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Nonaqueous electrolyte secondary battery positive electrode active material, method for producing same, and nonaqueous electrolyte secondary battery which uses positive electrode active material

A positive electrode active material, secondary battery technology, applied in non-aqueous electrolyte batteries, active material electrodes, electrode manufacturing, etc., can solve the problems of poor output characteristics, deterioration of positive electrode active material crystallinity, increase in lithium, etc., and achieve high output. Characteristics, the effect of suppressing the formation of soluble lithium

Active Publication Date: 2020-06-16
SUMITOMO METAL MINING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the water washing treatment, there are disadvantages that the surface of the lithium metal composite oxide is damaged, and even the necessary lithium is eluted, and the output characteristics are deteriorated
[0010] However, when the heat treatment temperature is low, the reactivity between the lithium supply source and the metal hydroxide also decreases, so that unreacted excess lithium increases, and the crystallinity of the positive electrode active material deteriorates, etc., and it is necessary to easily elute from the positive electrode active material itself. Lithium
Therefore, when preparing the paste of the positive electrode active material, there is a concern that lithium will be dissolved in the solvent to cause gelation, resulting in a decrease in yield.

Method used

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  • Nonaqueous electrolyte secondary battery positive electrode active material, method for producing same, and nonaqueous electrolyte secondary battery which uses positive electrode active material
  • Nonaqueous electrolyte secondary battery positive electrode active material, method for producing same, and nonaqueous electrolyte secondary battery which uses positive electrode active material
  • Nonaqueous electrolyte secondary battery positive electrode active material, method for producing same, and nonaqueous electrolyte secondary battery which uses positive electrode active material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0144] [Metal composite hydroxide]

[0145] a) Manufacture of metal composite hydroxide powder

[0146] [(a) Manufacturing process of metal composite hydroxide]

[0147] First, nickel sulfate hexahydrate, cobalt sulfate heptahydrate, and manganese sulfate monohydrate are dissolved in water so that the molar ratio of nickel, manganese, and cobalt becomes Ni:Mn:Co=35:30:35, and, The raw material solution was prepared so that the concentration of nickel, manganese, and cobalt became 2 mol / L. On the other hand, 900 ml of water was added to a reaction tank with a capacity of 6 L until it overflowed, and the temperature in the tank was heated to 40° C. using a water bath, and nitrogen gas was introduced into the reaction tank at 3 L / min. Adjusted to an inert environment (oxygen concentration 0.2% by mass).

[0148] Then, while stirring the water in the reaction tank, the raw material solution, 25% by mass of ammonia water, and 25% by mass of sodium hydroxide solution were continu...

Embodiment 2

[0199] Lithium carbonate is finely pulverized using a jet mill until the maximum particle diameter in the particle size distribution is 8.0 μm or less and the average particle diameter is 4.0 μm or less. In addition, the same operation as in Example 1 was performed to obtain a positive electrode active material. and evaluate.

[0200] The evaluation results are shown in Table 1.

Embodiment 3

[0202] Lithium carbonate was finely pulverized using a jet mill until the maximum particle diameter in the particle size distribution was 4.1 μm or less and the average particle diameter was 2.5 μm or less. In addition, the same operation as in Example 1 was performed to obtain a positive electrode active material. and evaluate.

[0203] The evaluation results are shown in Table 1.

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Abstract

Provided are: a lithium nickel manganese cobalt complex oxide which improves the reactivity between a lithium starting material and a metal complex hydroxide, and is capable of achieving good low-temperature output properties when incorporated into a lithium ion secondary battery, even if no water washing treatment is performed; a method for producing the same; and a positive electrode active material which uses the complex oxide and does not suffer from gelling problems when preparing a paste. The provided nonaqueous electrolyte secondary battery positive electrode active material is a lithium metal complex oxide powder comprising secondary particles obtained by agglomerating primary particles including lithium, nickel, manganese and cobalt, or comprising both the primary particles and the secondary particles, the active material being characterized in that: the interior of the secondary particles is a primarily solid structure; the pH of the slurry is 11.5 or less; the soluble lithium content is 0.5 (mass%) or less; and the specific surface area is 1.0-2.0 (m<2> / g).

Description

technical field [0001] The present invention relates to a positive electrode active material for a nonaqueous electrolyte secondary battery, a method for producing the same, and a nonaqueous electrolyte secondary battery using the positive electrode active material. Background technique [0002] In recent years, with the popularization of portable electronic devices such as smartphones, tablet terminals, and notebook computers, small and lightweight non-aqueous electrolyte secondary batteries with high energy density have been used as batteries for hybrid vehicles and electric vehicles. Batteries, high output secondary battery development needs are expanding. [0003] A lithium ion secondary battery is mentioned as a secondary battery which can satisfy these demands. A lithium ion secondary battery is composed of a positive electrode, a negative electrode, and an electrolytic solution, and the active material of the positive electrode and the negative electrode uses a mater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/1391H01M4/505H01M10/052
CPCH01M4/1391H01M4/525Y02E60/10H01M2004/028H01M4/131H01M10/0525H01M4/505H01M4/0404H01M4/0471
Inventor 大下宽子渔师一臣相田平山地浩司冈田治朗
Owner SUMITOMO METAL MINING CO LTD