Dual-Layer Solid Electrolyte Membrane for Strength Without Conductivity Loss
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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.
Innovation Solution
A solid electrolyte membrane is designed with two layers, where the first layer contains a particulate binder and the second layer contains a fibrous binder, both manufactured without solvents, to enhance strength while minimizing side reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ionic conductivity of the solid electrolyte is increased, then battery performance is improved, but strength is reduced
Solution Approach 1:
The patent creates a composite structure where sulfide-based solid electrolyte particles (providing ionic conductivity) are embedded in a polymer binder matrix (providing mechanical strength). This allows the membrane to achieve both high ionic conductivity and sufficient mechanical strength for practical battery applications.
Solution Approach 2:
The patent optimizes the local composition and morphology of the solid electrolyte layer, controlling the particle size distribution and binder content to achieve optimal balance between ionic conductivity and mechanical strength in different regions of the membrane.
2Strength
If a binder is added to improve the strength of the solid electrolyte membrane, then mechanical strength is improved, but side reactions at the interface with the negative electrode increase
Solution Approach 1:
The patent carefully controls the binder content parameter, optimizing it to provide sufficient mechanical strength while minimizing side reactions. The patent also selects specific polymer materials with appropriate chemical stability to reduce interfacial reactions with the negative electrode.
Data Source
AI summary
Disclosed is a solid electrolyte membrane, a method for manufacturing the same, and an all-solid-state battery containing the same. More specifically, the solid electrolyte membrane includes a first solid electrolyte layer and a second solid electrolyte layer stacked adjacent to each other, and the first solid electrolyte layer has a structure in which particulate binders are dispersed, and the second solid electrolyte layer has a structure in which fibrous binders are entangled or connected to each other, and thus the strength may be improved without lowering the ionic conductivity of the solid electrolyte membrane. The solid electrolyte membrane may be substantially free of solvent.