CN-122000345-A - Method for manufacturing dry electrode film, and dry electrode including the same

Abstract

The present disclosure includes a method for manufacturing a dry electrode film, and a dry electrode including the same. The method for manufacturing a dry electrode film includes preparing a dry mixture by dry mixing an active material, a conductive material, and a binder, manufacturing a mixture mass by kneading the dry mixture, obtaining an electrode powder by pulverizing the mixture mass, manufacturing a sample using the electrode powder by a mold, testing yield strength of the sample, and manufacturing a sheet-type dry electrode film having a given thickness by rolling the electrode powder when a test result of the yield strength satisfies a predetermined standard.

Inventors

• Jin Xiangmi
• Jin Gangmin
• LI JIAYAN
• LI ZHENXIAN
• YAN DONGXI

Assignees

• 三星SDI株式会社

Dates

Publication Date

20260508

Application Date

20251105

Priority Date

20241107

Claims (20)

1. 1. A method for manufacturing a dry electrode film, the method comprising: Preparing a dry mixture by dry mixing an active substance, a conductive material, and a binder; producing a mixture mass by kneading the dry mixture; Obtaining electrode powder by pulverizing the mixture mass; Manufacturing a sample using the electrode powder through a mold; Testing the yield strength of the test specimen, and When the test result of the yield strength satisfies a predetermined standard, a sheet-type dry electrode film having a given thickness is manufactured by rolling the electrode powder.
2. 2. The method of claim 1, wherein manufacturing the sample using the electrode powder through the mold comprises: filling the electrode powder in the mold, and Pressurizing the electrode powder filled in the mold.
3. 3. The method of claim 2, wherein filling the electrode powder in the mold comprises filling the electrode powder in the mold such that a weight of the electrode powder filled in the mold is in a range of about 1g to about 5 g.
4. 4. The method of claim 2, wherein pressurizing the electrode powder filled in the mold comprises pressurizing the electrode powder using a pressurizing member at a pressure in a range of about 10 MPa to about 100 MPa.
5. 5. The method of claim 1, wherein testing the yield strength of the test specimen comprises: Pressurizing the test specimen using a clamp until it is broken; Measuring the load applied to the specimen when the specimen is broken, and The yield strength of the test specimen is calculated based on the measured load.
6. 6. The method of claim 5, wherein calculating the yield strength of the specimen comprises calculating the yield strength of the specimen based on equation 1; Equation 1: 。
7. 7. the method of claim 6, further comprising, after calculating the yield strength of the test specimen: when the yield strength calculated by equation 1 is less than a given value, the electrode powder is pulverized.
8. 8. The method of claim 7, wherein the given value is equal to about 2.3 MPa.
9. 9. The method of claim 6, further comprising, after calculating the yield strength of the test specimen: measuring the internal friction angle of the electrode powder, and The tensile strength of the test specimen was calculated using the internal friction angle.
10. 10. The method of claim 9, wherein measuring the internal friction angle of the electrode powder comprises measuring the internal friction angle of the electrode powder using a powder flowability evaluation method.
11. 11. The method of claim 9, wherein calculating the tensile strength of the specimen comprises calculating the tensile strength of the specimen based on equation 2; equation 2: 。
12. 12. The method of claim 11, further comprising pulverizing the electrode powder when the tensile strength calculated by equation 2 is less than a given value after calculating the tensile strength of the test specimen.
13. 13. The method of claim 12, wherein the given value is equal to about 0.5 MPa.
14. 14. A dry electrode film comprising: an electrode powder comprising an active material, a conductive material and a binder, Wherein the electrode powder has a sheet shape manufactured by rolling and having a given thickness, and the yield strength of the electrode powder in a sheet shape state is in the range of about 2.3 MPa or more.
15. 15. The dry electrode film of claim 14, wherein the electrode powder has an internal friction angle in the range of about 30 ° to about 50 °.
16. 16. The dry electrode film of claim 14, wherein the dry electrode film has a tensile strength in the range of about 0.5 MPa or greater.
17. 17. The dry electrode film of claim 14, wherein the dry electrode film has a porosity in the range of about 50% to about 70%.
18. 18. The dry electrode film of claim 14, wherein the active material comprises at least one of lithium nickel cobalt aluminum oxide (NCA), lithium iron phosphate (LFP), and graphite.
19. 19. The dry electrode film of claim 14, wherein the binder comprises at least one of Polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), and Polyacrylonitrile (PAN).
20. 20. A dry electrode comprising: A substrate, and A dry electrode film according to any one of claims 14 to 19 on at least one surface of the substrate.

