Adhesive Coating Layer for High-Speed Powder-Formed Electrodes
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Solution Overview
Problem
Conventional electrode production techniques for electrochemical devices face challenges in achieving high-speed formability and uniform electrode mixed material layer formation, leading to defects and reduced rate characteristics due to non-uniform distribution of composite particles.
Innovation Solution
An adhesive coating liquid containing a particulate polymer with specific swelling and tack strength properties is applied to form an adhesive layer between the current collector and electrode mixed material layer, ensuring close adherence and enhancing rate characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If powder forming technique is used for electrode production, then productivity is improved through high-speed manufacturing, but manufacturing precision deteriorates due to non-uniform distribution of composite particles
Solution Approach 1:
The patent applies preliminary action by pre-coating the current collector with an adhesive layer before powder forming. This adhesive layer is applied in advance to ensure uniform distribution and close adherence of composite particles during high-speed powder forming, thereby resolving the non-uniformity issue while maintaining high productivity
Solution Approach 2:
The adhesive layer serves as an intermediary between the current collector and the electrode mixed material layer. It mediates the interaction by providing a surface that ensures uniform distribution and strong adhesion of composite particles, enabling high-speed manufacturing without sacrificing layer uniformity
2Manufacturing precision
If adhesive coating liquid is applied to improve adherence, then manufacturing precision is improved through uniform particle distribution, but device complexity increases due to additional coating process
Solution Approach 1:
The patent merges the adhesive coating process with the existing electrode manufacturing workflow by integrating it as a preparatory step before powder forming. This combination approach maintains manufacturing precision while minimizing additional process complexity by consolidating functions into the existing production line
3Ease of manufacture
If conventional adhesive is used, then ease of manufacture is maintained through simple processing, but reliability deteriorates due to insufficient rate characteristics
Solution Approach 1:
The patent applies parameter changes by modifying the adhesive properties through controlled swelling in electrolyte solution. The adhesive layer's swelling ratio is optimized to enhance ionic conductivity and rate characteristics while maintaining ease of manufacture through simple coating application 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
The adhesive layer enables high-speed electrode production with reduced defects and improved rate characteristics in electrochemical devices.
Implementation Method 1
the adhesive includes a particulate polymer having a degree of swelling in electrolyte solution within a specific range
Implementation Method 2
applying an adhesive coating liquid onto the surface of a current collector to provide an adhesive layer
Data Source
Figure 1
AI summary
Provided is a new technique that can ensure high-speed formability during electrode production by powder forming while also causing an electrochemical device to display excellent rate characteristics. An adhesive coating liquid for an electrochemical device contains an adhesive and water. The adhesive includes a particulate polymer X having a degree of swelling in electrolyte solution, by mass, of not less than ×1.0 and not more than ×3.0. The adhesive coating liquid for an electrochemical device has a tack strength of 0.50 N or more as measured using a tackiness tester.