Solid Electrolyte Sheet Porous Layer Adhesion
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Solution Overview
Problem
Increasing the discharge capacity of all-solid-state batteries by enhancing the adhesiveness between the electrode and solid electrolyte layers is challenging, particularly as the electrode layer may peel off during the firing process, limiting charge and discharge functionality.
Innovation Solution
A solid electrolyte sheet with a porous second layer formed on the first solid electrolyte layer, featuring three-dimensionally connected voids to increase contact area and anchoring, reducing interfacial resistance and preventing peeling, achieved by a specific structure and production method involving multiple layers with varying porosity rates and surface roughness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the surface roughness of the solid electrolyte layer is increased to improve adhesiveness, then the adhesiveness between electrode layer and solid electrolyte layer is improved, but the electrode layer may peel off during firing process
Solution Approach 1:
The patent applies a porous layer on the solid electrolyte surface with controlled porosity (30-80%) and specific pore size (1-100 μm). This porous structure increases surface area for adhesion while the controlled connectivity and size prevent electrode material from detaching during firing, resolving the contradiction between improving adhesiveness and preventing peeling.
Solution Approach 2:
The patent creates a composite structure combining the dense solid electrolyte layer with a porous overlay layer. This composite architecture provides both the mechanical strength of the dense substrate and the high surface area of the porous surface, enabling simultaneous improvement of adhesiveness and peeling resistance.
2Quantity of substance
If the thickness of the electrode layer is increased to improve discharge capacity, then the discharge capacity is improved, but the electrode layer becomes more prone to peeling off
Solution Approach 1:
The porous layer provides a mechanically robust interface that can accommodate thicker electrode layers without peeling. The interconnected pore structure distributes stress evenly across the interface, allowing increased electrode thickness for higher discharge capacity while maintaining reliability.
3Manufacturing precision
If the surface roughness is increased to increase contact area, then the interfacial resistance is reduced, but the manufacturing complexity increases
Solution Approach 1:
The patent controls the porous layer parameters (porosity 30-80%, pore size 1-100 μm, thickness ratio) to achieve optimal interfacial contact. By defining specific parameter ranges, the patent reduces interfacial resistance while keeping the manufacturing process manageable through standardized parameter control.
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 improved adhesiveness and discharge capacity of all-solid-state batteries, with reduced interfacial resistance and a lower likelihood of electrode peeling, enabling higher energy density and efficient ionic conductivity.
Implementation Method 1
the second solid electrolyte layer is a porous solid electrolyte layer having three-dimensionally connected voids
Implementation Method 2
a curved line drawn along a surface of the second solid electrolyte layer is a profile line, a ratio of a length of the profile line to a length of the reference line
Data Source
AI summary
Provided is a solid electrolyte sheet capable of increasing the adhesiveness to the electrode layer and thus achieving an excellent discharge capacity. A solid electrolyte sheet 10 in which a second solid electrolyte layer 2 is formed on at least one of both surfaces of a first solid electrolyte layer 1, the second solid electrolyte layer 2 being a porous solid electrolyte layer.