System and method for evaluating dissolution quality of binder solution for secondary battery electrode, and method of manufacturing electrode slurry for secondary battery

Patent metadata

Field	Value
Publication number	US-12360029-B2
Application number	US-202217922334-A
Country	US
Kind code	B2
Filing date	Mar 21, 2022
Priority date	Mar 30, 2021
Publication date	Jul 15, 2025
Grant date	Jul 15, 2025

Abstract

According to a system and method for evaluating the dissolution quality of a binder solution for a secondary battery electrode, by preparing an electrode slurry with a binder solution having a predetermined amount or more of cumulative filtration amount or a predetermined level or less of flow rate reduction rate, the quality of an electrode for a secondary battery may be improved.

First claim

The invention claimed is:

1. A system for evaluating dissolution quality of a binder solution for a secondary battery electrode, comprising:
a pressure vessel accommodating the binder solution;
a pressure medium source supplying a pressure medium at a predetermined pressure to the pressure vessel;
a filter connected with the pressure vessel by a pipe; and
a flow rate measurement part that measures at least one of a) or b) with respect to the binder solution passing through the filter when the binder solution in the pressure vessel is transferred to the filter by the pressure medium supplied to the pressure vessel and filtered:
a) a cumulative filtration amount of the binder solution for a first period of time; and
b) a flow rate reduction rate of the binder solution after a second period of time with respect to an initial flow rate.

2. The system of claim 1 , wherein the pipe extends into the pressure vessel and an end of the pipe is installed adjacent to a bottom of the pressure vessel.

3. The system of claim 1 , wherein the filter is an in-line filter installed in series with the pipe.

4. The system of claim 3 , wherein the in-line filter comprises a filter member, an elastic member that pressurizes the filter member, and a housing accommodating the filter member and the elastic member.

5. A method for evaluating dissolution quality of a binder solution for a secondary battery electrode, comprising:
inputting a predetermined amount of the binder solution to a pressure vessel;
transferring the binder solution to a filter by supplying a pressure medium at a predetermined pressure to the pressure vessel;
filtering the binder solution through the filter; and
measuring at least one of a) or b) with respect to the binder solution passing through the filter:
a) a cumulative filtration amount of the binder solution for a first period of time; and
b) a flow rate reduction rate of the binder solution after a second period of time with respect to an initial flow rate.

6. The method of claim 5 , wherein the binder solution is stored in and transferred from the pressure vessel in a system sealed from outside until before the measurement of a) the cumulative filtration amount or b) the flow rate reduction rate.

7. The method of claim 6 , wherein the binder solution is transferred to the filter along a pipe extending into the pressure vessel and having one end installed adjacent to a bottom of the pressure vessel.

8. The method of claim 7 , wherein the binder solution is filtered through an in-line filter installed in series with the pipe.

9. The method of claim 5 , wherein a binder, which is a solute of the binder solution, includes one or more selected from the group consisting of polyvinylidene fluoride-co-hexafluoropropylene (PVDF-co-HFP), polyvinylidene fluoride (PVDF), polyacrylonitrile, polymethyl methacrylate, polyvinyl alcohol, carboxyl methyl cellulose (CMC), starch, hydroxypropyl cellulose, hydroxyethyl cellulose, regenerated cellulose, polyvinylpyrrolidone, tetrafluoroethylene, polyethylene, polypropylene, polyacrylic acid, ethylene-propylene-diene monomer (EPDM), sulfonated EPDM, polytetrafluoroethylene (PTFE), acrylonitrile-butadiene rubber, styrene-butadiene rubber (SBR), and acrylic rubber.

10. The method of claim 5 , wherein a solvent of the binder solution includes one or more organic solvents selected from N-methyl pyrrolidone (NMP), dimethyl formamide (DMF), acetone and dimethyl acetamide, or water.

11. The method of claim 5 , wherein the binder solution includes a carboxyl methyl cellulose (CMC) solution in which a predetermined content of the carboxyl methyl cellulose (CMC) is dissolved in water.

12. The method of claim 5 , wherein the binder solution includes a polyvinylidene fluoride (PVDF) solution in which a predetermined content of the polyvinylidene fluoride (PVDF) is dissolved in N-methyl pyrrolidone (NMP).

13. The method of claim 5 , wherein the cumulative filtration amount for a first period of time is a cumulative filtration amount of the binder solution for 10 minutes after filtering.

14. The method of claim 5 , wherein the flow rate reduction rate after a second period of time with respect to the initial flow rate is a flow rate reduction rate of the binder solution after 2 hours with respect to the initial flow rate.

15. A method of manufacturing an electrode slurry for a secondary battery, comprising:
preparing a binder solution satisfying at least one of a1) or b1) according to the method for evaluating the dissolution quality of the binder solution for the secondary battery electrode of claim 5 ; and
manufacturing the electrode slurry by mixing an electrode active material and a conductive material with the binder solution:
a1) a predetermined amount or more of the cumulative filtration amount for the first period of time; and
b1) a predetermined value or less of the flow rate reduction rate after the second period of time with respect to the initial flow rate.

16. The method of claim 5 , comprising measuring only the cumulative filtration amount.

17. The method of claim 5 , comprising measuring only the flow rate reduction rate.

18. The method of claim 5 , comprising measuring both the cumulative filtration amount and the flow rate reduction rate.

19. The method of claim 5 , wherein the first period of time is 10 minutes, 20 minutes, or 30 minutes.

20. The method of claim 7 , wherein at least a part of the pipe is immersed in the binder solution.

Assignees

• Lg Energy Solution Ltd

Inventors

• Kim Young Seok
• Park Joo Yong
• Yoon Sung Soo
• Lee Je Gwon
• Sim Hye Jin
• Kang Hyeon Jeong

Classifications

• H01M4/623

  fluorinated polymers · CPC title

• H01M4/0416

  involving impregnation with a solution, dispersion, paste or dry powder (H01M4/0438 takes precedence) · CPC title

• G01N2013/006

  Dissolution of tablets or the like · CPC title

• G01N11/04

  through a restricted passage, e.g. tube, aperture · CPC title

• H01M4/0404

  by coating on electrode collectors · CPC title