Intermediate Layer Adhesion for Battery Separator Peeling
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Solution Overview
Problem
Non-aqueous electrolyte secondary batteries with enlarged areas tend to distort under external forces, leading to deviation or peeling between the cathode and separator, or between the anode and separator, which compromises capacity retention.
Innovation Solution
An intermediate layer formed from aqueous latex with polymer particles containing a copolymer derived from unsaturated dibasic acid, unsaturated dibasic acid monoester, and vinylidene fluoride-based monomers is used to enhance adhesion between the cathode, anode, and separator, ensuring strong adherence and improved adhesive strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the battery area is enlarged to achieve larger capacity, then the battery capacity increases, but the laminate becomes prone to distortion and peeling under external forces
Solution Approach 1:
An intermediate layer comprising a fluororesin binder and inorganic filler is introduced between the electrodes and separator. This intermediate layer acts as a mediator that enhances adhesion, prevents peeling, and maintains structural integrity of the enlarged battery laminate under external forces while preserving the increased capacity
2Quantity of substance
If the battery area is enlarged to achieve larger capacity, then the battery capacity increases, but distortion occurs under external forces
Solution Approach 1:
The intermediate layer is formulated as a composite material combining fluororesin binder with inorganic filler particles. This composite structure provides both flexibility to accommodate size and rigidity to resist distortion, enabling the enlarged battery to maintain structural stability under external forces while achieving larger capacity
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 effectively maintains long capacity retention and enlarged area performance of non-aqueous electrolyte secondary batteries by preventing distortion and peeling, ensuring reliable battery performance.
Implementation Method 1
an intermediate layer formed from an aqueous latex, the aqueous latex comprising polymer particles dispersed in water, the polymer particles containing a copolymer comprising a structural unit derived from an unsaturated dibasic acid, and/or a structural unit derived from an unsaturated dibasic acid monoester, and a structural unit derived from a vinylidene fluoride-based monomer
Data Source
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AI summary
Provided are a structure for non-aqueous electrolyte secondary batteries in which at least one of a cathode with a separator and an anode with a separator are strongly adhered, an aqueous latex used to obtain the structure for non-aqueous electrolyte secondary batteries, and a separator/intermediate layer laminate. The aqueous latex according to the present invention contains polymer particles dispersed in water, the polymer particles containing a copolymer comprising a structural unit derived from an unsaturated dibasic acid, and/or a structural unit derived from an unsaturated dibasic acid monoester, and a structural unit derived from a vinylidene fluoride-based monomer, the aqueous latex being used in production of an intermediate layer to be provided in a structure for non-aqueous electrolyte secondary batteries having a cathode, an anode, and a separator laminated between the cathode and the anode, the intermediate layer being provided in at least one of between the cathode and the separator and between the anode and the separator.