Functional Layer Composition for Adhesion and Cycle Stability
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Solution Overview
Problem
Existing electrochemical devices face challenges in achieving improved adhesiveness, output characteristics, and cycle characteristics of functional layers.
Innovation Solution
A composition for an electrochemical device functional layer containing non-conductive heat-resistant particles and a particulate polymer with a specific particle diameter distribution (Dv/Dn of 1.00 to 1.10) is used to form a functional layer with enhanced adhesiveness and improved output and cycle characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a conventional functional layer composition is used, then the basic function is provided, but the adhesiveness is insufficient
Solution Approach 1:
The patent applies parameter changes by precisely controlling the particle diameter distribution of the particulate polymer (Dv/Dn ratio between 1.05 and 1.20) and the glass transition temperature (50-90°C). These parameter optimizations enable the functional layer to achieve both high adhesiveness and excellent cycle characteristics, resolving the contradiction between strength and reliability.
Solution Approach 2:
The patent uses composite materials by combining particulate polymer particles with specific properties (aromatic vinyl monomer units, cross-linkable monomer units) with non-conductive heat-resistant particles. This composite structure provides both the adhesiveness needed for strong bonding and the thermal stability required for reliable cycle performance.
2Strength
If a functional layer with high adhesiveness is formed, then bonding strength is improved, but output characteristics may be compromised
Solution Approach 1:
The patent resolves this contradiction through parameter changes by optimizing the particle diameter distribution (Dv/Dn = 1.05-1.20) and glass transition temperature (50-90°C) of the particulate polymer. This creates a balance where the functional layer maintains strong adhesiveness while preserving sufficient ion permeability for good output characteristics.
Solution Approach 2:
The patent applies local quality by creating a functional layer with heterogeneous particle distribution and specific structural characteristics in different regions. The particulate polymer provides adhesive functionality at the interface, while the overall porous structure maintains ion transport pathways, achieving both strength and power locally and globally.
3Manufacturing precision
If the particle diameter of the particulate polymer is reduced, then filling performance is improved, but handling difficulty increases
Solution Approach 1:
The patent applies parameter changes by optimizing the particle diameter distribution to achieve a Dv/Dn ratio of 1.05-1.20. This controlled distribution provides sufficient fineness for good filling performance while maintaining particle size large enough to avoid excessive handling difficulty, resolving the contradiction between manufacturing precision and ease of operation.
Data Source
AI summary
A composition for an electrochemical device functional layer contains non-conductive heat-resistant particles and a particulate polymer having a particle diameter distribution value (Dv/Dn) of not less than 1.00 and less than 1.10.