Composition for electrochemical device functional layer, functional layer for electrochemical device, laminate for electrochemical device, and electrochemical device
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Solution Overview
Problem
Conventional electrochemical device functional layers suffer from inadequate wet adhesiveness and insufficient inhibition of metal deposition on electrodes during charging and discharging, leading to potential short-circuiting issues.
Innovation Solution
A composition for an electrochemical device functional layer containing a particulate polymer with specific monomer units and a volume-average particle diameter within a certain range, along with optional heat-resistant particles, is used to form a functional layer with enhanced adhesiveness and metal deposition inhibition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional functional layer composition is used, then the manufacturing process is simple, but the wet adhesiveness is insufficient and metal deposition inhibition is poor
Solution Approach 1:
The patent employs composite materials by combining particulate polymer particles with specific monomer units (cycloalkyl group-containing, carboxyl group-containing, and hydroxyl group-containing monomers) in defined proportion ranges. This composite composition achieves both excellent wet adhesiveness and metal deposition inhibition while maintaining manufacturing simplicity, resolving the contradiction between performance improvement and complexity increase.
Solution Approach 2:
The patent applies parameter changes by specifying precise compositional parameters: the particulate polymer contains cycloalkyl group-containing monomer units (5-50 mass%), carboxyl group-containing monomer units (5-50 mass%), and hydroxyl group-containing monomer units (5-50 mass%). By optimizing these chemical composition parameters, the functional layer achieves superior wet adhesiveness and metal deposition inhibition without complicating the manufacturing process.
2Reliability
If the functional layer composition is optimized for better performance, then wet adhesiveness and metal deposition inhibition improve, but the composition becomes more complex
Solution Approach 1:
The patent resolves this contradiction by defining specific parameter ranges for the particulate polymer composition: cycloalkyl group-containing monomer units (5-50 mass%), carboxyl group-containing monomer units (5-50 mass%), and hydroxyl group-containing monomer units (5-50 mass%). These optimized parameters achieve excellent wet adhesiveness and metal deposition inhibition while keeping the composition manageable through clear quantitative specifications.
Solution Approach 2:
The patent uses composite materials strategy by integrating multiple functional monomer units within the particulate polymer structure. The synergistic combination of cycloalkyl groups (for structural integrity), carboxyl groups (for adhesion), and hydroxyl groups (for metal deposition inhibition) achieves superior performance without requiring separate layers or complex multi-component systems.
3Reliability
If conventional functional layers are used, then the device structure is simple, but short-circuiting between electrodes cannot be sufficiently inhibited
Solution Approach 1:
The patent employs composite materials by incorporating multiple functional monomer units (cycloalkyl, carboxyl, and hydroxyl groups) within a single functional layer structure. This multi-functional composite approach provides excellent short-circuit prevention through combined mechanisms of adhesion enhancement and metal deposition inhibition, avoiding the need for multiple separate functional layers.
Solution Approach 2:
The patent applies universality by designing the particulate polymer to perform multiple functions simultaneously: providing structural integrity through cycloalkyl groups, enhancing wet adhesiveness through carboxyl groups, and inhibiting metal deposition through hydroxyl groups. This multi-functional single-layer design achieves superior short-circuit prevention without increasing device structural complexity.
Data Source
AI summary
Provided is a composition for an electrochemical device functional layer with which it is possible to form a functional layer that has excellent wet adhesiveness and that is capable of good inhibition of metal deposition on an electrode during charging and discharging. The composition for an electrochemical device functional layer contains a particulate polymer. The particulate polymer includes a cycloalkyl group-containing monomer unit and at least one monomer unit (A) selected from the group consisting of a glycidyl group-containing monomer unit, an acetyl group-containing monomer unit, and an amide group-containing monomer unit. The particulate polymer has a volume-average particle diameter of not less than 1.0 μm and not more than 10.0 μm.