Argyrodite Battery Interfacial Materials for Stability
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Solution Overview
Problem
Solid-state batteries face instability at the interface between the solid-state electrolyte and electrodes, leading to deterioration in battery performance due to interfacial reactivity and increased electrical resistance, particularly with lithium metal anodes.
Innovation Solution
The use of ionically conductive, electronically insulating interfacial materials such as binary and ternary halides and sulfides, which are chemically and thermally stable with argyrodite-based solid-state electrolytes, is introduced to stabilize the interfaces between the electrolyte and electrodes, reducing reactivity and enhancing battery performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If interfacial materials are introduced to stabilize the interface between electrodes and solid-state electrolyte, then chemical stability and reduced interfacial reactivity are improved, but device complexity increases due to additional layers
Solution Approach 1:
The patent introduces interfacial materials as intermediary layers between the solid-state electrolyte and electrodes. These materials act as mediators that prevent direct harmful interactions while maintaining functional interfaces. Specifically, the interfacial materials are selected to be chemically stable with both the argyrodite-based solid-state electrolyte and the electrode materials, thereby preventing degradation reactions and stabilizing the interface without requiring complex multi-layer structures.
2Duration of action of stationary object
If interfacial materials are used to prevent degrading reactions, then battery longevity is improved, but manufacturing complexity increases due to additional coating or layering steps
Solution Approach 1:
The interfacial materials are incorporated into the battery structure during the manufacturing process, before the battery begins operation. This preliminary action ensures that the protective interface is already in place to prevent degradation reactions from the outset. The materials are applied as coatings on electrodes or as separate layers during assembly, ensuring long-term stability without requiring post-manufacturing interventions or complex multi-step processes.
3Productivity
If interfacial materials are introduced to reduce electrical resistance, then charge transfer efficiency is improved, but the number of components increases
Solution Approach 1:
The interfacial materials are applied locally at the electrode-electrolyte interfaces where charge transfer occurs, rather than throughout the entire battery structure. This localized approach improves charge transfer efficiency at the critical interface regions without adding unnecessary components to other parts of the battery. The materials are deposited as thin coatings or thin layers specifically at the interfaces, maintaining productivity benefits while minimizing increases in overall device complexity.
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
These interfacial materials improve the stability and longevity of solid-state batteries by preventing degrading reactions, thus maintaining better performance over time by ensuring efficient lithium transport and reducing electrical resistance.
Implementation Method 1
The interfacial material is ionically conductive while being electronically insulating
Implementation Method 2
The interfacial material is ionically conductive while being electronically insulating
Implementation Method 3
chemically and thermally stable with argyrodite-based solid-state electrolytes
Implementation Method 4
chemically and thermally stable with argyrodite-based solid-state electrolytes
Data Source
AI summary
Particular embodiments may provide interfacial materials for a solid-state electrolyte interface. In some embodiments, the solid-state electrolyte is argyrodite-based. In some embodiments, the interfacial material may comprise a binary halide, a ternary halide, a binary sulfide, a ternary sulfide, or a combination thereof. In some embodiments, the interfacial material may be disposed at the interface of the anode and the solid-state electrolyte and/or the interface of the cathode and the solid-state electrolyte.