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Cathode active material, method for preparing same, and lithium secondary battery comprising same

A cathode active material, secondary particle technology, applied in secondary batteries, lithium storage batteries, battery electrodes, etc., to improve high temperature increase rate characteristics, increase particle strength, and inhibit side reactions.

Pending Publication Date: 2022-05-27
POHANG IRON & STEEL CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditionally, in order to manufacture such a high-output battery, research to improve the performance of negative electrode active materials has been mainly conducted, but recently research has been active on improving the output characteristics of positive electrode active materials

Method used

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  • Cathode active material, method for preparing same, and lithium secondary battery comprising same
  • Cathode active material, method for preparing same, and lithium secondary battery comprising same
  • Cathode active material, method for preparing same, and lithium secondary battery comprising same

Examples

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preparation example Construction

[0055] Another embodiment of the present invention provides a method for preparing a positive electrode active material, comprising: a step of preparing a coating-forming substance; a step of adding an aqueous metal salt solution to a coprecipitation reactor to obtain a metal precursor; and The step of calcining the coating-forming substance, the metal precursor and the lithium raw material after mixing to obtain a positive electrode active material.

[0056] In particular, in this embodiment, the coating-forming substance may be provided in the form of a microparticulate powder. For example, the average particle diameter (D50) of the microparticulate powder may be 0.1 μm to 1.5 μm, and more specifically, 0.3 μm to 1 μm.

[0057] More specifically, the step of preparing the coating-forming substance includes a step of calcining after mixing raw materials constituting the boron compound, and a step of pulverizing the calcined calcined product. At this time, for example, the st...

preparation example 1

[0090] (Preparation Example 1) - Preparation of coating-forming substance and confirmation of properties

[0091] Weigh LiOH·H, the raw material of boron compound, in stoichiometric ratio 2 O and H 3 BO 3 Mixing was performed, followed by calcination at 600°C for 4 hours for synthesis.

[0092] figure 2 XRD results of the coating-forming substances prepared according to Preparation Example 1 are shown in . from figure 2 It is known that Li 3 BO 3 The phase is well formed as a crystal structure.

[0093] The coating-forming substance synthesized as above was pulverized into an average particle diameter of 0.5 μm to 0.7 μm by a bead mill to prepare a material having Li 3 BO 3 A coating of components forms a substance.

[0094] The coating-forming substances prepared as above were subjected to characteristic tests by the following methods.

[0095] After the synthesized coating-forming substance powder was formed into pellets having a diameter of 10 mm, heat treatmen...

Embodiment 1

[0098] (Example 1) Preparation containing 0.005 moles of Li 3 BO 3 The Ni is 71 mol% for the large particle size cathode active material

[0099] 1) Preparation of cathode active material precursors

[0100] NiSO is used as nickel raw material 4 ·6H 2 O, CoSO is used as cobalt raw material 4 ·7H 2 O, MnSO was used as manganese raw material 4 ·H 2 O. These raw materials were dissolved in distilled water to prepare a 2.5M aqueous metal salt solution.

[0101] After preparing the co-precipitation reactor, in order to prevent the oxidation of metal ions during the co-precipitation reaction, use N 2 Purging was carried out and the reactor temperature was maintained at 50°C.

[0102] A metal salt aqueous solution and NH as a chelating agent are added to the coprecipitation reactor 4 (OH). In addition, for pH adjustment, NaOH was used. The precipitate obtained according to the coprecipitation process was filtered, washed with distilled water, and dried in an oven at 100°...

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Abstract

The present embodiment relates to a positive electrode active material, a method for preparing the same, and a lithium secondary battery comprising the same. A positive electrode active material according to one embodiment is a lithium metal oxide particle in the form of a secondary particle including a primary particle, a coating layer of a boron-containing compound being located on at least a portion of a surface of the primary particle, the boron compound may include an amorphous structure.

Description

technical field [0001] The present invention relates to a positive electrode active material, a method for preparing the same, and a lithium secondary battery including the same. Background technique [0002] In recent years, with the explosive growth of demand for IT mobile devices and small electric drive devices (electric bicycles, small EVs, etc.) and the increase in demand for electric vehicles with a range of more than 400 km, worldwide efforts to develop high-capacity , The research and development of high energy density secondary battery. [0003] In the case of electric vehicles, the high output characteristics associated with rapid acceleration are particularly important. Conventionally, in order to manufacture such a high-output battery, research to improve the performance of the negative electrode active material has been mainly conducted, but recently, research to improve the output characteristics of the positive electrode active material has also been active....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48H01M10/0525
CPCH01M4/48H01M10/0525H01M4/525H01M4/62Y02E60/10C01P2002/02C01B35/121C01P2004/53C01P2004/61C01P2004/62C01P2004/84C01G53/006C01G53/50C01P2002/74C01P2002/60C01P2002/77H01M4/366H01M4/505H01M10/052C01G53/44C01P2004/80C01P2006/40C01P2004/03C01P2004/04C01P2006/10C01P2006/17
Inventor 南相哲崔权永
Owner POHANG IRON & STEEL CO LTD
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