cell vehicles, the development of secondary batteries excellent in capacity density is strongly desired. [0003] As a secondary battery satisfying such a request, there is a lithium ion secondary battery. A lithium-ion secondary battery is composed of a negative electrode, a positive electrode, an electrolyte, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00H01M4/525H01M4/36H01M4/505
CPCH01M4/525C01G53/00Y02E60/10H01M10/0525H01M4/0471H01M4/505H01M2004/028
Inventor 东间崇洋小川贵裕松浦祥之渔师一臣
Owner SUMITOMO METAL MINING CO LTD
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