Sealing Tape Structure for Stress-Resilient Solid-State Batteries
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Solution Overview
Problem
All-solid-state rechargeable batteries face challenges in maintaining a stable cell structure and preventing stress damage to the solid electrolyte due to changes in the thickness of the negative electrode active material layer during charge and discharge.
Innovation Solution
A sealing tape with a substrate and an adhesive layer is developed, featuring a creep value of greater than or equal to 500 μm at 45°C and a shear strength of greater than or equal to 0.98 kgf/cm² at 45°C, which helps disperse stress and maintain uniform pressure on the battery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a sealing tape with high creep value is used to accommodate electrode thickness changes, then the stress on solid electrolyte is reduced, but the shear strength may be compromised
Solution Approach 1:
The sealing tape uses an adhesive layer with specifically controlled parameters: glass transition temperature of -50°C to -5°C and molecular weight of 800,000 to 3,500,000 g/mol. These parameter changes enable the adhesive to exhibit high creep resistance at operating temperatures while maintaining adequate shear strength, resolving the contradiction between structure stability and strength.
Solution Approach 2:
The sealing tape is constructed as a composite material system consisting of a substrate and an adhesive layer with specific properties. This composite structure combines the mechanical support of the substrate with the stress-absorbing characteristics of the specially formulated adhesive layer, achieving both required stability and strength.
2Strength
If the adhesive layer thickness is increased to improve adhesion, then the adhesive force increases, but the creep value to thickness ratio decreases
Solution Approach 1:
The adhesive layer thickness is precisely controlled within 5 μm to 50 μm, and the adhesive polymer's molecular weight is set between 800,000 to 3,500,000 g/mol with glass transition temperature of -50°C to -5°C. These parameter changes ensure optimal balance between adhesive force and creep characteristics, achieving both strong bonding and adequate adaptability.
3Volume of moving object
If the sealing tape is made thinner to reduce battery size, then the overall battery thickness decreases, but the adhesive force and structural integrity may be compromised
Solution Approach 1:
The substrate thickness is controlled at 5 μm to 50 μm and the adhesive layer at 5 μm to 50 μm, with the adhesive polymer having high molecular weight (800,000 to 3,500,000 g/mol). These parameter changes enable the thin sealing tape to maintain sufficient adhesive force (≥300 gf/mm at 25°C) and structural integrity while minimizing battery thickness.
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 sealing tape effectively improves the coulombic efficiency and cycle-life of the all-solid-state rechargeable battery by maintaining excellent contact between solids and preventing damage to the solid electrolyte.
Implementation Method 1
the sealing tape has a creep value of greater than or equal to about 500 μm at 45° C. and a shear strength of greater than or equal to about 0.98 kgf/cm2 at 45° C.
Data Source
AI summary
A sealing tape for an all-solid-state rechargeable battery including a substrate and an adhesive layer on a surface of the substrate, wherein the sealing tape has a creep value of greater than or equal to about 500 μm at 45° C. and a shear strength of greater than or equal to about 0.98 kgf/cm2 at 45° C.