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Method for manufacturing positive electrode active material for secondary battery

A positive active material, secondary battery technology, used in secondary batteries, battery electrodes, positive electrodes, etc., can solve the problems of inability to ensure stability, large specific surface area, low particle strength, etc., achieve excellent stability, improve particle Strength, effect of reducing specific surface area

Pending Publication Date: 2020-10-16
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, conventionally developed NCM-based lithium composite transition metal oxides in the form of secondary particles aggregated from primary particles have a large specific surface area, low particle strength, a large amount of gas generated during battery operation due to a high content of lithium by-products, and lower stability limit
In other words, conventionally developed NCM-like lithium composite transition metal oxides are limited in their use for high-voltage batteries due to the inability to ensure their stability

Method used

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  • Method for manufacturing positive electrode active material for secondary battery
  • Method for manufacturing positive electrode active material for secondary battery
  • Method for manufacturing positive electrode active material for secondary battery

Examples

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preparation example Construction

[0020] The method for preparing a positive electrode active material for a secondary battery of the present invention comprises the steps of: providing a positive electrode active material precursor comprising a core and a shell, wherein the core contains nickel (Ni), cobalt (Co) and manganese (Mn ), and the shell portion contains cobalt (Co) and surrounds the core portion; formed by mixing the cathode active material precursor with a lithium raw material to obtain a mixture and firing the mixture at a temperature of 970° C. or higher A lithium composite transition metal oxide in the form of single particles.

[0021] The method of preparing the cathode active material will be described step by step in detail.

[0022] First, there is provided a positive electrode active material precursor including a core part and a shell part, wherein the core part contains nickel (Ni), cobalt (Co) and manganese (Mn), and the shell part contains cobalt (Co) and surrounds the Describe the nu...

Embodiment 1

[0087] In a batch 40L reactor set at 50°C, NiSO 4 、CoSO 4 and MnSO 4 Nickel:cobalt:manganese was mixed in water in such an amount that the molar ratio of nickel:cobalt:manganese was 57:20:23 to prepare a first transition metal solution having a concentration of 2.4M.

[0088] Add 13 liters of deionized water to the co-precipitation reactor (capacity: 40 L), and purge nitrogen gas into the reactor at a rate of 25 liters / min to remove dissolved oxygen in the water and create a non-oxidizing atmosphere in the reactor. atmosphere. Thereafter, 83 g of an aqueous NaOH solution having a concentration of 25% was added thereto, and the mixture was stirred at a temperature of 50° C. and a stirring speed of 700 rpm so as to maintain a pH of 11.5.

[0089] Afterwards, the first transition metal solution was input separately at a rate of 1.9 L / hour, and NaOH aqueous solution, NH 4 An aqueous OH solution was added thereto, and at the same time, a co-precipitation reaction was performed ...

Embodiment 2

[0094] The lithium composite transition metal oxide prepared in the same manner as in Example 1 was mixed with Al 2 o 3 mix. The mixed mixture was heat-treated at 500° C. for 3 hours in an air atmosphere to prepare a positive electrode active material formed with an Al-coated portion.

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Abstract

The present invention relates to a method for preparing a positive electrode active material for a secondary battery, the method comprising the steps of: preparing a positive electrode active materialprecursor that consists of a core part including nickel (Ni), cobalt (Co), and manganese (Mn) and a shell part surrounding the core part and including cobalt (Co); and mixing the positive electrode active material precursor and a lithium raw material and firing same at a temperature of 970 DEG C or higher to form a lithium composite transition metal oxide consisting of a single particle.

Description

technical field [0001] Cross References to Related Applications [0002] This application claims the benefit of Korean Patent Application No. 10-2018-0065528 filed with the Korean Intellectual Property Office on June 7, 2018, the disclosure of which is incorporated herein by reference in its entirety. technical field [0003] The invention relates to a method for preparing positive electrode active materials for secondary batteries. Background technique [0004] In recent years, with the rapid spread of electronic devices using batteries, such as mobile phones, laptop computers, electric vehicles, etc., demand for secondary batteries that are small in size, light in weight, and relatively high in capacity have grown rapidly. [0005] In the state where an organic electrolyte or a polymer electrolyte is filled between the positive electrode and the negative electrode (the positive electrode and the negative electrode are made of active materials capable of intercalating...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00C01G51/04H01M4/36H01M4/525H01M4/505
CPCH01M4/36H01M4/505H01M4/525Y02E60/10C01P2004/45C01P2004/51C01P2004/61C01P2002/60C01P2004/03C01P2002/76C01G53/44C01P2004/84C01P2006/80C01G51/04H01M4/366C01P2006/40H01M4/0471H01M4/131H01M4/134H01M4/1391H01M4/1395H01M4/364H01M10/0525H01M2004/028
Inventor 李银熙金成培朴英洙林一朗
Owner LG CHEM LTD
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