Solid Electrolyte Battery Layers With a Delamination-Buffer Mixture
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Solution Overview
Problem
The existing battery designs with stacked solid electrolyte layers face issues of delamination due to residual stress, leading to deteriorated output characteristics, as the glass electrolyte layer can become crushed during press forming, and different compression properties of stacked solid electrolyte materials result in delamination.
Innovation Solution
Incorporating a mixture layer between different solid electrolyte layers, where materials with varying Young's moduli are mixed, constituting more than 50% of the volume, to enhance adhesion and prevent delamination, thereby improving the output characteristics of the battery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If stacked solid electrolyte layers with different compression properties are used, then the battery structure is formed, but delamination occurs due to residual stress
Solution Approach 1:
A buffer layer is introduced between solid electrolyte layers with different compression properties. This buffer layer acts as an intermediary that absorbs residual stress and prevents delamination, allowing the battery structure to be formed while maintaining layer adhesion reliability.
Solution Approach 2:
The battery employs a composite electrolyte structure combining different solid electrolyte materials (e.g., oxide solid electrolyte and sulfide solid electrolyte) with a buffer layer. This composite approach leverages the advantages of each material while the buffer layer compensates for their incompatible compression properties, preventing delamination.
2Ease of manufacture
If glass electrolyte layer is used during press forming, then the battery is manufactured, but the layer becomes crushed leading to delamination
Solution Approach 1:
The buffer layer serves as a sacrificial or protective element during press forming. It absorbs the mechanical stress of manufacturing and protects the glass electrolyte layer from crushing, maintaining layer integrity while enabling successful manufacturing.
Solution Approach 2:
The buffer layer is positioned in advance between solid electrolyte layers to provide cushioning during press forming. This pre-positioned protection prevents the glass electrolyte layer from being crushed under compression, maintaining its structural integrity throughout manufacturing.
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 configuration of a mixture layer with a high volume fraction of low Young's modulus solid electrolyte materials improves bond strength between layers, inhibiting delamination and enhancing the battery's output characteristics, including ionic conductivity and thermal stability.
Implementation Method 1
one of the first solid electrolyte material and the second solid electrolyte material may have a Young's modulus lower than a Young's modulus of another of the first solid electrolyte material and the second solid electrolyte material, and the one of the first solid electrolyte material and the second solid electrolyte material may constitute a volume fraction of greater than 50% in the mixture layer
Data Source
AI summary
A battery includes a positive electrode, a negative electrode, and an electrolyte layer disposed between the positive electrode and the negative electrode. The electrolyte layer includes a first layer, a second layer, and a mixture layer disposed between the first layer and the second layer. The first layer includes a first solid electrolyte material. The second layer includes a second solid electrolyte material, the second solid electrolyte material being different from the first solid electrolyte material. The mixture layer includes the first solid electrolyte material and the second solid electrolyte material.