Battery Electrode Slurry Composition for Stable Viscosity and Adhesion
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Solution Overview
Problem
The slurry containing carboxymethyl cellulose for electrode production in non-aqueous electrolyte secondary batteries often experiences reduced viscosity, leading to instability during application and decreased adhesiveness of the electrode mixture layer to the current collector.
Innovation Solution
Incorporating lithium carbonate within a specific range of 33 ppm to 300 ppm based on the total mass of the electrode mixture helps maintain the viscosity of the slurry and prevents bacterial enzyme activity, ensuring desirable adhesiveness between the electrode mixture layer and the current collector.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If carboxymethyl cellulose is used as a binder in the slurry, then the electrode mixture layer can be formed on the current collector, but the slurry viscosity decreases during production, leading to reduced stability and adhesiveness
Solution Approach 1:
Lithium carbonate acts as an intermediary substance that mediates between the carboxymethyl cellulose binder and the slurry system. It prevents bacterial enzyme activity that would otherwise degrade the binder, thereby maintaining slurry viscosity stability and ensuring proper adhesiveness without requiring additional stabilizing agents
Solution Approach 2:
The invention converts the potentially harmful effect of bacterial contamination into a beneficial outcome. By adding lithium carbonate to prevent bacterial enzyme activity, the slurry's viscosity is maintained, and the degradation of carboxymethyl cellulose is prevented, thus turning the threat of bacterial contamination into an opportunity to ensure slurry stability
2Stability of the object's composition
If lithium carbonate is added to prevent bacterial enzyme activity and maintain viscosity, then the slurry stability improves, but the composition complexity increases
Solution Approach 1:
Lithium carbonate serves multiple functions simultaneously: it acts as a bacteriostatic agent to prevent bacterial enzyme activity, maintains slurry viscosity stability, and contributes to the overall electrochemical performance of the battery. This multi-functionality reduces the need for additional separate additives, thereby minimizing composition complexity while achieving multiple objectives
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
The use of lithium carbonate within the specified range enhances the stability and adhesiveness of the electrode mixture layer, thereby improving the performance and cyclic characteristics of non-aqueous electrolyte secondary batteries.
Implementation Method 1
Incorporating lithium carbonate within a specific range of 33 ppm to 300 ppm based on the total mass of the electrode mixture helps maintain the viscosity of the slurry and prevents bacterial enzyme activity
Data Source
AI summary
The purpose of the present disclosure is to provide a slurry for a non-aqueous electrolyte secondary cell capable of obtaining an electrode mixture layer showing excellent adhesion with a current collector. The slurry for a non-aqueous electrolyte secondary cell, which is one mode of the present disclosure, contains: an electrode mixture containing an electrode active material, lithium carbonate, and carboxymethylcellulose or a salt thereof; and water. The lithium carbonate content is in the range of 33 to 300 ppm with respect to the total mass of the electrode mixture.