Solid-State Battery Exterior Material for Moisture Barrier Strength
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Solution Overview
Problem
Existing solid-state batteries face issues with insufficient water vapor barrier properties and mechanical strength due to the use of resin or glass materials in their exterior coatings, leading to moisture infiltration and performance degradation.
Innovation Solution
A solid-state battery design incorporating an exterior material made of a sintered body containing a glassy material and at least two crystalline materials, with a common element, to enhance both water vapor barrier properties and mechanical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If an exterior material using a resin material is used, then the battery structure is simple and easy to manufacture, but the water vapor barrier property is insufficient
Solution Approach 1:
The exterior material is constructed as a composite sintered body containing glassy material and crystalline materials. This composite structure combines the low-temperature processing advantages of glassy materials with the high water vapor barrier properties and mechanical strength of crystalline materials, resolving the contradiction between ease of manufacture and water vapor barrier performance.
2Reliability
If an exterior material using a glass material is used, then the water vapor barrier property is improved as compared with resin material, but the mechanical strength is insufficient
Solution Approach 1:
The sintered body combines glassy material with crystalline materials to create a composite structure where the crystalline materials provide enhanced mechanical strength while the glassy material maintains good water vapor barrier properties and enables low-temperature sintering.
Solution Approach 2:
By controlling the volume fraction of crystalline materials to be 40 vol% to 99 vol%, the invention optimizes the balance between mechanical strength and water vapor barrier property, achieving both improved strength and sufficient barrier performance.
3Strength
If the crystalline material volume fraction is increased to improve mechanical strength, then the mechanical strength is improved, but the sintering temperature may increase
Solution Approach 1:
The combination of glassy material and crystalline materials allows sintering at relatively low temperatures because the glassy material acts as a binder that facilitates sintering at lower temperatures than would be required for crystalline materials alone, while still achieving high mechanical strength through the crystalline phase content.
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 proposed exterior material significantly improves the battery's water vapor barrier and mechanical strength, ensuring better protection and performance.
Implementation Method 1
an exterior material covering a surface of the battery element body, wherein the exterior material is a sintered body containing a glassy material and at least two crystalline materials... excellent in water vapor barrier property
Implementation Method 2
the exterior material is a sintered body containing a glassy material and at least two crystalline materials... excellent in mechanical strength
Data Source
AI summary
A solid-state battery that includes a battery element body including a positive electrode layer and a negative electrode layer stacked with respect to each other with a solid electrolyte layer interposed therebetween; and an exterior material covering a surface of the battery element body, wherein the exterior material is a sintered body containing a glassy material and at least two crystalline materials, and the glassy material and the at least two crystalline materials contain at least one common element.