Electrochemical Functional Layer Composition for Stronger Adhesion
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Solution Overview
Problem
Conventional electrochemical device functional layers lack sufficient adhesiveness, both before and after immersion in electrolyte solution, which affects the performance and stability of electrochemical devices.
Innovation Solution
A composition for an electrochemical device functional layer is developed, comprising a particulate polymer (X) and a particulate polymer (Y) with different volume-average particle diameters, where one polymer includes a specific reactive monomer unit A and the other includes a specific reactive monomer unit B, such as epoxy or hydroxy group-containing units, to enhance adhesiveness through reactive bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a functional layer is formed using conventional particulate polymers, then the basic structure is achieved, but the adhesiveness is insufficient
Solution Approach 1:
The patent uses a composite material system consisting of two types of particulate polymers with different particle diameters and complementary reactive monomer units. The first particulate polymer contains reactive monomer unit A, while the second contains reactive monomer unit B, creating a composite system that achieves superior adhesiveness through synergistic interactions between the different polymer components
Solution Approach 2:
The patent applies local quality by assigning different functions to particulate polymers based on their particle diameter. Larger particulate polymers serve as adhesive particles for adhering constituent members, while smaller particulate polymers act as binders for binding components within the functional layer. This functional differentiation based on particle size optimizes the overall adhesiveness
2Strength
If larger particle diameter polymers are used for adhesion, then adhesive strength improves, but binding capability within the layer decreases
Solution Approach 1:
The patent segments the particulate polymer population into two distinct size categories with specific functional assignments. The first particulate polymer with larger particle diameter (Dv50: 0.5-5.0 μm) is optimized for adhesive strength at interfaces, while the second particulate polymer with smaller particle diameter (Dv50: 0.03-0.5 μm) is optimized for binding capability within the layer, allowing both functions to be performed simultaneously without compromise
3Reliability
If reactive monomer units are introduced to improve adhesiveness, then bonding strength increases, but manufacturing complexity increases
Solution Approach 1:
The patent controls the proportion of reactive monomer units within specific ranges (reactive monomer unit A: 1-30 mass%, reactive monomer unit B: 1-30 mass%) to achieve optimal adhesiveness while maintaining manufacturing feasibility. This parameter optimization ensures that the reactive groups provide sufficient bonding capability without excessive complexity in the polymerization process or material handling
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 forms a functional layer with improved adhesiveness, heat resistance, and ion conductivity, leading to enhanced electrochemical characteristics and output characteristics of the electrochemical device.
Implementation Method 1
one of the particulate polymer (X) and the particulate polymer (Y) includes a reactive monomer unit A and the other of the particulate polymer (X) and the particulate polymer (Y) includes a reactive monomer unit B
Data Source
AI summary
Provided is a composition for an electrochemical device functional layer that can form a functional layer having excellent adhesiveness. The composition for an electrochemical device functional layer contains a particulate polymer (X) and a particulate polymer (Y). A volume-average particle diameter of the particulate polymer (Y) is smaller than a volume-average particle diameter of the particulate polymer (X). One of the particulate polymer (X) and the particulate polymer (Y) includes a specific reactive monomer unit A and the other of the particulate polymer (X) and the particulate polymer (Y) includes a specific reactive monomer unit B.