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Method for preparing positive electrode active material for lithium secondary battery, positive electrode comprising positive electrode active material prepared by method, and lithium secondary battery

A cathode active material, lithium secondary battery technology, applied in the direction of secondary batteries, lithium storage batteries, battery electrodes, etc., can solve problems such as yield reduction, reactivity reduction, productivity reduction, etc., to achieve productivity improvement, reactivity improvement, The effect of increasing true density

Pending Publication Date: 2021-12-07
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, when the hydrate LiOH·H 2 When O is used as the lithium raw material, the reactivity between the lithium raw material and the precursor decreases, resulting in a lower yield and lower productivity

Method used

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  • Method for preparing positive electrode active material for lithium secondary battery, positive electrode comprising positive electrode active material prepared by method, and lithium secondary battery
  • Method for preparing positive electrode active material for lithium secondary battery, positive electrode comprising positive electrode active material prepared by method, and lithium secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0137] Lithium hydroxide hydrate (LiOH·H 2 O) crush once until the average particle size (D 50 ) to 100 μm, vacuum-dry at 130°C for 24 hours, and then carry out secondary crushing until the average particle size (D 50 ) reached 15 μm, thereby obtaining anhydrous lithium hydroxide (LiOH).

[0138] As the positive active material precursor, 4750g Ni 0.88 co 0.05 mn 0.07 (OH) 2 , 82gAl(OH) 3Mix with 1343 g of anhydrous lithium hydroxide (LiOH) prepared above. 5 kg of subdivided parts of the mixed powder were put into each of the upper and lower parts of a container with a size of 330 mm x 330 mm, and primary fired at 630° C. for 8 hours in an oxygen atmosphere having an oxygen partial pressure of 80% by volume or more.

[0139] The primary fired material (cake) obtained by the primary firing was finely pulverized using an ACM instrument (Hosokawa Micron Corporation, model name: 15BC). 9 kg of subdivided portions of the resultant were put into a container having a size of ...

Embodiment 2

[0143] A cathode active material was produced in the same manner as in Example 1 above except that the input amount of anhydrous lithium was adjusted to 1318 g.

experiment example 1

[0157] In order to compare the productivity of the positive electrode active material manufactured in the above-mentioned Examples 1 and 2 and Comparative Examples 1-5, in the batch production furnace of the same volume by the method of Examples 1 and 2 and Comparative Examples 1-5 in The amount of positive electrode active material produced in one month was measured, and the results are shown in Table 1 below.

[0158] [Table 1]

[0159] Productivity (ton / month) Example 1 900 Example 2 900 Comparative example 1 90 Comparative example 2 700 Comparative example 3 700 Comparative example 4 900 Comparative Example 5 355

[0160] Referring to the above Table 1, it can be seen that compared with the positive electrode active materials produced in Comparative Examples 1 to 3 using hydrated lithium hydroxide as a lithium raw material and Comparative Example 5 in which a firing step was performed, the positive electrode active ...

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Abstract

The present invention provides a method for manufacturing a positive electrode active material for a lithium secondary battery, and a positive electrode for the lithium secondary battery and the lithium secondary battery comprising the positive electrode active material manufactured by the manufacturing method. The method comprises a first step of dry-mixing a transition metal hydroxide and an anhydrous lithium raw material; a second step of firing the mixture of the transition metal hydroxide and the anhydrous lithium raw material for the first time; and a third step of finely grinding and mixing the primarily fired material, and performing secondary firing to obtain a lithium transition metal oxide, wherein the anhydrous lithium raw material is mixed in an amount of 40 parts by weight or less based on 100 parts by weight of the transition metal hydroxide.

Description

technical field [0001] Cross References to Related Applications [0002] This application claims priority and benefit from Korean Patent Application No. 10-2020-0003833 filed on January 10, 2020, the disclosure of which is incorporated herein by reference in its entirety. technical field [0003] The present invention relates to a method of manufacturing a positive electrode active material for a lithium secondary battery, a positive electrode for a lithium secondary battery including the positive electrode active material manufactured by the manufacturing method, and a lithium secondary battery. Background technique [0004] Due to the technological development and increase in demand for mobile devices, the demand for secondary batteries as energy sources has increased dramatically. Among these secondary batteries, lithium secondary batteries having high energy density and high voltage, long cycle life, and low self-discharge rate have been commercialized and widely us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00H01M4/131H01M4/485H01M4/505H01M4/525H01M10/052
CPCC01G53/44H01M4/505H01M4/525H01M4/485H01M4/131H01M10/052Y02E60/10C01G53/50C01P2004/60C01P2004/61C01P2006/40C01P2004/51H01M4/366H01M4/62H01M10/4235H01M2004/028C01P2004/80H01M4/0471H01M4/5825H01M10/0525H01M2004/021
Inventor 郭益淳蔡昌完南孝姃田惠智
Owner LG CHEM LTD
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