Battery Separator Adhesive Layer for Wet-State Electrode Bonding
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Solution Overview
Problem
Existing methods for manufacturing non-aqueous secondary batteries face challenges in achieving strong adhesion between the electrode and separator, leading to potential peeling issues during electrolyte impregnation, which can cause short circuits and affect battery stability.
Innovation Solution
A separator with a heat-resistant porous layer containing aromatic resin and inorganic particles, combined with an adhesive layer featuring phenyl group-containing acrylic type resin particles, is used to enhance adhesion through both dry and wet heat press methods, ensuring strong bonding and preventing peeling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dry heat press is used to bond electrode to separator, then manufacturing yield is improved and displacement is reduced, but adhesion strength deteriorates when impregnated with electrolytic solution
Solution Approach 1:
The adhesive layer uses phenyl group-containing acrylic type resin particles that change their adhesive properties based on the presence of electrolytic solution. The resin particles are designed to exhibit sufficient adhesion during dry heat press manufacturing, then develop enhanced adhesion strength after impregnation with electrolytic solution through swelling and softening effects
Solution Approach 2:
The separator comprises a composite structure with a heat-resistant porous layer containing aromatic resin and inorganic particles, combined with an adhesive layer containing phenyl group-containing acrylic type resin particles. This composite structure provides both manufacturing process stability and long-term adhesion reliability
2Reliability
If adhesive layer is added to separator, then adhesion to electrode is improved, but device complexity increases
Solution Approach 1:
The adhesive layer is applied locally only on one surface of the heat-resistant porous layer, specifically the surface that contacts the electrode. This localized approach provides adhesion functionality only where needed, avoiding unnecessary complexity in the entire separator structure
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 solution provides excellent adhesiveness to the electrode in both dry and wet states, reducing the risk of peeling and enhancing the stability and safety of non-aqueous secondary batteries.
Implementation Method 1
an adhesive layer that is provided on the heat-resistant porous layer, and that contains adhesive resin particles having a phenyl group-containing acrylic type resin, wherein the adhesive resin particles having a phenyl group-containing acrylic type resin are adhered to the heat-resistant porous layer
Implementation Method 2
a heat-resistant porous layer that contains an aromatic type resin and inorganic particles
Data Source
AI summary
A separator for a non-aqueous secondary battery, the separator including a heat-resistant porous layer that contains an aromatic type resin and inorganic particles, and an adhesive layer that is provided on the heat-resistant porous layer, and that contains adhesive resin particles having a phenyl group-containing acrylic type resin, in which the adhesive resin particles having a phenyl group-containing acrylic type resin are adhered to the heat-resistant porous layer.