Binder Solution Filtration Metrics for Battery Electrode Slurry Quality

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Solution Overview

Problem

Existing methods for evaluating the dissolution quality of binder solutions for secondary battery electrodes are inaccurate and lack reproducibility, leading to variations in electrode quality due to undissolved materials and external impurities, which affect the adhesive strength and viscosity of the electrode slurry.

Innovation Solution

A system and method that quantitatively evaluate the dissolution quality of binder solutions by measuring cumulative filtration amount and flow rate reduction rate using a pressure vessel, pressure medium, filter, and flow rate measurement part, ensuring the binder solution is filtered under controlled conditions to minimize external contamination.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If visual observation or mesh filter methods are used to evaluate dissolution quality, then the evaluation process is simple, but measurement precision and reproducibility are poor

Engineering Contradiction:

Improveevaluation process simplicityVSAvoiddissolution quality measurement accuracy

Core Design Contradiction:

Ease of operationVSMeasurement precision

Solution Approach 1:

The patent replaces manual visual observation and simple mesh filtration with an automated evaluation system that uses a circulation pump, filtration unit, and sensor to continuously measure flow rate changes. This mechanical/automated system substitutes human judgment and simple filtration, providing objective, quantitative data on dissolution quality through flow rate measurements, thereby improving measurement precision while maintaining operational simplicity.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Quantity of substance

If mesh filter filtration is used, then impurities can be counted, but filter-derived impurities and air bubbles interfere with measurement accuracy

Engineering Contradiction:

Improveimpurity counting capabilityVSAvoiddissolution quality evaluation accuracy

Core Design Contradiction:

Quantity of substanceVSMeasurement precision

Solution Approach 1:

The patent extracts and removes the problematic mesh filter from the evaluation system, replacing it with a filtration unit that uses a filter membrane. This extraction eliminates the source of filter-derived impurities and air bubble generation. The circulation-based system then continuously filters and measures the binder solution without the interference that plagues mesh filter methods, achieving accurate dissolution quality evaluation.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent introduces a circulation pump and filtration unit as intermediary components between the binder solution and the measurement system. These intermediaries facilitate continuous circulation and filtration while preventing direct contact with air that would create bubbles, and using a filter membrane instead of mesh that doesn't shed impurities. This intermediary system enables accurate measurement without the drawbacks of direct mesh filtration.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Ease of operation

If binder solution dissolution quality is not accurately evaluated, then the evaluation process remains simple, but electrode slurry quality and adhesive strength vary significantly

Engineering Contradiction:

Improveevaluation simplicityVSAvoidelectrode quality consistency

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent implements a feedback-based evaluation system where the flow rate measurement provides quantitative information about dissolution quality. The system continuously circulates the binder solution through the filtration unit and measures flow rate changes, using this feedback to objectively assess dissolution completeness. This feedback mechanism ensures reliable and consistent evaluation results that directly correlate with electrode slurry quality, eliminating the variability associated with simple visual methods.

Inventive Principle:

Principle #23Feedback

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This approach allows for the production of high-quality electrode slurries with improved adhesive strength and reduced viscosity, thereby enhancing the overall performance of secondary battery electrodes by accurately selecting binder solutions with optimal dissolution qualities.

Implementation Method 1

a pressure medium source (20) supplying a pressure medium at a predetermined pressure to the pressure vessel (10)

Methodology Applied

Scientific EffectPressure gradient: Pressure Gradient

Implementation Method 2

a filter (30) connected with the pressure vessel (10) by a pipe (12)

Methodology Applied

Scientific EffectPhysical filtration: Filter (physical)

Data Source

PatentUS12360029B2System and method for evaluating dissolution quality of binder solution for secondary battery electrode, and method of manufacturing electrode slurry for secondary battery

Publication Date: 2025.07.15 LG ENERGY SOLUTION LTD

AI summary

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.