Solid-State Battery Outermost Layer for Insulation and Moisture Resistance
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Solution Overview
Problem
Existing all-solid-state batteries face challenges with insulation properties and moisture resistance, which affect their reliability, especially in applications requiring high capacity and safety.
Innovation Solution
Incorporating an outermost layer composed of an epoxy resin and glass particles, including boron oxide, silicon oxide, and aluminum oxide, which do not contain lithium oxide, to enhance insulation and moisture resistance, and optionally including an insulating layer and margin layers to further improve these properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an all-solid-state battery uses a solid electrolyte layer without additional protective layers, then the battery structure is simple, but the insulation properties and moisture resistance are insufficient
Solution Approach 1:
The patent applies composite materials by combining epoxy resin and glass particles to form an outermost layer. This composite structure provides both insulation properties and moisture resistance, resolving the contradiction between reliability improvement and structural complexity. The glass particles embedded in the epoxy resin matrix create a synergistic effect that enhances both electrical insulation and barrier properties against moisture.
Solution Approach 2:
The patent uses a thin film approach by forming an outermost layer with epoxy resin and glass particles on the surface of the solid electrolyte layer. This thin protective film provides effective insulation and moisture barrier functions without significantly increasing the overall battery thickness or structural complexity, thus resolving the contradiction between reliability and device complexity.
2Adaptability or versatility
If the battery is exposed to high temperature during reflow process, then the battery can be mounted on substrate, but moisture resistance becomes critical for maintaining reliability
Solution Approach 1:
The epoxy resin-based outermost layer acts as a flexible protective shell that provides effective moisture barrier properties. This thin film structure maintains the battery's adaptability for mounting on substrates while simultaneously protecting against moisture penetration, thus resolving the contradiction between adaptability and resistance to harmful factors.
Solution Approach 2:
The composite structure of epoxy resin and glass particles creates a material with enhanced moisture barrier properties while maintaining thermal stability for high-temperature reflow processes. This composite material enables the battery to be mounted on substrates while effectively resisting moisture penetration, resolving the contradiction between adaptability and moisture resistance.
Data Source
AI summary
An all-solid-state battery according to present disclosure includes a cell stack including a solid electrolyte layer, and a positive electrode layer and a negative electrode layer with the solid electrolyte layer disposed therebetween, and an outermost layer disposed on one surface or both surfaces of the cell stack in a stacking direction of the positive electrode layer, the solid electrolyte layer, and the negative electrode layer. The outermost layer includes an epoxy resin and glass particles, and the glass particles include a boron (B) oxide, a silicon (Si) oxide, and an aluminum (Al) oxide.