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Positive electrode active material, method for producing same, and lithium secondary battery

A positive electrode active material, a positive electrode technology, applied in the field of positive electrode active material, its manufacture and lithium secondary battery, can solve the problems of unsatisfactory results, deterioration of battery performance, limited price competitiveness, etc., to improve electrochemical performance and long-term reliability, and the effect of suppressing oxidative decomposition reactions

Active Publication Date: 2019-10-18
LG CHEM LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among the above positive electrode active materials, LiCoO 2 It is widely used due to its excellent life characteristics and charge-discharge efficiency, but it has the following disadvantages due to its small capacity and high price due to limited resources of cobalt used as a raw material. Limitations in terms of price competitiveness
[0004] In order to make up for such shortcomings, the demand for nickel-rich system (Ni rich system) has begun to increase as the positive electrode active material of the secondary battery. The reaction, showing the deterioration of battery performance
[0005] Although the technology for effectively suppressing the reaction of the above-mentioned cathode active material with the electrolyte solution is currently being developed, satisfactory results have not yet been obtained

Method used

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  • Positive electrode active material, method for producing same, and lithium secondary battery
  • Positive electrode active material, method for producing same, and lithium secondary battery
  • Positive electrode active material, method for producing same, and lithium secondary battery

Examples

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Comparison scheme
Effect test

Embodiment 1

[0088] 1-1. Manufacture of cathode active material

[0089] In order to produce NCM-based positive electrode active materials, first, Ni is produced by co-precipitation reaction 0.8 co 0.1 mn 0.1 (OH) 2 After the precursor, LiOH was added as a lithium compound and heat-treated at 780 °C for 12 h to produce Li 1.01 Ni 0.8 co 0.1 mn 0.1 o 2 Represented positive active material.

[0090] After applying 10 parts by weight of tributyl phosphate to 100 parts by weight of the manufactured positive electrode active material, heat treatment was performed at 300° C. for 3 hours, thereby manufacturing the positive electrode active material of Example 1.

[0091] 1-2. Cathode manufacturing

[0092] 95 parts by weight of the positive electrode active material manufactured in Example 1-1, 2.5 parts by weight of the PvdF binder, and 2.5 parts by weight of carbon black as a conductive agent were dispersed in the NMP solution to prepare the slurry, which was coated on the Al colle...

Embodiment 2

[0096] The positive electrode active material of Example 2 was produced by implementing the same method as in Example 1 above except that triphenyl phosphate was used instead of tributyl phosphate.

[0097] Using the above-mentioned positive electrode active material, a positive electrode and a lithium secondary battery were respectively manufactured according to the same method as in Example 1.

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Abstract

PROBLEM TO BE SOLVED: To effectively suppress the decomposition reaction of an electrolytic solution by an organic phosphate coating layer formed on the surface, thereby significantly improving an electrochemical performance of an electrochemical device including it, especially that of a lithium secondary battery.SOLUTION: Provided are a positive electrode active material, a manufacturing method thereof, and a lithium secondary battery including the positive electrode active material. The positive electrode active material comprises: lithium transition metal oxide-based particles; and an organic phosphate coating layer partially or totally formed on the surface of each particle.SELECTED DRAWING: Figure 1

Description

technical field [0001] The present invention relates to a novel positive electrode active material, its production method, and an electrochemical element (preferably a lithium secondary battery) equipped with such a positive electrode active material. , so that the decomposition reaction between the positive electrode material and the electrolyte can be suppressed and the electrochemical performance of the lithium secondary battery can be significantly improved. Background technique [0002] In recent years, as the miniaturization of electronic equipment has required high-capacity secondary batteries, lithium secondary batteries, which have a higher energy density than nickel-cadmium batteries and nickel-hydrogen batteries, have attracted attention in particular. [0003] Lithium-containing cobalt oxide (LiCoO 2 ), in addition, the use of LiMnO with a layered crystal structure is also considered 2 , LiMn with spinel crystal structure 2 o 4 Lithium-containing manganese ox...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/137H01M4/505H01M4/525H01M4/60H01M10/0525
CPCH01M4/137H01M4/505H01M4/525H01M4/60H01M10/0525Y02E60/10
Inventor 崔权永潘盛皓朱熙严浚浩
Owner LG CHEM LTD
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