Core-Shell Polymer Functional Layer for Battery Transfer
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Solution Overview
Problem
Conventional methods for manufacturing non-aqueous secondary battery members with functional layers face challenges in achieving balanced transferability and adhesion in electrolysis solutions, leading to suboptimal electrical characteristics such as high-temperature cycle and low-temperature output performance.
Innovation Solution
A laminate with a releasable substrate having a water contact angle of at least 70° and a functional layer containing organic particles with a specific core-shell structure, where the core has a degree of swelling between 5 to 30 times and the shell between 1 to 4 times in electrolysis solution, along with a binder with a glass-transition temperature between -50°C to 25°C, enhances transferability and adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If binder components are increased to ensure adhesion in electrolysis solution, then adhesion is improved, but transferability deteriorates due to excess adhesion to releasable substrate
Solution Approach 1:
The patent changes the chemical composition parameters of the functional layer by incorporating specific polymer particles (vinyl monomer component 30-70 mass%, hydrophilic functional group-containing monomer component 10-50 mass%, other monomer component 0-20 mass%) and controlling binder content (5-30 mass%). This parameter optimization ensures adequate adhesion in electrolysis solution while maintaining transferability to the substrate.
Solution Approach 2:
The patent uses a composite functional layer comprising multiple types of polymer particles with different functions: vinyl monomer particles for structural integrity, hydrophilic functional group-containing particles for adhesion enhancement in electrolysis solution, and optional conductive or non-conductive particles for additional functionality. This composite structure achieves balanced adhesion and transferability.
2Adaptability or versatility
If functional layer is temporarily provided on releasable substrate for transfer, then manufacturing flexibility is improved, but functional layer performance deteriorates due to insufficient adhesion or transferability
Solution Approach 1:
The patent prepares the functional layer with optimized composition and properties beforehand on the releasable substrate, ensuring it has the right balance of adhesion and transferability before the actual transfer process. The functional layer is pre-formed with specific polymer particle compositions and binder contents that enable successful transfer while maintaining performance.
Solution Approach 2:
The releasable substrate acts as an intermediary carrier that temporarily holds the functional layer during manufacturing. The substrate enables easy transfer of the functional layer to the final substrate through controlled adhesion and release mechanisms, providing manufacturing flexibility without compromising functional layer performance.
3Device complexity
If conventional functional layer composition is used, then manufacturing simplicity is maintained, but electrical characteristics deteriorate due to insufficient adhesion in electrolysis solution
Solution Approach 1:
The patent optimizes the composition parameters of the functional layer by specifying precise ranges for polymer particle types (vinyl monomer 30-70 mass%, hydrophilic functional group-containing monomer 10-50 mass%), binder content (5-30 mass%), and optional particle additions. These parameter changes improve adhesion in electrolysis solution and electrical characteristics while maintaining relatively simple manufacturing processes.
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
This approach allows for superior transferability and adhesion of the functional layer, resulting in improved electrical characteristics, including high-temperature cycle and low-temperature output performance of non-aqueous secondary batteries.
Implementation Method 1
the core is made of polymer having a degree of swelling in electrolysis solution of 5 times or more to 30 times or less
Implementation Method 2
the shell is made of polymer having a degree of swelling in electrolysis solution of greater than 1 time to 4 times or less
Implementation Method 3
bonding of the laminate to the substrate for non-aqueous secondary battery for transfer of the functional layer onto the substrate
Data Source
AI summary
Disclosed is a laminate for non-aqueous secondary battery which includes a functional layer that has superior transferability and may exert high function. The disclosed laminate includes a releasable substrate having a water contact angle of 70° or more, and a functional layer on the releasable substrate. The functional layer includes organic particles and a binder. The organic particles each have a core-shell structure having a core and a shell that partially covers an outer surface of the core. The core is made of polymer having a degree of swelling in electrolysis solution of 5 times or more to 30 times or less. The shell is made of polymer having a degree of swelling in electrolysis solution of greater than 1 time to 4 times or less.