All-Solid-State Battery Structure for Electrolyte Contact and Crack Control
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Solution Overview
Problem
All-solid secondary batteries face challenges in maintaining sufficient contact between the positive and negative electrode layers and the solid electrolyte layer, leading to increased resistance and the formation of cracks during charge-discharge cycles, which can cause short circuits and deteriorate cycle characteristics.
Innovation Solution
The battery structure includes a positive electrode layer, a negative electrode layer, and a solid electrolyte layer, with an inactive member surrounding the positive electrode layer and featuring a position determination part to facilitate alignment and prevent cracks, thereby enhancing contact and reducing internal resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all-solid batteries use solid electrolytes instead of liquid electrolytes, then safety is significantly enhanced by reducing fire or explosion risk, but contact between electrode layers and solid electrolyte is insufficient leading to increased resistance
Solution Approach 1:
A buffering member is introduced as an intermediary component between the solid electrolyte layer and the electrode layers. This buffering member fills gaps and improves contact between the rigid solid electrolyte and the electrode layers, ensuring sufficient electrical contact while maintaining the safety advantages of solid electrolytes. The buffering member acts as a mediator that resolves the contact issue without compromising the fundamental solid electrolyte structure.
2Reliability
If solid electrolyte layer is used, then fire or explosion risk is reduced, but cracks form during charge-discharge cycles causing short circuits
Solution Approach 1:
The buffering member is positioned beforehand between the solid electrolyte layer and electrode layers to provide cushioning and stress distribution during charge-discharge cycles. This pre-positioned cushioning prevents the formation of cracks in the solid electrolyte layer by absorbing mechanical stresses that would otherwise cause fracturing, thereby maintaining the integrity and safety of the battery structure.
3Ease of manufacture
If inactive member with position determination part is added, then alignment and manufacturing ease are improved, but device complexity increases
Solution Approach 1:
The position determination part of the inactive member utilizes visual indicators (such as colored marks, patterns, or geometric features) that enable easy alignment during manufacturing. These visual cues allow workers or automated systems to quickly identify the correct positioning of the inactive member relative to the solid electrolyte layer and electrode layers, significantly improving manufacturing ease despite the added structural element.
Data Source
AI summary
Provided are an all-solid secondary battery, an all-solid secondary battery structure, and a method for manufacturing an all-solid secondary battery, the battery comprising a positive electrode layer, a negative electrode layer, and a solid electrolyte layer interposed between the positive electrode layer and the negative electrode layer, wherein the positive electrode layer includes a positive electrode current collector and a positive electrode active material layer disposed on one or both surfaces of the positive electrode current collector, and the negative electrode layer includes a negative electrode current collector and a first negative electrode active material layer disposed on the negative electrode current collector, the battery including an inactive member disposed to surround a side of the positive electrode layer, wherein the inactive member includes a position determination part configured to determine a position of the inactive member on the solid electrolyte layer.