KR-20260063400-A - POSITIVE ELECTRODE ACTIVE MATERIAL PRECURSOR, POSITIVE ELECTRODE ACTIVE MATERIAL, AND POSITIVE ELECTRODE AND LITHIUM SECONDARY BATTERY COMPRISING THE SAME

Abstract

The present invention relates to a positive electrode active material precursor capable of realizing a positive electrode active material capable of improving the energy density of a battery, a positive electrode active material, a positive electrode including the same, and a lithium secondary battery. Specifically, the present invention relates to a positive electrode active material precursor comprising a composite transition metal hydroxide, wherein the composite transition metal hydroxide comprises nickel and one or more transition metals selected from the group consisting of cobalt, manganese, and aluminum, and wherein the unit density value according to Formula 1 described in this specification is 0.69 or higher and 1.05 or lower. In addition, the invention relates to a positive electrode active material comprising a lithium composite transition metal oxide in a single-particle form, wherein the single-particle form consists of one primary particle or is in a form in which two to ten primary particles are aggregated, and wherein the lithium composite transition metal oxide comprises nickel and one or more transition metals selected from the group consisting of cobalt, manganese, and aluminum, wherein the primary particle has a D A,50 of 1.80 μm to 2.60 μm and a span ((D v,90 - D v,10 )/D v,50 ) value of 0.80 to 1.00, and the positive electrode active material has a D 50 of 3.20 μm to 4.50 μm and a pellet density of 2.800 g/ cm³ or more, a positive electrode containing the same, and a lithium secondary battery.

Inventors

• 김선철
• 장재연
• 유민규
• 한송이
• 허운선
• 신혜원
• 임승우
• 강혁
• 선다은
• 강하은

Assignees

• 주식회사 엘지화학

Dates

Publication Date

20260507

Application Date

20241030

Claims (12)

1. As a positive active material precursor comprising a complex transition metal hydroxide, The above-mentioned composite transition metal hydroxide comprises nickel and one or more transition metals selected from the group consisting of cobalt, manganese, and aluminum. A positive active material precursor having a unit density value of 0.69 or higher and 1.05 or lower according to Formula 1 below: [Equation 1] Unit density = .
2. In claim 1, A positive active material precursor having a tap density of 1.50 g/ cm³ or more and 2.20 g/cm³ or less .
3. In claim 1, The above D 50 is a positive active material precursor having a thickness of 3.20㎛ or more and 4.50㎛ or less.
4. In claim 1, The above-mentioned BET specific surface area is 6.00 m² /g or more and 18.00 m² /g or less, a positive active material precursor.
5. In claim 1, The above-mentioned complex transition metal hydroxide is a positive electrode active material precursor having a nickel content of 60 mol% or more.
6. In claim 1, The above complex transition metal hydroxide is a positive active material precursor having a composition represented by the following chemical formula 1: [Chemical Formula 1] Ni a1 Co b1 M 1 c1 M 2 d1 (OH) 2 In the above chemical formula 1, M 1 is Mn, Al, or a combination thereof, and M2 is one or more selected from the group consisting of Zr, Y, W, Cu, Sr, Mn, Ti, Mg, Mo, B, Sn, Fe, Zn, Si, and Al, and 0.6≤a1<1, 0<b1<0.4, 0<c1<0.4, 0≤d1<0.1.
7. As a positive electrode active material comprising a lithium complex transition metal oxide in the form of a single particle, The above single particle form consists of one primary particle or is a form in which 2 to 10 primary particles are aggregated, and The above lithium composite transition metal oxide comprises nickel and one or more transition metals selected from the group consisting of cobalt, manganese, and aluminum. The above primary particle has a D A,50 of 1.80㎛ to 2.60㎛ and a span ((D v,90 - D v,10 )/D v,50 ) value of 0.80 to 1.00, and The positive active material has a D 50 of 3.20㎛ to 4.50㎛ and a pellet density of 2.800g/ cm³ or more.
8. In claim 7, The above lithium composite transition metal oxide is a positive electrode active material having a nickel content of 60 mol% or more.
9. In claim 7, The above lithium composite transition metal oxide is a positive active material having a composition represented by the following chemical formula 2: [Chemical Formula 2] Li 1+x Ni a2 Co b2 M 3 c2 M 4 d2 O 2-y A y In the above chemical formula 2, M3 is Mn, Al, or a combination thereof, and M 4 is one or more selected from the group consisting of Zr, Y, W, Cu, Sr, Mn, Ti, Mg, Mo, B, Sn, Fe, Zn, Si, and Al, and A is one or more selected from F, Cl, Br, I, and S, and -0.1≤x≤0.1, 0.6≤a2<1, 0<b2<0.4, 0<c2<0.4, 0≤d2<0.1, 0≤y≤0.2.
10. In claim 7, The above positive active material further comprises a coating layer formed on the lithium composite transition metal oxide, and The above coating layer is a positive active material comprising Al, W, or a combination thereof.
11. A positive electrode comprising a positive electrode active material according to any one of claims 7 to 10.
12. Anode according to claim 11; cathode; A separator interposed between the anode and the cathode; and A lithium secondary battery containing an electrolyte.

