Solid-State Battery Buffer Layers to Block Silica Glass Reactions
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Solution Overview
Problem
Silica-based glass materials used in solid-state batteries react with electrode layers, leading to deterioration in discharge and charge-discharge characteristics and mechanical strength due to their high reactivity, especially when in direct contact over a large area.
Innovation Solution
Incorporating insulating buffer layers made of solid electrolyte between the electrode layers and the silica-based glass material to reduce the contact area and minimize reactions during the manufacturing process, thereby enhancing the battery's characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If silica-based glass material is used to cover the multi-layer body, then the battery element is protected with a dense and hard sintered body at relatively low firing temperature, but the silica-based glass material reacts with the electrode layers, deteriorating battery characteristics and mechanical strength
Solution Approach 1:
An insulating buffer layer is introduced as an intermediary between the silica-based glass material and the electrode layers. This buffer layer prevents direct contact and chemical reaction between the reactive glass material and the electrode layers, while still allowing the silica-based glass to provide its protective functions. The buffer layer acts as a mediator that resolves the contradiction by enabling the use of silica-based glass without its harmful reactive effects.
Solution Approach 2:
The protective structure is segmented into multiple layers: the silica-based glass material layer and the insulating buffer layer. By dividing the protective function into separate layers with different roles, the design allows the silica-based glass to provide mechanical strength and density while the buffer layer handles the chemical compatibility issue, thus resolving the contradiction between strength and reliability.
2Area of stationary object
If silica-based glass material is used in direct contact with electrode layers over a large area, then the protective coverage is maximized, but the reaction between the glass material and electrode layers increases, leading to deterioration in discharge and charge-discharge characteristics
Solution Approach 1:
The insulating buffer layer serves as a mediator that separates the silica-based glass material from the electrode layers across the entire contact area. This allows maximum coverage of the protective glass material while preventing harmful reactions, as the buffer layer blocks direct interaction between the glass and electrode materials throughout the interface.
Solution Approach 2:
The harmful reactive component is effectively extracted from the interface by introducing the buffer layer. The buffer layer removes the direct contact between the reactive silica-based glass and the electrode layers, extracting the harmful reaction pathway while preserving the protective coverage function of the glass material.
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 buffer layers effectively reduce the reaction between the electrode layers and the silica-based glass material, maintaining the battery's charge-discharge performance and mechanical strength by minimizing diffusion and heterogeneous element integration, resulting in improved battery characteristics.
Implementation Method 1
a solid electrolyte layer that is different from the silica-based glass material is formed between each outermost electrode layer and the silica-based glass material
Implementation Method 2
maintaining the battery's charge-discharge performance and mechanical strength by minimizing diffusion and heterogeneous element integration
Data Source
AI summary
A solid-state battery includes a multi-layer body, a silica-based glass material, and buffer layers. The multi-layer body includes a positive electrode layer and negative electrode layers, all of which are electrode layers, and includes solid electrolyte layers. The electrode layers and the solid electrolyte layer are alternately stacked, and for example, two of the negative electrode layers are located as the outermost layers. The silica-based glass material covers the multi-layer body. The buffer layers have an insulating property, and are formed between the outermost negative electrode layers of the multi-layer body and the silica-based glass material.