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KR-20260062854-A - POSITIVE ELECTRODE SLURRY COMPOSITION, POSITIVE ELECTRODE AND LITHIUM SECONDARY BATTERY USING THE SAME

KR20260062854AKR 20260062854 AKR20260062854 AKR 20260062854AKR-20260062854-A

Abstract

The present invention provides an anode slurry composition comprising an anode active material comprising a lithium nickel-based oxide having a nickel content of 90 atm% or more among all metal components excluding lithium, wherein the anode active material is in the form of a single particle consisting of nodules or in the form of a pseudo-single particle formed by aggregating 30 or fewer nodules, and satisfies the following formula (1). Equation (1): 1,700≥(β×γ)/(α1×α2) In the above equation (1), α1 is the value of D min of the positive active material particles measured in μm, α2 is the value of D mean of the average particle size of the nodules of the positive active material measured in μm, β is the content of residual lithium byproducts contained in the positive active material measured in wt%, and γ is the viscosity of the positive slurry composition measured in cP at 25°C.

Inventors

  • 이윤주
  • 이창우
  • 한우리
  • 손순한
  • 박지영
  • 김홍재

Assignees

  • 주식회사 엘지에너지솔루션

Dates

Publication Date
20260507
Application Date
20251023
Priority Date
20241029

Claims (14)

  1. A positive electrode slurry composition comprising a positive electrode active material comprising a lithium nickel-based oxide having a nickel content of 90 atm% or more among all metal components excluding lithium, wherein The above-mentioned positive active material is in the form of a single particle consisting of one nodule, or in the form of a pseudo-single particle formed by the aggregation of 30 or fewer nodules, and Anode slurry composition satisfying the following formula (1): Equation (1): 1,700≥(β×γ)/(α1×α2) In the above equation (1), α1 is the value of D min of the positive active material particles measured in μm, α2 is the value of D mean of the average particle size of the nodules of the positive active material measured in μm, β is the content of residual lithium byproducts contained in the positive active material measured in wt%, and γ is the viscosity of the positive slurry composition measured in cP at 25°C.
  2. In claim 1, The above α1 is an anode slurry composition in which α1 is 1.3 to 1.5.
  3. In claim 1, The above α2 is an anode slurry composition in which α2 is 1.00 to 1.25.
  4. In claim 1, The above β is an anode slurry composition in which β is 0.3 to 0.5.
  5. In claim 1, The above γ is an anode slurry composition in which 2,000 to 10,000.
  6. In claim 1, A positive electrode slurry composition for a lithium secondary battery, wherein the positive electrode active material is a lithium nickel-based oxide represented by the following [Chemical Formula 2]. [Chemical Formula 2] Li a Ni b Co c M 1 d M 2 e O 2 In the above chemical formula 2, M1 is Mn, Al, or a combination thereof, and M2 is one or more selected from the group consisting of Al, Ba, Ca, Zr, Ti, Mg, Ta, Nb, W, Y, and Mo, and 0.8≤a≤1.2, 0.9≤b<1, 0<c<0.1, 0<d<0.1, 0≤e≤0.05.
  7. In claim 1, A positive electrode slurry composition having a BET specific surface area of 0.1 m² /g to 1.0 m² /g of the positive electrode active material.
  8. In claim 1, A positive electrode slurry composition in which the residual lithium byproduct included in the above positive electrode active material is Li₂CO₃ , LiOH , or a combination thereof.
  9. In claim 1, The above-mentioned positive active material is a positive slurry composition that does not include a surface coating layer.
  10. In claim 1, The above anode slurry composition is an anode slurry composition that does not contain an anode additive.
  11. An anode manufactured using the anode slurry composition of any one of claims 1 to 10.
  12. A lithium secondary battery comprising a positive electrode according to claim 11.
  13. In claim 12, The above lithium secondary battery is a cylindrical lithium secondary battery.
  14. In claim 13, The above-described cylindrical lithium secondary battery is a lithium secondary battery having a form factor ratio of 0.4 or higher.

Description

Positive ELECTRODE SLURRY COMPOSITION, POSITIVE ELECTRODE AND LITHIUM SECONDARY BATTERY USING THE SAME The present invention relates to an anode slurry composition, an anode manufactured using the same, and a lithium secondary battery. Recently, the development of bulky, large-sized lithium-ion batteries is underway to further increase the capacity of batteries for electric vehicles. For large-sized lithium-ion batteries, there is a demand for providing higher capacity and energy density. Accordingly, as the demand for high-output, high-capacity batteries, such as those for electric vehicles, has recently increased, active attempts are being made to increase the nickel content in lithium-nickel-based oxides. However, high-nickel lithium-nickel-based oxides have limitations in application as cathode materials because they generate a large amount of gas during high-temperature storage or charge-discharge processes due to significant lattice structural instability caused by cation mixing and oxygen desorption, as well as a high content of residual lithium impurities on the surface. To solve the above problems, a technology has been proposed to manufacture cathode active materials in the form of single particles or pseudo-single particles, rather than secondary particles, by increasing the calcination temperature during the manufacture of lithium nickel-based oxides. The cathode active materials in the form of single particles or pseudo-single particles have the advantage of having less adverse reactions with the electrolyte because the contact area with the electrolyte is smaller compared to conventional cathode active materials in the form of secondary particles, and less particle breakage during electrode manufacturing due to excellent particle strength. However, cathode active materials in the form of single particles or pseudo-single particles have a limitation in that their electrical conductivity is lower than that of active materials composed of secondary particles. Since cathode active materials in the form of single particles or pseudo-single particles are manufactured with a relatively small particle size (D 50 ) to ensure conductivity, there is increased contact with the binder and conductive material, and particularly in the presence of moisture, the aggregation between the active material, conductive material, and binder particles is severe, leading to a problem of gelation of the cathode slurry composition. Lithium secondary batteries containing a cathode manufactured using a cathode slurry composition with such problems exhibit inferior lifespan characteristics and have a problem of high resistance. The present invention will be described in more detail below. 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. The terms used in this specification are used merely to describe exemplary embodiments and are not intended to limit the invention. The singular expression includes the plural expression unless the context clearly indicates otherwise. In this specification, terms such as “comprising,” “comprising,” or “having” are intended to specify the existence of the implemented features, numbers, steps, components, or combinations thereof, and should not be understood as precluding the existence or addition of one or more other features, numbers, steps, components, or combinations thereof. In the present invention, "single particle" means a particle consisting of one single nodule, and "pseudo-single particle" means a particle that is a composite formed of 30 or fewer nodules. In the present invention, "nodule" refers to a particle unit body constituting a single particle and a pseudo-single particle, and the nodule may be a single particle lacking a crystalline grain boundary, or a polycrystalline material in which no grain boundary appears when observed at a field of view of 5,000 to 20,000 times using a scanning electron microscope (SEM). In the present invention, "secondary particle" refers to a particle formed by the aggregation of tens to hundreds of multiple primary particles. More specifically, the secondary particle is an aggregate of 40 or more primary particles. The expression “particle” used in the present invention may include any one or all of a single particle, a pseudo-single particle, a primary particle, a nodule, and a secondary particle. In the present invention, "D 50 ", "D min ", and "D max " refer to the particle size, minimum particle size, and maximum particle size corresponding to 50% of the volume cumulative particle size distribution of the corresponding particle powder, respectively, and can be measured using a laser diffraction method. For example, after dispers