Description

Method for manufacturing dry electrode film, and dry electrode including the same Technical Field Aspects of embodiments of the present disclosure relate to a method for manufacturing a dry electrode film (dry electrode film), a dry electrode film, and a dry electrode (dry electrode) including the dry electrode film. Background Unlike primary batteries that are not designed to be (re) charged, secondary (or rechargeable) batteries are typically designed to be discharged and recharged. Low-capacity secondary batteries are typically used in portable small-sized electronic devices such as smart phones, function phones, notebook computers, digital still cameras, and video cameras, while high-capacity secondary batteries are widely used as power sources for driving motors in hybrid vehicles and electric vehicles and for storing electric power (e.g., home and/or utility-scale electric power storage). The secondary battery generally includes an electrode assembly including a positive electrode and a negative electrode, a case accommodating the electrode assembly, and an electrode terminal connected to the electrode assembly. The dry electrode may include an electrode substrate, an active material, a binder, and a conductive material. The film-type dry electrode film may be formed by pressurizing an active material, a binder, and a conductive material. The dry electrode may be manufactured by bonding an electrode substrate and a dry electrode film through a lamination (lamination) process. The mechanical stability of the dry electrode film may be an advantageous factor, and thus various efforts may be made to predict mechanical properties in advance. The above information disclosed in this background section is for enhancement of understanding of the background of the disclosure and, therefore, may contain information that does not form a related (or prior) art. Disclosure of Invention Aspects of example embodiments of the present disclosure address at least the technical problems described above, and include a method for manufacturing a dry electrode film, and a dry electrode including the same. These and other aspects and features of the present disclosure are described in, or are apparent from, the following description of the exemplary embodiments of the present disclosure. To achieve the object, according to an example embodiment of the present disclosure, a method for manufacturing a dry electrode film includes preparing a dry mixture by dry mixing an active material, a conductive material, and a binder, manufacturing a mixture lump (lamp) by kneading the dry mixture, obtaining an electrode powder by pulverizing the mixture lump, manufacturing a sample using the electrode powder through a die, testing yield strength of the sample, and manufacturing a sheet-type dry electrode film having a given thickness by rolling the electrode powder when a test result of the yield strength meets a predetermined or desired (required) standard. According to an example embodiment, manufacturing a test specimen using electrode powder through a mold may include filling the electrode powder in the mold, and pressurizing the electrode powder filled in the mold. According to an example embodiment, filling the electrode powder in the mold may include filling the electrode powder in the mold such that a weight of the electrode powder filled in the mold is in a range of about 1 g to about 5 g. According to an example embodiment, pressurizing the electrode powder filled in the mold may include pressurizing the electrode powder using a pressurizing member at a pressure in a range of about 10 MPa to about 100 MPa. According to an example embodiment, testing the yield strength of the sample may include pressurizing the sample to be destroyed using a clamp, measuring a load applied to the sample at a time when the sample is destroyed, and calculating the yield strength of the sample based on the measured load. According to an example embodiment, calculating the yield strength of the sample may include calculating the yield strength of the sample based on equation 1 below. Equation 1: 。 According to an example embodiment, testing the yield strength of the sample may further include pulverizing the electrode powder when the yield strength calculated by equation 1 is less than a given value after calculating the yield strength of the sample. According to an example embodiment, the given value may be about 2.3 MPa. According to an example embodiment, testing the yield strength of the sample may further include measuring an internal friction angle of the electrode powder after calculating the yield strength of the sample, and calculating the tensile strength of the sample using the internal friction angle. According to example embodiments, measuring the internal friction angle of the electrode powder may include measuring the internal friction angle of the electrode powder using a powder flowability evaluation method. According to an example e