All-Solid-State Battery Layer Stack Against Moisture and Cracking
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Solution Overview
Problem
All-solid-state batteries face issues with moisture ingress and lithium ion diffusion, leading to deterioration and potential peeling or cracking of barrier layers during charge and discharge cycles, which affects the battery's stability and integration with semiconductor components.
Innovation Solution
The battery design includes a buffer layer with flexible and elastic materials like polyimide silicone, a barrier layer with silicon oxynitride, and an impact-resistant layer with epoxy resin and silica, along with a specific configuration of electrode extraction parts to prevent moisture ingress and lithium ion diffusion, ensuring the stability of the battery during expansion and contraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a barrier layer is directly formed on the outer layer of the all-solid-state battery, then moisture ingress is prevented, but peeling or cracking occurs during charge and discharge due to expansion and contraction
Solution Approach 1:
The patent introduces a buffer layer made of flexible and elastic material between the rigid barrier layer and the power storage layer. This buffer layer can deform elastically during battery expansion and contraction, preventing stress concentration that would cause the barrier layer to peel or crack, while still maintaining the moisture barrier function.
Solution Approach 2:
The patent creates a composite structure consisting of multiple layers with different properties: a flexible buffer layer (polyimide silicone) combined with a rigid barrier layer (silicon oxynitride). This composite structure combines the advantages of both materials - the flexibility to accommodate volume changes and the barrier properties to prevent moisture ingress.
2Object-affected harmful factors
If the barrier layer is made rigid to prevent moisture ingress, then barrier performance is improved, but the layer becomes susceptible to peeling and cracking during battery expansion and contraction
Solution Approach 1:
The buffer layer is designed as a flexible thin film that can deform elastically. This flexible layer absorbs the mechanical stress from battery expansion and contraction, protecting the rigid barrier layer from peeling and cracking while maintaining its moisture barrier function.
Solution Approach 2:
The buffer layer acts as a cushioning layer that is prepared in advance to absorb and distribute mechanical stresses. By placing this compliant layer between the rigid barrier layer and the power storage layer, the system preemptively protects against stress concentration that would otherwise cause barrier layer failure during charge-discharge cycles.
3Object-generated harmful factors
If lithium ion diffusion is prevented by a barrier layer, then semiconductor component protection is improved, but battery stability during expansion and contraction deteriorates
Solution Approach 1:
The patent applies different functional properties to different layers: the barrier layer provides lithium ion diffusion prevention and moisture barrier properties, while the buffer layer provides mechanical flexibility and elasticity. This local differentiation of material properties allows each layer to perform its specific function optimally without compromising the other.
Solution Approach 2:
The protective structure is segmented into multiple functional layers: a barrier layer for chemical protection (moisture and lithium ion diffusion prevention) and a buffer layer for mechanical protection (absorbing expansion and contraction). This segmentation allows independent optimization of each layer's properties to address different aspects of the technical problem.
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
This configuration effectively prevents moisture ingress and lithium ion diffusion, maintaining the battery's integrity and reducing the risk of peeling or cracking, thereby enhancing the battery's durability and compatibility with electronic circuits.
Implementation Method 1
a buffer layer covering the power storage part, the internal electrode, and a first part of the electrode extraction part
Implementation Method 2
The barrier layer plays a role of preventing not only the ingression moisture but also the diffusion of lithium ions from the all-solid-state battery
Implementation Method 3
an impact-resistant layer covering the barrier layer such that a second part of the electrode extraction part extends from the impact-resistant layer
Data Source
AI summary
An all-solid-state battery that includes a power storage part having a positive electrode layer, a negative electrode layer, and an electrolyte layer interposed between the positive electrode layer and the negative electrode layer; an internal electrode at an end surface of the power storage part; an electrode extraction part electrically connected to the internal electrode; a buffer layer covering the power storage part, the internal electrode, and a first part of the electrode extraction part; a barrier layer covering the buffer layer; and an impact-resistant layer covering the barrier layer such that a second part of the electrode extraction part extends from the impact-resistant layer.