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Positive electrode active material, manufacturing method thereof, and lithium secondary battery comprising same

A positive electrode active material and manufacturing method technology, which is applied to secondary batteries, battery electrodes, circuits, etc., can solve the problems of limitations and reduced stability of lithium secondary batteries, and achieve the effect of improving mobility and structural stability

Active Publication Date: 2021-06-11
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the zirconia of the positive electrode active material produced by the above-mentioned technology exists only on the surface, so there is a limitation in ensuring the movement path of lithium ions
In addition, since the zirconia used is only composed of tetragonal and / or cubic crystal structures that are prone to phase transitions, there is also a volume loss caused by the phase transition of zirconia during the use of lithium secondary batteries. The problem that the stability of the lithium secondary battery decreases due to swelling

Method used

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  • Positive electrode active material, manufacturing method thereof, and lithium secondary battery comprising same
  • Positive electrode active material, manufacturing method thereof, and lithium secondary battery comprising same
  • Positive electrode active material, manufacturing method thereof, and lithium secondary battery comprising same

Examples

Experimental program
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Effect test

Embodiment 1

[0086] will Ni 0.80 co 0.15 al 0.05 (OH) 2 The metal hydroxide precursor represented by LiOH, the lithium compound represented by LiOH and ZrO 2 ·Y 2 o 3 (Y 2 o 3 The zirconia represented by the content ratio: 0.02mol%) was put into a dry powder mixer, and uniformly mixed to manufacture a mixture. At this time, the mixing ratio of the metal hydroxide precursor and the lithium compound was set at a molar ratio of 1:1.01, and the ratio of the monoclinic structure (X m ) is 1 zirconia.

[0087] Next, the above-mentioned mixture was fired once at 750° C. for 15 hours under an oxygen atmosphere to obtain a solid. After that, the resulting solids were pulverized and classified to produce LiNi substituted with zirconia 0.80 co 0.15 al 0.05 o 2 composed of powder.

[0088] Next, the produced powder was washed with water at room temperature for 30 minutes to remove residual lithium. At this time, the ratio of powder:water was set to a weight ratio of 1:1.5. Thereafter, ...

Embodiment 2

[0091] Using the ratio of the monoclinic structure (X m ) was 0.75 zirconium oxide, and a positive electrode active material was produced by the same method as in Example 1 above.

manufacture example 1 and 2

[0097]The positive active material manufactured in Examples 1 and 2 was mixed with PVDF (polyvinylidene fluoride) as a binder, acetylene black as a conductive material in a weight ratio of 96:2:2, and added as a solvent. NMP (N-Methyl pyrrolidone (N-Methyl pyrrolidone)), so as to produce positive electrode slurry. The produced positive electrode slurry was coated on an aluminum foil, rolled, and dried in a vacuum dryer at 130° C. to produce each positive electrode.

[0098] Using a positive electrode manufactured in the future, a negative electrode of Li metal, a polypropylene separator, and 1M LiPF 6 Electrolytes mixed with EC / EMC / DEC (ethylene carbonate / ethyl methyl carbonate / diethyl carbonate) in a weight ratio of 5:2:3 were used to manufacture lithium secondary batteries in the form of button cells.

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Abstract

The present invention relates to a positive electrode active material and a manufacturing method thereof, and a lithium secondary battery containing the positive electrode active material. The positive electrode active material is characterized in that it contains lithium composite metal oxide and zirconia, and the X-ray diffraction spectrum of the zirconia It has the first peak that appears when the diffraction angle 2θ is 27-29° and the second peak that appears when the diffraction angle 2θ is 30.5-32.5°. In the positive electrode active material of the present invention, zirconium oxide containing a monoclinic crystal structure exists not only on the surface but also inside, so when it is applied to a lithium secondary battery, it is possible to ensure the mobility of lithium ions and structural stability to improve the capacity and life characteristics of lithium secondary batteries.

Description

technical field [0001] The present invention relates to a positive electrode active material used in the production of a lithium secondary battery and a production method thereof. Background technique [0002] Batteries generate electricity by using substances capable of electrochemical reactions in the positive and negative electrodes. As a typical example of such batteries, there is a lithium secondary battery in which electric energy is generated by a change in chemical potential when lithium ions are intercalated / deintercalated in a positive electrode and a negative electrode. [0003] The above-mentioned lithium secondary battery is manufactured by using a substance capable of repeated intercalation / deintercalation of lithium ions as active materials of a positive electrode and a negative electrode, respectively, and filling an organic electrolyte solution or a polymer electrolyte solution between the positive electrode and the negative electrode. [0004] Conventional...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/131H01M4/1391H01M4/485H01M10/0525
CPCH01M4/131H01M4/1391H01M4/485H01M10/0525Y02E60/10
Inventor 朴娜丽朴晟淳李琮熙
Owner LG CHEM LTD