KR-20260066494-A - APPARATUS FOR TESTING PROPERTIES OF ELECTRODE SLURRY AND METHOD FOR MANUFACTURING A SECONDARY BATTERY USING THE SAME

Abstract

According to exemplary embodiments, a method for manufacturing a secondary battery is provided. The method may include the steps of: obtaining a storage modulus of an electrode slurry; and determining the adhesion of the electrode slurry to a current collector based on the storage modulus.

Inventors

• 안진수
• 김지은
• 김민승
• 김광현
• 윤자현

Assignees

• 주식회사 엘지에너지솔루션

Dates

Publication Date

20260512

Application Date

20241104

Claims (13)

1. Step of obtaining the storage modulus of the electrode slurry; and A method for manufacturing a secondary battery, comprising the step of determining the adhesion force of the electrode slurry to the current collector based on the storage modulus.
2. In paragraph 1, After the step of determining the adhesion strength of the electrode slurry, A method for manufacturing a secondary battery, further comprising the step of measuring the adhesion of the electrode slurry to the current collector.
3. In paragraph 2, A method for manufacturing a secondary battery, further comprising the step of comparing a determined value of the adhesion strength of the electrode slurry with a measured value of the adhesion strength of the electrode slurry.
4. In paragraph 2, The step of measuring the adhesion strength of the electrode slurry is, A method for manufacturing a secondary battery, comprising applying and drying the electrode slurry onto the current collector to form an active material layer, and measuring the peel strength of the active material layer.
5. In paragraph 4, A method for manufacturing a secondary battery, characterized in that the peel strength of the active material layer is measured by performing a 90-degree peel test.
6. In paragraph 1, A method for manufacturing a secondary battery, characterized in that the step of determining the adhesion strength of the electrode slurry is based on a positive correlation between the storage modulus and the adhesion strength.
7. In paragraph 1, A method for manufacturing a secondary battery, characterized in that the step of determining the adhesion strength of the electrode slurry is based on a lookup table of the storage modulus and the adhesion strength.
8. In paragraph 1, A method for manufacturing a secondary battery, characterized in that, in the step of obtaining a storage modulus of the electrode slurry, the storage modulus is measured using a rheometer under periodic stress conditions of a temperature in the range of 5°C to 40°C, a strain in the range of 0.1% to 1%, and a frequency in the range of 0.01 Hz to 10 Hz.
9. In paragraph 8, A method for manufacturing a secondary battery, characterized in that the above periodic stress is applied in a logarithmic frequency sweeping manner.
10. A rheometer configured to measure the storage modulus of an electrode slurry; and A device for measuring the physical properties of an electrode slurry, comprising an analyzer configured to determine the adhesion force of the electrode slurry to a current collector based on the storage modulus.
11. In Paragraph 10, An apparatus for measuring the physical properties of an electrode slurry, characterized in that the rheometer is configured to measure the storage modulus under periodic stress conditions of a temperature in the range of 5 ℃ to 40 ℃, a strain in the range of 0.1% to 1%, and a frequency in the range of 0.01 Hz to 10 Hz.
12. In Paragraph 11, An apparatus for measuring the physical properties of an electrode slurry, characterized in that the analyzer is configured to determine the adhesion force from the storage modulus based on a positive correlation between the storage modulus and the adhesion force.
13. In Paragraph 11, An apparatus for measuring the physical properties of an electrode slurry, characterized in that the analyzer is configured to determine the adhesion force from the storage modulus based on a lookup table of the storage modulus and the adhesion force.

Description

Apparatus for testing properties of electrode slurry and method for manufacturing a secondary battery using the same The present invention relates to a device for measuring the physical properties of an electrode slurry and a method for manufacturing a secondary battery using the same. Unlike primary batteries, secondary batteries can be charged and discharged multiple times. Secondary batteries are widely used as energy sources for various wireless devices such as handsets, laptops, and cordless vacuum cleaners. Recently, as the manufacturing cost per unit capacity of secondary batteries has decreased dramatically due to improved energy density and economies of scale, and as the driving range of BEVs (battery electric vehicles) has increased to a level equivalent to that of fuel vehicles, the primary use of secondary batteries is shifting from mobile devices to mobility. Secondary batteries are manufactured through electrode, assembly, and activation processes. Among these, the electrode process is the most critical process for determining the yield and performance of the battery cell. The electrode process may include a coating process, a roll press process, and a slitting process. In the coating process, active materials and insulating materials may be applied to the surface of the current collector. To perform the coating process, an electrode slurry may be prepared. The electrode slurry may be provided through a mixing process. FIG. 1 is a flowchart illustrating a method for manufacturing a secondary battery according to exemplary embodiments. FIG. 2 is a drawing showing an inspection device according to exemplary embodiments. FIG. 3 is a graph showing the storage modulus of electrode slurry samples according to exemplary embodiments. FIG. 4 is a graph showing the adhesion of electrode slurry samples according to exemplary embodiments. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. Prior to this, terms and words used in this specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings. Instead, based on the principle that the inventor can appropriately define the concepts of terms to best describe his invention, they should be interpreted in a meaning and concept consistent with the technical spirit of the present invention. Therefore, the embodiments described in this specification and the configurations illustrated in the drawings are merely the most preferred embodiments of the present invention and do not represent all of the technical ideas of the present invention; thus, it should be understood that various equivalents and modifications that can replace them may exist at the time of filing this application. In addition, in describing the present invention, if it is determined that a detailed description of related known components or functions may obscure the essence of the invention, such detailed description is omitted. Since embodiments of the present invention are provided to more fully explain the invention to those skilled in the art, the shapes and sizes of the components in the drawings may be exaggerated, omitted, or schematically depicted for clearer explanation. Accordingly, the size or proportion of each component does not entirely reflect the actual size or proportion. (1st and 2nd embodiments) FIG. 1 is a flowchart illustrating a method for manufacturing a secondary battery according to exemplary embodiments. FIG. 2 is a drawing showing an inspection device (100) according to exemplary embodiments. FIG. 3 is a graph showing the storage modulus of electrode slurry samples according to exemplary embodiments. Figure 4 is a graph showing the adhesion of electrode slurry samples to a current collector according to exemplary embodiments. Referring to Figures 1 and 2, the storage modulus of the electrode slurry (SL) can be measured at P110. According to exemplary embodiments, the electrode slurry (SL) may comprise an electrode active material, a conductive material, a binder, and a solvent. The electrode slurry (SL) may be prepared by dissolving the electrode active material, the conductive material, and the binder, etc., in a solvent. The solvent may disperse components of the electrode slurry (SL), such as the electrode active material. The solvent may be an aqueous solvent or a non-aqueous solvent. The solvent may comprise any one of DMSO, isopropyl alcohol, NMP, acetone, water, and mixtures thereof. The electrode active material may be a positive electrode active material or a negative electrode active material. According to exemplary embodiments, the electrode active material may be a positive electrode active material. The positive electrode active material is a material capable of causing an electrochemical reaction. The positive electrode active material may be a lithium transition metal oxide. The positive electrode active material may be a layered comp