Solid Electrolyte Membrane with Porous Support for Thin Battery Films
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Solution Overview
Problem
Polymeric solid electrolyte membranes for lithium metal batteries suffer from low strength and vulnerability to lithium dendrite-induced insulation failure, limiting their application in all-solid-state batteries due to their thin film thickness and manufacturing challenges.
Innovation Solution
A method involving a laminate structure with a porous substrate and film-type solid electrolyte materials, where pressurization using a roll-press process fills the substrate pores with electrolyte materials, enhancing strength and ion conductivity while maintaining a thin film thickness of 70 μm or less.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a thin film of polymeric solid electrolyte material is formed to reduce battery thickness and improve energy density, then the battery thickness is reduced and energy density is improved, but the electrolyte membrane strength is insufficient and tearing occurs during manufacturing
Solution Approach 1:
The patent applies composite materials by combining polymeric solid electrolyte material with inorganic filler particles (such as oxides, sulfides, or nitrides). This composite structure provides both the flexibility and ion conductivity of the polymer and the mechanical strength of the inorganic filler, enabling thin film formation without tearing while maintaining adequate strength for manufacturing and operation.
Solution Approach 2:
The patent utilizes porous substrates with controlled pore structures to support the thin electrolyte film. The porous structure provides mechanical reinforcement while allowing ion transport, enabling the electrolyte membrane to maintain sufficient strength at reduced thickness while preserving ion conductivity for battery operation.
2Volume of moving object
If the electrolyte membrane is made thinner to improve energy density, then energy density is improved, but the membrane becomes vulnerable to damage from lithium dendrites and insulation failure occurs
Solution Approach 1:
The composite structure with inorganic filler particles embedded in the polymeric matrix provides enhanced puncture resistance against lithium dendrites. The inorganic particles distribute stress and prevent dendrite penetration, maintaining insulation reliability even in thin film configurations that improve energy density.
Solution Approach 2:
The patent implements local quality by creating regions with different compositions and properties within the electrolyte membrane. The inorganic filler is strategically distributed to provide localized reinforcement at critical points where dendrite formation is most likely, while maintaining overall thin film structure for high energy density.
3Ease of manufacture
If polymeric solid electrolyte material is used to reduce cost and improve processability, then manufacturing cost is reduced and processability is improved, but the material has low strength and requires complex protective layer structures
Solution Approach 1:
By incorporating inorganic filler particles into the polymeric solid electrolyte, the composite material achieves both the ease of processing and low cost of polymers and the high strength of inorganic materials. This eliminates the need for complex protective layer structures while maintaining manufacturability and mechanical integrity.
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 approach results in a solid electrolyte membrane with improved strength and ion conductivity, reducing manufacturing costs and enabling higher energy density batteries with enhanced reliability and safety.
Implementation Method 1
carrying out pressurization of the laminate structure so that the first and the second solid electrolyte materials may be pressed into the porous substrate and the pores of the porous substrate may be filled with the solid electrolyte materials
Data Source
AI summary
The present disclosure relates to an electrolyte membrane for an all-solid-state battery, an all-solid-state battery comprising the electrolyte membrane and a method for manufacturing the solid electrolyte membrane. The solid electrolyte membrane may be obtained by stacking a first protective layer, a first film-type solid electrolyte material, a porous substrate, a second film-type solid electrolyte material and a second protective layer successively to prepare a laminate structure; and carrying out pressurization of the laminate structure so that the first and the second solid electrolyte materials may be pressed into the porous substrate and the pores of the porous substrate may be filled with the solid electrolyte materials.