Positive electrode active material for nonaqueous electrolyte secondary batteries, method for producing same, and nonaqueous electrolyte secondary battery using same

A positive electrode active material and non-aqueous electrolyte technology, applied in the field of non-aqueous electrolyte secondary batteries, can solve the problems of damage performance, electrode density drop, battery performance drop, etc., achieve stable charge and discharge, inhibit grain boundary precipitation, and reduce deterioration Effect

Active Publication Date: 2018-11-23
BASF TODA BATTERY MATERIALS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such cracks lead to a reduction in conductive pathways, a decrease in electrode density, and a sharp drop in battery performance.
Therefore, in order to further improve the performance, it is necessary to solve the problem that its performance is gradually impaired due to the peeling of such crystalline interfaces, etc.

Method used

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  • Positive electrode active material for nonaqueous electrolyte secondary batteries, method for producing same, and nonaqueous electrolyte secondary battery using same
  • Positive electrode active material for nonaqueous electrolyte secondary batteries, method for producing same, and nonaqueous electrolyte secondary battery using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] An aqueous sodium hydroxide solution having a pH of 12.0 was prepared in a reactor equipped with a blade stirrer. Aqueous ammonia solution was dropped thereinto so that the ammonia concentration became 0.80 mol / l. A mixed aqueous solution of nickel sulfate, cobalt sulfate, and manganese sulfate was continuously supplied to the reactor at a composition ratio of Ni / Co / Mn=0.8 / 0.1 / 0.1. During this period, an aqueous sodium hydroxide solution and an aqueous ammonia solution were continuously supplied so that the pH of the reaction solution reached 12, the ammonia concentration reached 0.8 mol / l, and the particles grew to the target average secondary particle size. During this period, spherical composite transition metal precipitates were obtained by applying mechanical shear force to the suspension.

[0080] After the reaction, the taken-out suspension was washed with water by a filter press, and then dried at 150° C. for 12 hours to obtain nickel-cobalt-manganese compound ...

Embodiment 2

[0087] The composition ratio of the precursor was changed to Ni / Co / Mn=1.0 / 1.0 / 1.0, Li raw material, transition metal mixed spherical oxide, ZrO 2 , and La 2 o 3 The mixture was calcined at 850° C. for 10 hours in an oxidizing atmosphere, and then heat-treated at 630° C. for 8 hours in an air atmosphere as an annealing treatment. The calcined product after the annealing treatment was crushed to obtain positive electrode active material powder. Except for this, a positive electrode active material was obtained in the same manner as in Example 1.

[0088] The variation coefficient of Li / M including crystals and grain boundaries was 26.7% after elemental distribution analysis using NanoSIMS in the cross section of the grains. In addition, it was confirmed that Zr coexists at grain boundaries where the Li concentration is high.

[0089] As an auxiliary measurement, high-resolution TEM is used to analyze multi-wavelength interference patterns and selected area electron diffracti...

Embodiment 3

[0092]An aqueous sodium hydroxide solution having a pH of 12.0 was prepared in a reactor equipped with a blade stirrer. Aqueous ammonia solution was dropped thereinto so that the ammonia concentration became 0.80 mol / l. A mixed aqueous solution of nickel sulfate, cobalt sulfate, and sodium aluminate was continuously supplied to the reactor. During this period, an aqueous sodium hydroxide solution and an aqueous ammonia solution were continuously supplied so that the pH of the reaction solution reached 12, the ammonia concentration reached 0.8 mol / l, and the particles grew to the target average secondary particle size. During this period, spherical composite transition metal precipitates were obtained by applying mechanical shear force to the suspension.

[0093] After the reaction, the taken-out suspension was washed with water by a filter press, and then dried at 150° C. for 12 hours to obtain nickel-cobalt-aluminum compound particles (nickel-cobalt-aluminum composite hydrox...

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Abstract

The present invention provides a positive electrode active material which is suppressed in deterioration caused by repeated charging and discharging and enables stable charging and discharging, thereby enabling the achievement of higher output and longer service life of a nonaqueous electrolyte secondary battery. A positive electrode active material, which is composed of a layered lithium transition metal oxide represented by general formula Lia(NibCocAldMee)O2 (wherein Me=Mn, Mg, Ti, Ru, Zr, Nb, Mo or W; 1.00<=a<=1.15; 0.25<b<1; 0<c<=0.30; 0<=d<=0.05; and 0<=e<=0.40), is configured of secondary particles, each of which is composed of aggregated primary particles. With respect to the Li composition ratio of unreacted Li and Li produced by a decomposition reaction in the secondary particles, the variation coefficient of the Li composition ratio represented by Li / M (M = Ni+Co+Al+Me) is 30% or less.

Description

technical field [0001] The present invention relates to a positive electrode active material for a non-aqueous electrolyte secondary battery, a method for producing the same, and a non-aqueous electrolyte secondary battery using the same, and in particular to a positive electrode active material capable of performing stable charge and discharge with little degradation for repeated charge and discharge A substance, a method for producing the same, and a nonaqueous electrolyte secondary battery using the same. Background technique [0002] In recent years, the portability and wirelessization of electronic equipment such as AV equipment and personal computers have rapidly progressed. As a driving power source for these equipment, there is an increasing demand for small, lightweight, and high-energy-density secondary batteries. In addition, in recent years, electric vehicles and hybrid vehicles have been developed and put into practical use in order to protect the global environ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525C01G53/00H01M4/505
CPCC01G53/00H01M4/505H01M4/525Y02E60/10C01G53/50C01P2002/60C01P2004/61C01P2006/40H01M4/131H01M4/1391C01G53/44H01M4/485H01M10/052C01G53/42C01G53/66C01P2004/50H01M10/0525H01M2004/028
Inventor 梶山亮尚古贺一路脇山刚正木竜太山村贵幸松本和顺
Owner BASF TODA BATTERY MATERIALS LLC
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