3D Mesh Solid Electrolyte Membrane for Uniform Particle Filling
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Solution Overview
Problem
Existing solid electrolyte membranes for all solid type batteries face issues with inorganic solid electrolyte particle disconnection and inadequate ionic conductivity due to poor filling of particles within the nonwoven fabric, leading to low mechanical strength and flexibility.
Innovation Solution
A solid electrolyte membrane with a 3-dimensional mesh structure formed by entangled polymer filaments, filled with inorganic solid electrolyte particles, enhancing the fill ratio and contact between particles for improved ionic conductivity and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If solid electrolyte particles are impregnated into nonwoven fabric, then the membrane structure is formed, but the particles are only disposed in the superficial part and not inserted into the center, resulting in poor ionic conductivity
Solution Approach 1:
The nonwoven fabric is prepared in advance with controlled porosity and pore size distribution before particle impregnation. The fabric structure is pre-optimized to facilitate deep particle penetration during the slurry application process, ensuring uniform distribution from surface to center.
Solution Approach 2:
A nonwoven fabric with specific porosity (30-70%) and controlled pore size (1-100 μm) is used as the substrate. The porous structure allows slurry to penetrate deeply into the fabric, enabling uniform particle distribution throughout the membrane thickness while maintaining structural integrity.
2Reliability
If solid electrolyte particles are densely packed to improve ionic conductivity, then the fill ratio increases, but the mechanical strength and flexibility decrease
Solution Approach 1:
A composite structure is created where inorganic solid electrolyte particles are embedded within an organic binder matrix that is itself supported by the nonwoven fabric scaffold. This multi-phase composite maintains mechanical flexibility while achieving high particle fill ratio (60-80 vol%) for good ionic conductivity.
Solution Approach 2:
Different regions of the membrane have optimized properties: the nonwoven fabric provides mechanical strength and flexibility in the binder-rich regions, while the particle-dense regions provide high ionic conductivity. This spatial variation in material composition resolves the contradiction between strength and conductivity.
Data Source
AI summary
A solid electrolyte membrane and method of preparing, including a plurality of polymer filaments arranged crossed as a 3-dimensional structure in the form of a net of nonwoven fabric-like shape, and a plurality of inorganic solid electrolytes inserted and uniformly distributed in the structure. By this structural feature, a large amount of solid electrolyte particles are uniformly distributed and filled in the electrolyte membrane, contact between the particles is good, and ionic conduction paths are sufficiently provided. Additionally, the durability of the solid electrolyte membrane is improved by the 3-dimensional structure, and the flexibility and strength increase. The nonwoven fabric composite solid electrolyte membrane has an effect in preventing inorganic solid electrolyte particle from being disconnected therefrom.