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Cathode active material for secondary battery and preparation method thereof

An anode active material, secondary battery technology, applied in the direction of secondary battery, active material electrode, battery electrode, etc., can solve the problems of reducing battery effect and effect, and achieve high capacity, high stability, high output characteristics. Effect

Active Publication Date: 2019-05-21
ECOPRO BM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At this time, the surface layer of the particles combined with the coating substance is as thin as tens of nanometers or less. Due to the sharp combination difference between the coating layer and the volume of the particles, if the battery is used for more than hundreds of times for a long time, the effect will decrease.
In addition, there is also the problem that the effect of the battery will be reduced due to incomplete coating that the coating layer cannot be evenly distributed on the surface.

Method used

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  • Cathode active material for secondary battery and preparation method thereof
  • Cathode active material for secondary battery and preparation method thereof
  • Cathode active material for secondary battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Manufacture of Example 1 Lithium Composite Oxide

[0053] Prepared by co-precipitation reaction and expressed as Ni 0.98 co 0.02 (OH) 2 precursor. LiOH as a lithium compound and Al as an aluminum compound are added to the prepared precursor 2 o 3 1.4 moles, heat treatment to prepare the lithium secondary battery anode active material.

[0054] The composite metal compound obtained is washed with a washing solution containing 0.01mol% Mn, dried for 5 hours at 150° C. under the condition of 400 mmHg, and obtained as Li 1.01 Ni 0.913 co 0.07 al 0.014 mn 0.0001O2 secondary battery anode active material.

Embodiment 2

[0056] Except that the composite metal compound obtained is washed with a washing solution containing 0.02mol% Mn, the same conditions and methods as in Example 1 are used to obtain the compound represented by the chemical formula Li 1.01 Ni 0.912 co 0.07 al 0.014 mn 0.0002O2 secondary battery anode active material.

Embodiment 3

[0058] Except that the composite metal compound obtained is washed with water using a washing solution containing 0.03mol% Mn, the same conditions and methods as in Example 1 are used to obtain the compound represented by the chemical formula Li 1.01 Ni 0.911 co 0.07 al 0.014 mn 0.0003O2 secondary battery anode active material.

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Abstract

The present invention relates to a cathode active material for a secondary battery and a preparation method thereof, and more particularly, to a lithium composite oxide including a secondary particleformed as primary particles cohere, in which a manganese (Mn) oxide is present in the periphery of the primary particles, a concentration of an Mn oxide in the primary particle has a concentration gradient from the center of the primary particle to a surface of the particle, a concentration of an Mn oxide in the secondary particle has a concentration gradient from a surface of the secondary particle to the center thereof, and a lithium ion migration path is formed in the primary particle, and a preparation method thereof. A secondary battery including the cathode active material for a secondary battery may have high safety, while exhibiting high capacity and high output.

Description

technical field [0001] The present invention relates to a secondary battery anode active material and a method for producing the same, and in particular to a lithium composite oxide composed of secondary particles aggregated from primary particles, in which manganese oxide exists at the periphery of the primary particle, and the concentration of the Mn oxide ranges from A concentration gradient is shown from the center of the primary particle to the particle surface, a concentration gradient of Mn oxide is shown in the direction of the particle surface to the center in the secondary particle, and a lithium composite oxide including a lithium ion movement path in the primary particle and its method of manufacture. Background technique [0002] Lithium secondary batteries, which have been developed since the early 1990s and are used today, are lightweight and high-capacity batteries that are popular as power sources for portable devices. Compared with traditional batteries su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/505H01M4/525H01M10/052
CPCC01G45/02C01G45/1242C01G45/1257C01G53/04C01G53/42C01P2002/52C01P2002/54C01P2002/72C01P2002/85C01P2004/50C01P2004/82H01M4/362H01M4/364H01M4/366H01M4/505H01M4/525H01M10/052Y02E60/10C01G53/44C01G53/006H01M10/0525H01M2004/028
Inventor 崔文豪朴钟奂许京宰庾炫钟李京准朴正培崔胜铉
Owner ECOPRO BM CO LTD
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