Lithium-Stuffed Garnet Setter Plates for Stable Electrolyte Sintering
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Solution Overview
Problem
Existing methods for fabricating solid electrolytes for lithium rechargeable batteries face challenges such as insufficient Li+ ion conductivity, cycle life at high current density and low temperatures, and compatibility with battery components, particularly due to the use of conventional setter plates that can cause lithium diffusion and composition changes.
Innovation Solution
The use of lithium stuffed garnet setter plates, which have the same or similar composition to the solid electrolyte, to sinter lithium stuffed garnet solid electrolytes, thereby maintaining the chemical composition and reducing lithium diffusion, resulting in superior ionic conductivity and mechanical integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional setter plates are used to sinter solid electrolytes, then the sintering process can be completed, but lithium diffusion occurs and chemical composition changes
Solution Approach 1:
A lithium-containing buffer layer is introduced between the conventional setter plate and the solid electrolyte. This buffer layer acts as an intermediary that prevents direct lithium diffusion from the electrolyte to the setter plate, while still allowing the sintering process to proceed. The buffer layer composition is controlled to be between 0.1-5 micrometers thickness, providing sufficient barrier properties.
Solution Approach 2:
The chemical composition parameters of the buffer layer are specifically controlled to prevent lithium diffusion. The buffer layer contains lithium at concentrations that create a chemical potential gradient opposing lithium loss from the electrolyte. By adjusting the buffer layer composition and thickness, the system maintains chemical stability during sintering.
2Device complexity
If conventional setter plates are used for sintering, then the process is simple, but Li+ ion conductivity is insufficient
Solution Approach 1:
The buffer layer serves as a mediator that prevents harmful lithium diffusion while maintaining process simplicity. It allows the use of conventional setter plates without requiring specialized equipment, thus maintaining ease of manufacture while improving ionic conductivity through composition stabilization.
Solution Approach 2:
The system becomes a composite structure with three layers: the conventional setter plate, the lithium-containing buffer layer, and the solid electrolyte. This composite approach combines the simplicity of conventional plates with the benefits of lithium stabilization, achieving both low complexity and high reliability.
3Ease of manufacture
If conventional setter plates are used, then manufacturing is easier, but mechanical integrity deteriorates
Solution Approach 1:
The buffer layer acts as a mechanical intermediary that prevents direct contact between the setter plate and the solid electrolyte. This eliminates mechanical stress transfer and potential damage during handling, while still allowing the simple sintering process to proceed. The buffer layer absorbs and distributes mechanical stresses.
4Stability of the object's composition
If lithium diffusion is prevented using buffer layers, then chemical composition is maintained, but device complexity increases
Solution Approach 1:
By controlling the buffer layer thickness to be between 0.1-5 micrometers and adjusting lithium concentration within specific ranges, the system achieves effective lithium diffusion prevention without excessive complexity. These parameter optimizations balance performance improvement with manufacturing feasibility.
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
The lithium stuffed garnet setter plates produce solid electrolytes with enhanced ionic conductivity, mechanical integrity, and uniform thickness, while preventing lithium diffusion and maintaining the chemical composition, thus addressing the limitations of conventional methods.
Implementation Method 1
conventional setter plates that can cause lithium diffusion and composition changes
Implementation Method 2
sintering the green film between the two setter plates
Data Source
AI summary
Setter plates are fabricated from Li-stuffed garnet materials having the same, or substantially similar, compositions as a garnet Li-stuffed solid electrolyte. The Li-stuffed garnet setter plates, set forth herein, reduce the evaporation of Li during a sintering treatment step and/or reduce the loss of Li caused by diffusion out of the sintering electrolyte. Li-stuffed garnet setter plates, set forth herein, maintain compositional control over the solid electrolyte during sintering when, upon heating, lithium is prone to diffuse out of the solid electrolyte.