Layered Solid Electrolyte Membrane for Strength and Ion Transport
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Solution Overview
Problem
Existing all-solid-state batteries face challenges in maintaining both high ionic conductivity and mechanical strength, with potential side reactions occurring at the interface between the solid electrolyte membrane and the negative electrode, which degrade battery performance.
Innovation Solution
A solid electrolyte membrane is designed with two layers, where the first layer contains a lower weight percentage of fibrous binder compared to the second layer, and both layers are manufactured without solvents, forming a strong, solvent-free structure that minimizes side reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the binder content in the solid electrolyte layer is increased to improve mechanical strength, then the strength is improved, but the ionic conductivity is reduced
Solution Approach 1:
The solid electrolyte membrane is divided into two distinct layers: a first solid electrolyte layer with lower binder content (0.1-5 wt%) for high ionic conductivity, and a second solid electrolyte layer with higher binder content (1-20 wt%) for mechanical strength. This segmentation allows each layer to optimize its function without compromise.
Solution Approach 2:
Different regions of the solid electrolyte membrane are assigned different binder contents tailored to their specific functional requirements. The first layer near the negative electrode uses low binder content to maximize ionic conductivity where ion transport is critical, while the second layer uses higher binder content to provide mechanical reinforcement where structural integrity is prioritized.
2Reliability
If a liquid electrolyte is used to secure the ionic conductivity of the solid electrolyte, then the ionic conductivity is improved, but the strength is reduced
Solution Approach 1:
The invention changes the physical state parameter of the electrolyte from liquid to solid, eliminating the strength problem associated with liquid electrolytes. The solid electrolyte layers maintain mechanical integrity while providing sufficient ionic conductivity through optimized composition and structure.
3Reliability
If the binder content is reduced to improve ionic conductivity, then the ionic conductivity is improved, but the strength is reduced
Solution Approach 1:
The solid electrolyte membrane is divided into two distinct layers: a first solid electrolyte layer with lower binder content (0.1-5 wt%) for high ionic conductivity, and a second solid electrolyte layer with higher binder content (1-20 wt%) for mechanical strength. This segmentation allows each layer to optimize its function without compromise.
4Strength
If the solid electrolyte membrane contains a binder, then the mechanical strength is improved, but side reactions occur at the interface with the negative electrode
Solution Approach 1:
The interface region near the negative electrode is designed with low binder content (first layer) to minimize side reactions, while the bulk region further from the electrode uses higher binder content (second layer) for mechanical strength. This local differentiation eliminates harmful binder-electrode interactions at the critical interface.
Data Source
AI summary
Disclosed is a solid electrolyte membrane, a method for manufacturing the same, and an all-solid-state battery including the same. More specifically, the solid electrolyte membrane includes a first solid electrolyte layer including a first solid electrolyte and a first fibrous binder and a second solid electrolyte layer including a second solid electrolyte and a second fibrous binder, stacked adjacent to each other, wherein the weight of the first fibrous binder relative to the total weight of the first solid electrolyte layer is less than the weight of the second fibrous binder relative to the total weight of the second solid electrolyte layer. Since the weight of a first fibrous binder included in the first solid electrolyte layer is less than the weight of the second fibrous binder included in the second solid electrolyte layer, the strength may be improved without lowering the ionic conductivity of the solid electrolyte membrane.