Solid Electrolyte Film Densification for Higher Ionic Conductivity
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Solution Overview
Problem
All-solid-state batteries face limitations in ionic conductivity, which hinders their broader application due to the use of commercially available solid electrolytes, compromising both safety and performance.
Innovation Solution
A solid electrolyte film is fabricated by coating a substrate with a slurry containing sulfide-based or halide-based solid electrolytes, a binder, and a solvent, followed by drying and pressing at a temperature above the glass transition temperature of the binder, increasing the packing density and ionic conductivity of the film.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If liquid electrolyte is used together with solid electrolyte to secure ionic conductivity, then ionic conductivity is improved, but strength is reduced
Solution Approach 1:
The patent extracts and eliminates the liquid electrolyte component from the system entirely, relying solely on optimized solid electrolyte materials and processing methods to achieve high ionic conductivity. This removes the source of strength reduction while maintaining safety by keeping the system fully solid-state.
Solution Approach 2:
The patent changes the ionic conductivity parameters through solid electrolyte optimization (particle size, packing density, sintering conditions) rather than adding liquid components, thereby maintaining both high ionic conductivity and structural strength in the fully solid-state configuration.
2Adaptability or versatility
If solid electrolyte film with high ionic conductivity is developed, then application areas expand, but manufacturing complexity increases
Solution Approach 1:
The patent performs preliminary actions by pre-defining optimal particle size distributions (D10-D90 ranges), packing densities, and sintering parameters that can be directly applied in manufacturing. This standardization reduces manufacturing complexity while enabling broad application across different battery types and scales.
Solution Approach 2:
The patent establishes specific parameter ranges for solid electrolyte fabrication (particle size D10-D90, packing density, sintering temperature and time) that balance performance requirements with manufacturing feasibility, making high-performance solid electrolytes accessible for various applications without excessive complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method enhances the ionic conductivity of the solid electrolyte film to 0.1 to 10 mS/cm, improving the performance and safety of all-solid-state batteries while maintaining strength, thus expanding their application areas.
Implementation Method 1
pressing a coating layer at a temperature equal to or above a glass transition temperature (Tg) of the binder
Implementation Method 2
coating a substrate with a slurry including sulfide-based and/or halide-based solid electrolytes, a binder, and a solvent, followed by drying
Data Source
AI summary
The present disclosure relates to a solid electrolyte film, its fabrication method, and an all-solid-state battery including the same. More specifically, the solid electrolyte film comprises a slurry including a sulfide and/or halide-based solid electrolyte, a binder, and a solvent, coated on a substrate and then dried and pressed. By pressing at a temperature equal to or above a glass transition temperature (Tg) of the binder, the packing density of the solid electrolyte film is increased, thereby improving the ionic conductivity.