Electrochemical Layer Binder Composition for Redispersibility and Adhesion
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Solution Overview
Problem
Conventional binder compositions for electrochemical device functional layers suffer from poor redispersibility after long-term storage and inadequate adhesiveness, leading to issues in forming effective functional layers.
Innovation Solution
A binder composition comprising a particulate polymer with specific volume particle diameter D50 and true specific gravity, combined with a water-soluble polymer and water, enhances redispersibility and adhesiveness by ensuring good contact area and inhibiting aggregation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a particulate polymer is used in a binder composition for electrochemical device functional layers, then adhesiveness is improved, but redispersibility after long-term storage deteriorates due to sedimentation
Solution Approach 1:
The patent applies parameter changes by carefully controlling the volume-average particle diameter of the particulate polymer within a specific range (1.0-10.0 μm) and adjusting the pH of the binder composition to 5.0 or higher. These parameter modifications optimize both the adhesiveness and redispersibility of the composition after long-term storage, resolving the technical contradiction between these two properties.
Solution Approach 2:
The patent uses a composite material approach by combining the particulate polymer with specific additives including a polyacrylic acid polymer and a polyvinyl alcohol polymer. This composite formulation enhances both the adhesiveness and the redispersibility of the binder composition, allowing the system to overcome the sedimentation issue while maintaining strong adhesive properties.
2Strength
If the particulate polymer particle size is increased to improve adhesiveness, then contact area with battery members is enhanced, but sedimentation during storage increases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the volume-average particle diameter of the particulate polymer within the range of 1.0-10.0 μm. This optimized particle size range ensures sufficient contact area with battery members for good adhesiveness while minimizing sedimentation during long-term storage, thereby resolving the contradiction between adhesiveness and storage stability.
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 composition achieves excellent redispersibility after long-term storage and improves adhesiveness, resulting in improved functional layer performance and electrochemical device characteristics.
Implementation Method 1
a binder composition for an electrochemical device functional layer contains a particulate polymer, a water-soluble polymer, and water
Implementation Method 2
Since long-term storage of a binder composition for an electrochemical device functional layer containing a particulate polymer can result in sedimentation of the particulate polymer
Implementation Method 3
a binder composition for an electrochemical device functional layer contains a particulate polymer, a water-soluble polymer, and water
Data Source
AI summary
Provided is a binder composition for an electrochemical device functional layer that has excellent redispersibility after long-term storage and that can cause a functional layer to display excellent adhesiveness. The binder composition for an electrochemical device functional layer contains a particulate polymer, a water-soluble polymer, and water. The particulate polymer has a volume particle diameter D50 of not less than 1.0 µm and not more than 15.0 µm and a true specific gravity of not less than 1.00 and not more than 2.00.