Solid Electrolyte Binder Distribution for All-Solid-State Battery
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Solution Overview
Problem
All-solid-state batteries face issues with increased resistance and peeling-off of the solid electrolyte layer, which can lead to short circuits, particularly due to mechanical stress and uneven binder distribution.
Innovation Solution
The battery design incorporates a solid electrolyte layer with a non-facing portion having a higher binder content than the facing portion, creating a binder concentrated region to enhance adhesion and reduce resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the amount of binder in the solid electrolyte layer is increased to suppress peeling-off, then the adhesion of the solid electrolyte layer is improved, but the resistance of the solid electrolyte layer increases
Solution Approach 1:
The patent applies local quality by creating a non-facing portion in the solid electrolyte layer that extends beyond the cathode layer boundaries. This non-facing portion has different properties (higher binder content) compared to the facing portion, providing enhanced adhesion where needed (at the edges and non-facing areas) while maintaining lower resistance in the cathode-facing region where ionic conduction is critical.
Solution Approach 2:
The solid electrolyte layer is segmented into two distinct functional regions: a facing portion that contacts the cathode layer and a non-facing portion that extends beyond the cathode layer boundaries. This segmentation allows each region to be optimized independently - the facing portion for ionic conduction and the non-facing portion for mechanical adhesion and stress distribution.
2Stability of the object's composition
If the binder content is uniformly increased throughout the solid electrolyte layer, then peeling-off is suppressed, but the resistance increases across the entire layer
Solution Approach 1:
The patent implements local quality by concentrating the binder in the non-facing portion that extends beyond the cathode layer, while maintaining lower binder content in the cathode-facing portion. This localized binder distribution provides peeling resistance where mechanical stress is highest (at the edges and non-contact areas) without compromising the ionic conductivity in the cathode-facing region.
Solution Approach 2:
The non-facing portion acts as an intermediary region that mediates between the mechanical adhesion requirements and the electrical conduction requirements. It provides a transition zone with higher binder content that secures the solid electrolyte layer to the current collector and distributes mechanical stress, while the facing portion maintains optimal ionic conductivity for battery operation.
Data Source
AI summary
Provided is an all-solid-state battery which is configured to suppress an increase in the resistance of the all-solid-state battery and which is configured to suppress the peeling-off of the solid electrolyte layer. Disclosed is an all-solid-state battery comprising: a cathode comprising a cathode layer, an anode comprising an anode layer, and a solid electrolyte layer disposed between the cathode layer and the anode layer, wherein a width of the cathode layer is smaller than a width of the anode layer and a width of the solid electrolyte layer; wherein the solid electrolyte layer comprises a non-facing portion where the solid electrolyte layer does not face the cathode layer and a facing portion where the solid electrolyte layer faces the cathode layer; and wherein a binder content of the non-facing portion is larger than a binder content of the facing portion.