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Positive electrode active material and lithium secondary battery comprising same

A positive electrode active material and secondary particle technology, applied in secondary batteries, active material electrodes, positive electrodes, etc., can solve problems such as poor high temperature stability, battery rupture, and fire

Pending Publication Date: 2021-09-28
ECOPRO BM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, with LiCoO 2 Compared to LiNiO 2 The high-temperature stability of the battery is poor, and if an internal short circuit occurs due to external pressure, etc. in the charged state, the positive electrode active material will decompose by itself, or the battery will rupture due to a side reaction between the interface and surface of the electrolyte and the positive electrode active material. on fire

Method used

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  • Positive electrode active material and lithium secondary battery comprising same
  • Positive electrode active material and lithium secondary battery comprising same
  • Positive electrode active material and lithium secondary battery comprising same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0143] In the NiCoAl(OH) prepared by co-precipitation reaction 2 (d(50) = 3.0 μm) and Li as a lithium compound 2 CO 3 After weighing and mixing with LiOH (Li / M ratio=1.05±0.05), the first heat treatment was carried out at 800°C for 12 hours, thereby preparing the 1.0 Ni 0.9 co 0.078 Al 0.022 o 2 composed of lithium-based composite oxides.

[0144] The lithium-based composite oxide prepared above was added to distilled water, and washed with water while maintaining the temperature. After the dehydration process, drying was performed at 150° C. in a vacuum atmosphere. Next, the dried lithium-based composite oxide was subjected to a second heat treatment at 700° C. for 12 hours to obtain a positive electrode active material.

Embodiment 2

[0146] The cathode active material was prepared in the same manner as in Example 1 except that the first heat treatment temperature was 850° C. in Example 1.

Embodiment 3

[0148] The cathode active material was prepared in the same manner as in Example 1 except that the first heat treatment temperature was 900° C. in Example 1.

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Abstract

The present invention relates to a positive electrode active material which has the structural stability of a lithium composite oxide constituting a positive electrode active material and a lithium secondary battery including the same. The lithium composite oxide constituting the positive electrode active material according to the present invention is able to reduce the surface area and grain boundary surface of secondary particles having a side reaction with an electrolyte solution, thereby improving high-temperature stability and reducing a gas caused by the positive electrode active material, and the structural stability of the lithium composite oxide may be improved using a cation-mixing layer covering the surface of a primary particle.

Description

technical field [0001] The present invention relates to a positive electrode active material that improves the structural stability of a lithium composite oxide constituting the positive electrode active material, and a lithium secondary battery including the same. Background technique [0002] Compared with other rechargeable battery systems, lithium secondary batteries have the advantages of high working voltage, light weight, miniaturization, no memory effect, low self-discharge rate, long cycle life, and high energy density. Therefore, they are widely used in mobile phones, Laptops, tablets and other mobile terminals. [0003] In addition, in recent years, from the perspective of environmental protection, electric vehicles have been rapidly developed under the propaganda of the government and automobile manufacturers, and lithium secondary batteries are considered to be ideal power sources for next-generation electric vehicles due to their excellent performance. [0004...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/525H01M10/0525
CPCH01M4/485H01M4/525H01M10/0525H01M2004/028C01G53/42C01P2004/51C01P2004/61C01P2004/45C01P2006/40C01P2002/54C01P2004/03C01P2004/04Y02E60/10H01M4/366H01M4/505H01M4/131H01M2004/021
Inventor 崔文豪庾炫钟朴正培
Owner ECOPRO BM CO LTD