Flexible Solid Electrolyte Membrane with Porous Ion Conduction Paths
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Solution Overview
Problem
Sulfide-based solid electrolytes in all-solid-state batteries face challenges due to poor mechanical properties, processability, and chemical stability, which affect lithium ion conductivity and battery stability, especially when used in sheet form for mass production.
Innovation Solution
A flexible and unbreakable self-supporting solid electrolyte membrane is created using a substrate with pores, where a sulfide-based solid electrolyte and a cured compound are integrated, forming a conduction path for lithium ions, with a specific weight ratio and thickness, and manufactured using a slurry with a low-vapor-pressure solvent and monomers like triacrylate-based compounds, cured by UV irradiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sulfide-based solid electrolyte is used in sheet form for mass production, then lithium ion conductivity is improved, but mechanical properties and processability deteriorate
Solution Approach 1:
The patent creates a composite structure by coating the sulfide-based solid electrolyte onto a porous substrate. The substrate provides mechanical strength and flexibility, while the solid electrolyte layer maintains high lithium ion conductivity. This composite approach allows the sheet to withstand processing forces while preserving electrochemical performance.
Solution Approach 2:
The patent utilizes a porous substrate with controlled pore structure that allows the sulfide-based solid electrolyte to penetrate and fill the pores. This porous structure provides mechanical support and flexibility to the otherwise fragile solid electrolyte, enabling it to be processed in sheet form without compromising its ion conductivity function.
2Strength
If sulfide-based solid electrolyte is coated with separator, then mechanical strength is improved, but lithium ion conductivity deteriorates due to added resistance
Solution Approach 1:
The patent employs a porous substrate that allows complete penetration and filling by the sulfide-based solid electrolyte. The porous structure ensures continuous ion conduction paths without introducing additional resistance, unlike traditional separators. The substrate's porosity enables the solid electrolyte to form an integrated, conductive network while the substrate walls provide mechanical reinforcement.
3Ease of manufacture
If self-supporting film is manufactured using binder dissolved in solvent, then processability is improved, but lithium ion conductivity deteriorates due to poor chemical stability of sulfide-based solid electrolyte
Solution Approach 1:
The patent uses a porous substrate that can be processed with binder solutions, providing ease of manufacture. The porous structure allows uniform infiltration of the binder-solid electrolyte mixture, ensuring good adhesion and mechanical integrity during processing while maintaining the sulfide-based solid electrolyte's chemical stability and ion conductivity properties.
Solution Approach 2:
The patent creates a composite where the sulfide-based solid electrolyte is combined with a binder system on a porous substrate. This composite structure enables processability through conventional coating and drying methods while the substrate's porous architecture preserves the solid electrolyte's chemical stability and prevents degradation that would reduce lithium ion conductivity.
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 solution results in a flexible, thin, and highly conductive solid electrolyte membrane that maintains lithium ion conductivity and stability, even under pressure, enhancing the performance and safety of all-solid-state batteries.
Implementation Method 1
cured by UV irradiation
Data Source
AI summary
A flexible self-supporting solid electrolyte membrane, an all-solid-state battery including the membrane, and a manufacturing method thereof are disclosed. The solid electrolyte membrane may include: a substrate including pores therein; and a solid electrolyte layer disposed on at least one surface of the substrate and including a solid electrolyte and a cured compound. At least a portion of the solid electrolyte layer may penetrate into the pores of the substrate to form a conduction path of lithium ions in a thickness direction of the substrate.