Solid Electrolyte Membrane Structure for Strength and Ionic Conductivity
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Solution Overview
Problem
All-solid-state batteries face challenges in maintaining both high ionic conductivity and strength in their solid electrolyte membranes, which are essential for safety and performance, and side reactions at the interface between the solid electrolyte and negative electrode can degrade battery performance.
Innovation Solution
A solid electrolyte membrane is developed with a first layer containing a particulate binder and a second layer with a fibrous binder, both formed through a dry calendaring process without solvents, to enhance strength and minimize side reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a solid electrolyte membrane is used to improve safety, then fire safety is improved, but ionic conductivity is reduced
Solution Approach 1:
The patent uses a composite solid electrolyte membrane consisting of multiple layers with different compositions and properties. The membrane includes a first solid electrolyte layer and a second solid electrolyte layer, where each layer has optimized ionic conductivity and mechanical strength characteristics. This composite structure allows the system to achieve both high safety and adequate ionic conductivity by combining materials with complementary properties.
2Use of energy by moving object
If the ionic conductivity of the solid electrolyte is increased, then battery performance is improved, but strength is reduced
Solution Approach 1:
The solid electrolyte membrane is divided into multiple functional layers, each optimized for specific properties. The first solid electrolyte layer and second solid electrolyte layer are segmented to perform different functions - one layer prioritizes ionic conductivity while the other provides mechanical strength support. This segmentation allows each layer to be independently optimized without compromising the other properties.
Solution Approach 2:
Different regions of the solid electrolyte membrane have different local compositions and properties. The first layer has higher ionic conductivity characteristics while the second layer has higher mechanical strength characteristics. This local quality differentiation allows the membrane as a whole to achieve both high ionic conductivity and adequate strength by having different properties in different locations.
3Strength
If a binder is added to the solid electrolyte membrane to improve strength, then mechanical strength is improved, but side reactions at the interface with the negative electrode increase
Solution Approach 1:
The patent extracts or removes the binder component from the solid electrolyte membrane structure. By eliminating the binder that would otherwise be present in conventional solid electrolyte membranes, the invention prevents the side reactions that occur between binders and the negative electrode, while still maintaining adequate mechanical strength through the multi-layer composite structure.
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.