Battery Separator Coating for Wet-Stable Electrode Adhesion
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Solution Overview
Problem
Existing separators for non-aqueous secondary batteries face issues with adhesion to electrodes during manufacturing, leading to potential peeling and gas generation, which can cause short circuits and affect battery performance.
Innovation Solution
A separator comprising a heat-resistant porous layer with aromatic type resin and inorganic particles, and an adhesive layer with phenyl group-containing acrylic type resin particles, which provides excellent adhesion through both dry and wet heat pressing, and includes barium sulfate particles to reduce gas generation.
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 is lost when impregnated with electrolytic solution
Solution Approach 1:
The separator uses 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 resin particles. This composite material design enables the separator to achieve both strong initial adhesion during dry heat press and sustained adhesion after electrolytic solution impregnation, resolving the contradiction between manufacturing yield and adhesion stability.
Solution Approach 2:
The adhesive layer's composition parameters are specifically optimized with phenyl group-containing acrylic resin particles that exhibit enhanced adhesion properties. The aromatic resin in the heat-resistant porous layer also contributes to adhesion through aromatic interactions. These parameter changes in material composition enable the separator to maintain adhesion under both dry and wet conditions.
2Duration of action of moving object
If conventional separator is used, then gas generation occurs during charge-discharge cycles, but battery performance stability deteriorates
Solution Approach 1:
The heat-resistant porous layer contains inorganic particles distributed within a porous structure formed by aromatic resin. This porous material design provides multiple functions: maintaining ion permeability for battery operation while suppressing gas generation through the inorganic particles' gas-absorbing properties and the porous structure's ability to accommodate volume changes during charge-discharge cycles.
Solution Approach 2:
The separator's physical and chemical parameters are optimized through the specific composition of aromatic resin and inorganic particles in the heat-resistant porous layer. These parameter changes enable the separator to suppress gas generation during repeated charge-discharge cycles while maintaining battery performance stability.
3Manufacturing precision
If electrode and separator are bonded by dry heat press, then displacement is reduced during manufacturing, but peeling occurs after electrolytic solution impregnation
Solution Approach 1:
The separator employs a composite structure where the adhesive layer containing phenyl group-containing acrylic resin particles provides strong bonding capability. The heat-resistant porous layer with aromatic resin and inorganic particles provides structural support and additional adhesion through aromatic interactions. This composite material design ensures both manufacturing precision and sustained bond strength.
Solution Approach 2:
The adhesive layer acts as an intermediary between the electrode and the heat-resistant porous layer, providing enhanced adhesion. The phenyl group-containing acrylic resin particles in the adhesive layer mediate the bonding interface, ensuring strong initial adhesion during dry heat press and preventing peeling after electrolytic solution impregnation.
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 separator ensures strong adhesion to electrodes, reducing the likelihood of peeling and gas generation, thereby enhancing battery stability and performance.
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, in which 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
Implementation Method 3
in which the inorganic particles include barium sulfate particles
Data Source
AI summary
In one embodiment of the present invention, provided is 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, and in which the inorganic particles include barium sulfate particles.