Solid Electrolyte Layering for Higher-Capacity Battery Reliability
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Solution Overview
Problem
Existing all-solid-state battery technologies face challenges in increasing capacity and reliability due to the limitations of solid electrolyte layer thickness and organic compound content, which can lead to increased electrical resistance and the risk of short circuits.
Innovation Solution
A battery design featuring a first solid electrolyte layer with a smaller thickness and lower organic compound content, combined with a second solid electrolyte layer of larger thickness and higher organic compound content, to optimize capacity and prevent short circuits without degrading characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the solid electrolyte layer thickness is increased to prevent short circuits, then reliability is improved, but capacity decreases
Solution Approach 1:
The solid electrolyte layer is divided into multiple sub-layers with different thicknesses and organic compound contents. The first sub-layer has smaller thickness and lower organic compound content, while the second sub-layer has larger thickness and higher organic compound content. This segmentation allows different regions to serve different functions, resolving the contradiction between preventing short circuits and maintaining capacity.
Solution Approach 2:
Different sub-layers of the solid electrolyte layer are assigned different local qualities in terms of thickness and organic compound content. The first sub-layer uses material with specific properties optimized for one function, while the second sub-layer uses material with different properties optimized for another function, allowing the system to simultaneously achieve both reliability and capacity.
2Reliability
If the organic compound content in the solid electrolyte layer is increased to improve bonding, then reliability is improved, but electrical resistance increases
Solution Approach 1:
The solid electrolyte layer is segmented into sub-layers with different organic compound contents. The first sub-layer has lower organic compound content to minimize electrical resistance, while the second sub-layer has higher organic compound content to provide adequate bonding strength. This segmentation resolves the contradiction between bonding strength and electrical resistance.
Solution Approach 2:
Different sub-layers are assigned different local qualities regarding organic compound content. The first sub-layer uses material with lower organic compound content for regions where electrical conductivity is critical, while the second sub-layer uses material with higher organic compound content for regions where bonding strength is critical, thereby resolving the contradiction locally.
Data Source
AI summary
A battery includes a first electrode, a first solid electrolyte layer in contact with the first electrode, a second electrode, and a second solid electrolyte layer located between the second electrode and the first solid electrolyte layer and in contact with the second electrode and the first solid electrolyte layer. An organic compound content of the first solid electrolyte layer is smaller than an organic compound content of the second solid electrolyte layer, and a thickness of the first solid electrolyte layer is smaller than a thickness of the second solid electrolyte layer.