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

A positive active material, secondary battery technology, applied in the direction of active material electrodes, electrode manufacturing, secondary batteries, etc., can solve problems such as 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

AI Technical Summary

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0157] (1) Preparation of positive electrode active material

[0158] 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 600° C. for 5 hours in air (oxygen concentration: 21% by volume) airflow (heat treatment step). 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.

[0159] 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).

[0160] For mixing, a vibrating mixer device (Turbula Type T2C manufactured by Willy A. Bachofen (WAB)) was used.

[0161] The lithium mixture obtained in the mixing step w...

Embodiment 2

[0195] so that the specific surface area becomes 1.89m 2 / g, except that the firing temperature was set at 720° C., a positive electrode active material and a secondary battery were obtained and evaluated in the same manner as in Example 1. The results are shown in Table 1.

Embodiment 3

[0197] so that the specific surface area becomes 0.80m 2 / g, except that the firing temperature was set at 780° C., a positive electrode active material and a secondary battery were obtained and evaluated in the same manner as in Example 1. The results are shown in Table 1.

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Abstract

A positive electrode active material for lithium ion secondary batteries, which contains a lithium metal composite oxide that contains Li, Ni, Co and element M in such amounts that the mass ratio Li:Ni:Co:M is expressed by (1+a):(1-x-y):x:y (wherein -0.05 <= a <= 0.50, 0 <= x <= 0.35, 0 <= y <= 0.35 and M represents at least one element that is selected from among Mg, Ca, Al, Si, Fe, Cr, Mn, V, Mo, W, Nb, Ti, Zr and Ta), and which is configured such that if a cross-section of a particle of the lithium metal composite oxide during charging at 4.3 V is subjected to linear analysis from the surface to the center of the particle by means of STEM-EELS, the thickness of a high oxygen release layer, which has an intensity ratio of a peak (the first peak) around 530 eV to a peak (the second peak) around 545 eV of 0.9 or less at an O-K end, is 200 nm or less, and the specific surface area thereof is from 0.7 m2 / g to 2.0 m2 / g (inclusive).

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): C01G53/00H01M4/36H01M4/505H01M4/525
CPCH01M4/525C01G53/00Y02E60/10H01M2004/028H01M4/366H01M10/0525H01M4/0471H01M4/505H01M2004/021
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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