Aqueous Binder Composition for Battery Electrode Coatability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing binder solutions for power storage devices face challenges in achieving favorable coatability and dispersion stability, which affect the performance and longevity of electrodes and separators.
Innovation Solution
A binder aqueous solution for power storage devices is formulated with a water-soluble polymer comprising more than 99% of a (meth)acrylamide group-containing compound and 0.1% to 1% of an unsaturated hydrocarbon sulfonic acid or its salt, with a weight average molecular weight below 300,000, enhancing coatability and dispersion stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a binder aqueous solution is used for power storage devices, then adhesion and structural integrity are improved, but coatability and dispersion stability deteriorate
Solution Approach 1:
The patent changes the chemical parameters of the binder by specifying a water-soluble polymer with particular composition (99-99.9% (meth)acrylamide units, 0.1-1% unsaturated hydrocarbon sulfonic acid units) and molecular weight (less than 300,000). This parameter optimization resolves the contradiction by achieving both strong adhesion and good coatability simultaneously
Solution Approach 2:
The patent creates a composite binder system combining (meth)acrylamide groups for adhesion with unsaturated hydrocarbon sulfonic acid groups for water solubility and dispersion. This composite molecular structure enables the binder to exhibit both strong binding properties and excellent coating/dispersion characteristics
2Strength
If a binder aqueous solution is used for power storage devices, then adhesion and structural integrity are improved, but dispersion stability deteriorates
Solution Approach 1:
The patent optimizes the molecular weight parameter (less than 300,000) and compositional parameters (specific ratios of (meth)acrylamide and unsaturated hydrocarbon sulfonic acid units) to achieve a balance where the binder maintains strong adhesion while exhibiting superior dispersion stability in aqueous solution
Solution Approach 2:
The dual-functional molecular structure combining (meth)acrylamide adhesive groups with unsaturated hydrocarbon sulfonic acid hydrophilic groups creates a composite material that simultaneously provides strong adhesion and excellent dispersion stability through its amphiphilic character
Data Source
AI summary
A binder aqueous solution for power storage device, a slurry for power storage device, an electrode for power storage device, a separator for power storage device, a separator/electrode laminate for power storage device and a power storage device are provided. The present disclosure provides a binder aqueous solution for power storage device, in which the binder aqueous solution for power storage device contains a water-soluble polymer, the water-soluble polymer contains more than 99 mass % and less than 99.9 mass % of a structural unit derived from a (meth)acrylamide group-containing compound and more than 0.1 mass % and less than 1 mass % of a structural unit derived from an unsaturated hydrocarbon sulfonic acid and/or a salt thereof, and a weight average molecular weight of the water-soluble polymer is less than 300,000.