Electrochemical Functional Layer Composition for Wet Adhesion
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Solution Overview
Problem
Conventional electrochemical device functional layers lack sufficient adhesiveness, particularly 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 containing two types of particulate polymers 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 layer can be created with basic structural properties, but the adhesiveness (both dry and wet) is insufficient
Solution Approach 1:
The patent applies composite materials by combining two distinct particulate polymer types with different particle diameters and complementary reactive monomer units. This composite approach enables the functional layer to achieve superior adhesiveness through synergistic interactions between the polymer components, resolving the contradiction between improved reliability and acceptable complexity.
Solution Approach 2:
The patent implements local quality by assigning specific functional roles to different particle size fractions within the composition. Larger particulate polymers provide structural framework and primary adhesion, while smaller particulate polymers fill interstices and enhance secondary bonding, creating localized functional zones that collectively improve overall adhesiveness.
2Strength
If larger particle diameter polymers are used for adhesion, then adhesive properties improve, but binder effectiveness decreases
Solution Approach 1:
The patent applies segmentation by dividing the polymer composition into two distinct particle size segments with specialized functions. Larger particulate polymers (first size range) serve primarily as adhesive agents, while smaller particulate polymers (second size range) function as binders, allowing each segment to optimize its performance without compromising the other.
Solution Approach 2:
The patent implements local quality by assigning specific functional roles to different particle size fractions within the composition. Larger particulate polymers provide structural framework and primary adhesion, while smaller particulate polymers fill interstices and enhance secondary bonding, creating localized functional zones that collectively improve overall adhesiveness.
3Reliability
If reactive monomer units are introduced to improve adhesiveness, then bonding capability increases, but manufacturing complexity increases
Solution Approach 1:
The patent applies parameter changes by incorporating reactive monomer units with specific functional groups (carboxyl, hydroxyl, amino, epoxy) into the polymer structures. These chemical parameter modifications enable reactive bonding mechanisms that significantly enhance adhesiveness, while the use of well-established polymer chemistry maintains manufacturing feasibility.
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 in devices like lithium ion secondary batteries.
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.