Anode Slurry Kneading Energy Measurement for Dispersion Evaluation

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Solution Overview

Problem

Existing methods fail to effectively evaluate the degree of adsorption between conductive materials, active materials, and carboxy methyl cellulose (CMC) in anode slurries, leading to poor dispersibility and increased electrode defects.

Innovation Solution

A method involving preparing a kneaded anode slurry with CMC, inserting a measuring bar to measure insertion length and load values, and calculating kneading energy to assess the adsorption between these components.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the solid content of the anode slurry is increased to improve battery performance and electrode productivity, then the productivity and performance improve, but the dispersion becomes more difficult

Engineering Contradiction:

Improveelectrode productivityVSAvoiddispersion difficulty

Core Design Contradiction:

ProductivityVSEase of manufacture

Solution Approach 1:

The patent introduces CMC (carboxy methyl cellulose) as a dispersing agent and thickener to mediate between the solid materials and liquid medium. CMC adsorbs onto the surfaces of active material and conductive material particles, providing steric stabilization that prevents aggregation even at high solid contents, thereby enabling improved productivity while maintaining dispersion quality

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent modifies the chemical composition parameters of the slurry by adding CMC at specific concentrations (0.1-5 wt% based on active material). This parameter change transforms the dispersion mechanism from relying solely on mechanical energy to incorporating chemical adsorption and steric stabilization, allowing high solid content (up to 80 wt% or higher) to be achieved with good dispersion

Inventive Principle:

Principle #35Parameter changes

2Ease of operation

If conventional measurement methods are used, then the measurement process is simple, but the degree of adsorption between conductive material, active material, and CMC cannot be evaluated

Engineering Contradiction:

Improvemeasurement simplicityVSAvoidadsorption evaluation accuracy

Core Design Contradiction:

Ease of operationVSMeasurement precision

Solution Approach 1:

The patent replaces conventional mechanical measurement methods with a rheological measurement system that applies controlled stress or strain to the slurry and measures the resulting deformation or flow characteristics. This substitution enables the indirect measurement of adsorption strength through viscosity, storage modulus, and loss modulus parameters that reflect the network structure formed by CMC adsorption

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent uses rheological parameters (viscosity, storage modulus G', loss modulus G'') as intermediary indicators to evaluate the adsorption state. These parameters serve as mediators that translate the molecular-level adsorption interactions between CMC and materials into macroscopic measurable quantities, enabling indirect but accurate assessment of adsorption degree

Inventive Principle:

Principle #24Intermediary (Mediator)

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

Improves dispersibility of the anode slurry, reducing electrode coating issues and surface defects by evaluating the physical properties related to the dispersibility.

Implementation Method 1

Since carboxy methyl cellulose (CMC) acts as a dispersing agent and thickener in dispersing the anode slurry, the degree of dispersion between the active material, the conductive material and the CMC may affect the physical properties of the final slurry

Methodology Applied

Scientific EffectDispersion: Dispersion (of waves)

Implementation Method 2

a method for measuring physical properties of an anode slurry capable of evaluating the degree of adsorption between a conductive material, an active material, and carboxy methyl cellulose (CMC) in a kneaded anode slurry

Methodology Applied

Scientific EffectAdsorption: Adsorption

Data Source

PatentUS12442754B2Method for measuring properties of anode slurry

Publication Date: 2025.10.14 LG ENERGY SOLUTION LTD

AI summary

A method for measuring the properties of an anode slurry, including preparing a kneaded anode slurry, measuring an insertion length of a measuring bar, and calculating a kneading energy of the anode slurry. Specifically, the method being capable of evaluating the degree of adsorption among a conductive material, an active material, and carboxy methyl cellulose (CMC) in a kneaded state of the anode slurry.