Description

Positive electric element active material precursor, positive electric element active material, positive electric element and lithium secondary battery comprising the same The present invention relates to a positive electrode active material precursor, a positive electrode active material, a positive electrode containing the same, and a lithium secondary battery. Specifically, it relates to a positive electrode active material precursor for a lithium secondary battery, a positive electrode active material, a positive electrode containing the same, and a lithium secondary battery. With the recent increase in technological development and demand for mobile devices and electric vehicles, the demand for rechargeable batteries as an energy source is rapidly rising. Among these rechargeable batteries, lithium-ion batteries, which possess high energy density and voltage, long cycle life, and low self-discharge rate, have been commercialized and are widely used. Lithium transition metal oxides such as lithium cobalt oxide like LiCoO2 , lithium nickel oxide like LiNiO2 , lithium manganese oxide like LiMnO2 or LiMn2O4 , and lithium iron phosphate compounds like LiFePO4 have been developed as positive electrode active materials for lithium secondary batteries, and recently, lithium composite transition metal oxides containing two or more transition metals such as Li[Ni a Co b Mn c ] O2 , Li[Ni a Co b Al c ] O2 , and Li[Ni a Co b Mn c Al d ]O2 have been developed and are widely used. Lithium composite transition metal oxides containing two or more transition metals developed to date are typically manufactured in the form of spherical secondary particles formed by the aggregation of tens to hundreds of primary particles. Recently, however, the development of single-particle cathode active materials is accelerating in order to address structural and thermal stability issues inherent to the secondary particle form of cathode active materials. Specifically, when secondary particle cathode active materials are applied to lithium secondary batteries, they generate a large amount of gas, which causes the battery volume to expand. Additionally, increasing the nickel content in the cathode active material to achieve high capacity increases the risk of fire. Consequently, there is a growing demand for the development of single-particle cathode active materials with excellent stability. Meanwhile, manufacturing single-particle cathode active materials requires heat treatment at high temperatures; however, high temperatures make it difficult to control particle shape and surface properties, and pose a challenge in achieving a certain level of pellet density. Consequently, various studies are currently underway to achieve a consistent pellet density. Figure 1 is an SEM image of the positive electrode active material of Example 4. Figure 2 is a diagram showing the boundaries of primary particles divided into random colors, obtained by image processing of the SEM image of the positive electrode active material of Example 4. Hereinafter, the present invention will be described in more detail to aid in understanding the invention. Terms and words used in this specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings, but should be interpreted in a meaning and concept consistent with the technical spirit of the invention, based on the principle that the inventor can appropriately define the concept of the terms to best describe his invention. In this specification, terms such as 'comprising,' 'having,' or 'having' are intended to specify the existence of the implemented features, numbers, steps, components, or combinations thereof, and should be understood as not excluding in advance the existence or addition of one or more other features, numbers, steps, components, or combinations thereof. In this specification, the term "on" means not only cases where one configuration is formed on the immediate upper surface of another configuration, but also cases where a third configuration is interposed between these configurations. In this specification, the term 'single particle form' refers to a form composed of 10 or fewer primary particles, as opposed to a spherical secondary particle form formed by the aggregation of tens to hundreds of primary particles manufactured by conventional methods. Specifically, in the present invention, the single particle form may be a single particle composed of one primary particle, or a secondary particle form formed by the aggregation of 2 to 10 primary particles. 'Primary particles' refer to the smallest unit of particles recognized when observing the positive electrode active material through a scanning electron microscope, and 'secondary particles' refer to a secondary structure formed by the aggregation of multiple primary particles. In this specification, 'tap density' is a value calculated by placing 50g of a positive electrode active material precurso