Solid Electrolyte Layer Porosity Balance for Low Resistance
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Solution Overview
Problem
Existing solid electrolyte layers in solid-state batteries face issues where high basis weight increases resistance and low basis weight decreases tensile strength, necessitating a balance to optimize both properties.
Innovation Solution
A solid electrolyte layer comprising a nonwoven fabric with a volume ratio of 35% to 54% and porosity of 73% to 83% is used, ensuring effective contact between solid electrolyte grains while maintaining tensile strength, thereby reducing resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the basis weight of the nonwoven fabric is increased, then the tensile strength is improved, but the resistance increases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the volume ratio of the nonwoven fabric within 35-54% and porosity within 73-83%. This optimization balances the tensile strength (improved with higher basis weight) and resistance (increases with higher basis weight), resolving the technical contradiction through quantitative parameter adjustment
Solution Approach 2:
The patent uses a composite structure combining nonwoven fabric with solid electrolyte grains. This composite material approach allows the nonwoven fabric to provide mechanical strength while the solid electrolyte grains maintain ion conductivity, thus achieving both high tensile strength and low resistance simultaneously
2Object-affected harmful factors
If the basis weight of the nonwoven fabric is decreased, then the resistance is reduced, but the tensile strength decreases
Solution Approach 1:
The patent resolves this contradiction by establishing optimal parameter ranges: volume ratio of 35-54% and porosity of 73-83%. These parameter changes ensure that resistance is kept low while tensile strength is maintained at adequate levels
Solution Approach 2:
The patent utilizes porous nonwoven fabric with controlled porosity (73-83%) to reduce resistance by improving ion transport pathways. The porous structure allows ions to move more freely through the solid electrolyte layer while the nonwoven fabric framework maintains sufficient mechanical strength
Data Source
AI summary
The solid electrolyte layer for a solid-state battery includes a nonwoven fabric and a solid electrolyte, and the solid electrolyte is placed inside the nonwoven fabric, and the ratio of the volume of the nonwoven fabric to the volume of the solid electrolyte layer is 35% or more and 54% or less.