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

A positive electrode active material, lithium secondary battery technology, applied in the direction of active material electrodes, battery electrodes, positive electrodes, etc., can solve the problems of particle surface damage, difficult to achieve capacity and life of lithium secondary batteries, uneven chemical structure, etc. Achieve the effect of improving the initial capacity and improving the battery efficiency characteristics

Pending Publication Date: 2022-06-07
SK ON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the lithium-transition metal composite oxide used as the active material for the positive electrode, when the chemical structure is uneven due to the precipitation of lithium, etc., it may be difficult to realize a lithium secondary battery with a desired capacity and life.
In addition, when the lithium-transition metal composite oxide structure is deformed and damaged during repeated charging and discharging, life stability and capacity retention characteristics may be reduced
[0008] For example, Korean Granted Patent Publication No. 10-0821523 discloses a method for removing lithium salt impurities by washing lithium-transition metal composite oxides with water, but there are limitations in sufficiently removing impurities, and there may be problems in the water washing process. cause particle surface damage

Method used

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

Examples

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preparation example Construction

[0098] figure 1 is a process flow diagram for illustrating a method of preparing a positive electrode active material of an exemplary embodiment.

[0099] Below, refer to figure 1 , a preparation method according to an exemplary embodiment of the above-described positive electrode active material for a lithium secondary battery is provided.

[0100] refer to figure 1 , preliminary lithium-transition metal composite oxide particles may be prepared (eg, step S10 ).

[0101] For example, by reacting a transition metal precursor with a lithium precursor, preliminary lithium-transition metal composite oxide particles can be prepared. The transition metal precursor (eg, Ni-Co-Mn precursor) can be prepared by a coprecipitation reaction.

[0102] For example, transition metal precursors can be prepared by coprecipitation of metal salts. The metal salts may include nickel salts, manganese salts and cobalt salts.

[0103] Examples of the nickel salt include nickel sulfate, nickel ...

Embodiment 1

[0152] Preparation of Preliminary Lithium-Transition Metal Composite Oxide Particles (S10)

[0153] use N 2Distilled water that was bubbled for 24 hours to remove internal dissolved oxygen was mixed with NiSO at a ratio of 0.885:0.090:0.025, respectively 4 , CoSO 4 , MnSO 4 . Add the above solution to the reactor at 50°C using NaOH and NH 3 H 2 O was used as a precipitant and a chelating agent, and a co-precipitation reaction was carried out for 48 hours, thereby obtaining Ni as a transition metal precursor 0.885 Co 0.09 Mn 0.025 (OH) 2 . The precursor obtained was dried at 80°C for 12 hours and then at 110°C for a further 12 hours.

[0154] Lithium hydroxide and the transition metal precursor were added to a dry high-speed mixer at a ratio of 1.01:1 and mixed uniformly for 5 minutes. The mixture was placed in a calciner, heated to 730-750°C at a ramp rate of 2°C / min, and held at 730-750°C for 10 hours. During the ramp-up and hold, oxygen was continuously passed ...

Embodiment 2

[0166] A positive electrode active material and a lithium secondary battery were obtained by the same method as in Example 1, except that 0.8% by weight of ammonium sulfate powder with respect to the total weight of the preliminary lithium-transition metal composite oxide particles was added to pure water.

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Abstract

A positive electrode active material for a lithium secondary battery according to an embodiment of the present invention includes lithium-transition metal composite oxide particles including a plurality of primary particles, and the lithium-transition metal composite oxide particles include lithium-sulfur-containing portions formed between the primary particles located at a surface portion. By preventing deformation of the layered structure of the primary particles and removing residual lithium, life characteristics and capacity characteristics can be improved.

Description

[0001] This application is a subsection of a Chinese patent application with an application date of October 26, 2021, a Chinese patent application number of 202111249762.1, and the title of the invention "positive electrode active material for lithium secondary battery and lithium secondary battery containing the same" filed, and this application claims the priority of the Korean application with application number KR10-2021-0052405. technical field [0002] The present invention relates to a positive electrode active material for lithium secondary batteries and a method for preparing the positive electrode active material. In more detail, it relates to a positive electrode active material for a lithium metal oxide-based lithium secondary battery and a method for preparing the positive electrode active material. Background technique [0003] Secondary batteries are batteries that can be repeatedly charged and discharged. With the development of the information communication ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1391H01M4/131H01M4/04H01M4/36H01M4/485H01M4/58
CPCH01M4/1391H01M4/131H01M4/362H01M4/485H01M4/5815H01M4/0471H01M2004/028H01M4/366H01M4/525C01P2006/80C01G53/42C01P2002/54C01G53/00Y02E60/10H01M4/364H01M4/505H01M4/60H01M10/0525
Inventor 金相墣申相慧朴相珉李泰景金明来尹祯培金直洙崔智勋
Owner SK ON CO LTD
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