Composite Solid Electrolyte Sheet for Peripheral Rigidity
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Solution Overview
Problem
Solid electrolyte secondary batteries face issues with low rigidity, leading to potential damage and short circuits between the positive and negative electrode layers, and limitations in securing a large ion conduction region due to insufficient rigidity of the solid electrolyte sheet.
Innovation Solution
A solid electrolyte sheet with a base containing a solid electrolyte and a plate-shaped reinforcing part made of a composite material, combining two electrical insulating members with different materials, providing increased rigidity around the periphery to enhance overall structural integrity and ion conduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the rigidity of the solid electrolyte sheet is increased to prevent damage and short circuits, then the reliability is improved, but the device complexity increases due to the need for additional reinforcing parts
Solution Approach 1:
The solid electrolyte sheet employs a composite structure consisting of a solid electrolyte layer and a reinforcing part made of different materials. The reinforcing part has higher rigidity than the solid electrolyte layer, creating a composite material system that enhances overall structural strength and prevents damage while maintaining the functional properties of the solid electrolyte.
Solution Approach 2:
The solid electrolyte sheet is divided into functionally distinct segments: a solid electrolyte layer for ion conduction and a separate reinforcing part for structural support. This segmentation allows each layer to be optimized for its specific function without compromising the other, resolving the contradiction between reliability and complexity.
2Productivity
If the size of the solid electrolyte sheet is increased to secure a large ion conduction region, then the productivity is improved, but the reliability deteriorates due to increased risk of damage from low rigidity
Solution Approach 1:
By incorporating a reinforcing part with higher rigidity into the solid electrolyte sheet, the composite structure enables the sheet to maintain high rigidity even when scaled up to larger sizes. This allows the ion conduction region to be expanded for improved productivity without sacrificing the reliability needed to prevent damage.
3Device complexity
If the rigidity of the solid electrolyte sheet is low to maintain simplicity, then the device complexity is reduced, but the reliability worsens due to potential damage and short circuits
Solution Approach 1:
The composite structure combining solid electrolyte material with a reinforcing part provides enhanced rigidity and damage prevention. While this does increase structural complexity, the use of standardized composite material layers maintains manufacturing simplicity and overall device ease of production.
Data Source
AI summary
A solid electrolyte sheet capable of increasing rigidity near an end surface of the solid electrolyte sheet, and a solid electrolyte secondary battery used with the solid electrolyte sheet are provided. A solid electrolyte sheet 10 includes a base 11 formed in a plate shape containing a solid electrolyte, and a plate-shaped reinforcing part 12 formed on an outside of the base, in which the reinforcing part 12 is made of a combination of two electrical insulating members different in material, and higher in rigidity than the base 11. Since rigidity near the periphery of the solid electrolyte sheet can be increased, a risk of damage near the periphery of the solid electrolyte sheet can be reduced.