Composite Solid Electrolyte Layer for All-Solid-State Batteries
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Solution Overview
Problem
The solid electrolyte layer in all-solid-state batteries is prone to cracking and detachment due to insufficient adhesion and deformability under stress, leading to decreased battery performance.
Innovation Solution
A composite solid electrolyte layer is produced by combining a solid electrolyte with a three-dimensional porous film containing a resin, where the pore diameter is greater than 2 μm and the softening temperature of the resin is lower than the crystallization temperature of the solid electrolyte, allowing for improved adhesion and deformability through a process involving slurry application and pressure application at controlled temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the solid electrolyte layer is formed by pressure-forming a solid, then the porosity is low and ion conductivity can be ensured, but the adhesion between particles is insufficient and the layer cannot follow stress, leading to cracking and detachment
Solution Approach 1:
The patent introduces a porous film as a scaffold structure that provides both mechanical support and pathways for ion transport. The porous structure allows the solid electrolyte particles to be arranged with adequate spacing, improving adhesion while maintaining ion conductivity through the interconnected pores.
Solution Approach 2:
The patent creates a composite structure combining the porous film with solid electrolyte particles. This composite approach allows the porous film to provide mechanical strength and adhesion, while the solid electrolyte particles provide ion conductivity, resolving the contradiction between these two properties.
2Reliability
If the solid electrolyte layer has low porosity to ensure ion conductivity, then electrical performance is improved, but the layer becomes rigid and prone to cracking under stress
Solution Approach 1:
The porous film acts as a flexible thin film substrate that can deform under stress without cracking. This flexible film allows the solid electrolyte layer to adapt to volume changes in the battery during charge-discharge cycles, preventing cracking while maintaining the low porosity needed for ion conductivity.
Solution Approach 2:
The porous structure of the film provides mechanical compliance that allows deformation under stress. The interconnected pores can compress and expand, enabling the layer to follow stress and volume changes while maintaining structural integrity and ion conductivity pathways.
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 composite solid electrolyte layer achieves a balance between electrical conductivity and deformability, reducing cracking and detachment, thereby enhancing the stability and performance of all-solid-state batteries.
Implementation Method 1
forming a precursor of the composite solid electrolyte layer by bringing the solid electrolyte into contact with the three-dimensional porous film
Implementation Method 2
applying pressure to the precursor while heating the precursor at a temperature which is 80° C. or more and which is less than a softening temperature of the three-dimensional porous film; wherein the softening temperature of the three-dimensional porous film is lower than a crystallization temperature of the solid electrolyte
Implementation Method 3
applying pressure to the precursor while heating the precursor
Data Source
AI summary
To provide a composite solid electrolyte layer with a balance between electrical conductivity and deformability, a method for producing the composite solid electrolyte layer, and a method for producing an all-solid-state battery comprising the composite solid electrolyte layer. Disclosed is a method for producing a composite solid electrolyte layer for all-solid-state batteries, herein the method comprises: preparing a solid electrolyte, preparing a three-dimensional porous film containing a resin, forming a precursor of the composite solid electrolyte layer by bringing the solid electrolyte into contact with the three-dimensional porous film, and applying pressure to the precursor while heating the precursor at a temperature which is 80° C. or more and which is less than a softening temperature of the three-dimensional porous film; wherein a pore diameter of the three-dimensional porous film is more than 2 μm; and wherein the softening temperature of the three-dimensional porous film is lower than a crystallization temperature of the solid electrolyte.