Battery Functional Layer Composition for Inkjet Adhesion Balance
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Solution Overview
Problem
Existing techniques face challenges in ensuring inkjet ejection characteristics while achieving strong adhesion of battery members and enhancing the electrical characteristics of non-aqueous secondary batteries.
Innovation Solution
A composition for a non-aqueous secondary battery functional layer with specific surface tension and viscosity ranges, along with the inclusion of a particulate polymer having a core-shell structure, ensures inkjet ejection and strong adhesion, inhibiting lithium deposition and resistance increase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a composition for functional layer is applied by inkjet method, then inkjet ejection characteristics are improved, but adhesion strength of battery members deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the surface tension (20-35 mN/m) and viscosity (10-100 cP) of the functional layer composition to resolve the contradiction between inkjet ejection characteristics and adhesion strength. These parameter optimizations enable the composition to be properly ejected by inkjet method while maintaining strong adhesion after drying, directly addressing the technical contradiction.
2Strength
If adhesion strength is increased, then battery members adhere strongly, but inkjet ejection characteristics deteriorate
Solution Approach 1:
The patent resolves this contradiction by optimizing the composition parameters, specifically controlling surface tension within 20-35 mN/m and viscosity within 10-100 cP. These parameter ranges are carefully selected to balance the competing requirements: low enough viscosity and appropriate surface tension for good inkjet ejection, while maintaining sufficient adhesion strength after the functional layer dries.
3Ease of operation
If functional layer composition is optimized for inkjet application, then inkjet ejection is improved, but battery characteristics deteriorate
Solution Approach 1:
The patent applies parameter changes by optimizing the surface tension (20-35 mN/m) and viscosity (10-100 cP) of the functional layer composition to simultaneously achieve good inkjet ejection characteristics and excellent battery performance. The controlled parameters ensure proper application while maintaining the functional layer's ability to provide heat resistance, strength, and adhesion, thus improving both inkjet applicability and battery characteristics.
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 enables effective inkjet application, strong adhesion of battery members, and enhances the electrical performance of non-aqueous secondary batteries by suppressing resistance and adhesiveness deterioration.
Implementation Method 1
the difference between the surface tension at 30°C, which can be a temperature corresponding to an application temperature in inkjet coating, and the surface tension at 50°C, which can be a temperature corresponding to a drying temperature of a coating material obtained through application, is not more than a specific value
Implementation Method 2
the viscosity at 30°C is within a specific range
Data Source
Figure 1
AI summary
A composition for a non-aqueous secondary battery functional layer has a surface tension S30 at 30°C and a surface tension S50 at 50°C that satisfy condition (1) (S30 - S50) < 5 mN/m and condition (2) 30 mN/m ≤ S30 ≤ 50 mN/m, and has a viscosity at 30°C of not less than 1 mPa·s and not more than 50 mPa·s.