Sulfide Electrolyte Multi-Step Sintering for Fast Uniform Crystallization
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Solution Overview
Problem
The existing methods for preparing sulfide electrolytes, such as solid-phase mixing and annealing sintering, are inefficient due to long sintering times and low heating rates, leading to non-uniform particle sizes and compromised electrolyte properties.
Innovation Solution
A multi-step sintering method combining microwave plasma sintering and annealing sintering in a muffle furnace is employed to quickly form crystal nuclei and compact the preform, ensuring uniform reaction growth and obtaining a sulfide electrolyte with high crystallinity and improved properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If solid-phase mixing and annealing sintering is used to prepare sulfide electrolyte, then the electrolyte material can be obtained through crystal nucleus formation and growth, but the sintering time is excessively long (4-48 hrs) due to low heating rate (2-5°C/min)
Solution Approach 1:
The patent replaces the conventional thermal conduction-based heating system with a microwave-based heating system. Microwave heating directly couples electromagnetic energy with the material, enabling rapid and uniform heating throughout the sample volume, thus dramatically reducing sintering time from hours to minutes while maintaining crystal nucleus formation uniformity
Solution Approach 2:
The patent changes the heating rate parameter from 2-5°C/min in conventional sintering to significantly higher heating rates achievable with microwave heating. This parameter change enables the sintering process to complete crystal nucleus formation and growth in minutes rather than hours, resolving the contradiction between speed and uniformity
2Productivity
If microwave plasma sintering is used to quickly form crystal nuclei and compact preform, then the sintering time is reduced and compactness is improved, but excessive temperature gradient causes hot spots and thermal runaway
Solution Approach 1:
The patent applies different heating strategies to different stages of the sintering process: rapid microwave heating is applied in the initial stage for quick crystal nucleus formation, followed by controlled conventional heating in later stages to eliminate temperature gradients and prevent thermal runaway, thus achieving both speed and stability
Solution Approach 2:
The patent employs a multi-stage heating protocol where microwave heating and conventional heating are applied in sequence. This periodic action allows the system to benefit from rapid microwave heating initially, then transition to stable conventional heating to prevent thermal runaway, resolving the contradiction between speed and reliability
3Manufacturing precision
If conventional muffle furnace sintering is used with low heating rate, then the material undergoes prolonged low-temperature sintering, but this leads to pore deformation and non-uniform particle sizes
Solution Approach 1:
The patent replaces conventional thermal conduction heating with microwave heating, which penetrates the material and heats it volumetrically rather than from the surface inward. This substitution eliminates prolonged low-temperature sintering, prevents pore deformation, and achieves uniform particle sizes in much shorter time
Solution Approach 2:
The patent changes the heating rate parameter from low (2-5°C/min) to high rates achievable with microwave heating. This parameter change allows the material to quickly reach optimal sintering temperature and maintain it briefly, preventing pore deformation and ensuring uniform particle sizes while dramatically reducing sintering duration
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 method significantly shortens the sintering time, enhances the crystallinity and uniformity of the sulfide electrolyte, and results in better electrolyte properties compared to single-step sintering methods.
Implementation Method 1
Microwave plasma sintering can form plasma by ionizing gas with microwaves, and then use the plasma as a heating source to increase the ambient temperature of a preform in the plasma to a high level instantly
Implementation Method 2
form plasma by ionizing gas with microwaves
Implementation Method 3
performing annealing sintering on the precursor material in a muffle furnace
Implementation Method 4
heating method and the heat conductivity of the electrolyte material
Data Source
AI summary
A method for preparing a sulfide electrolyte through multi-step sintering, comprising: performing microwave plasma sintering on a precursor material, and then performing annealing sintering on the precursor material in a muffle furnace to obtain a sulfide electrolyte. By adopting the multi-step sintering method combining microwave plasma sintering and annealing sintering in a muffle furnace, the process of forming crystal nuclei and compacting a preform can be completed quickly, the reaction uniformity of crystal gains in the growing process is guaranteed, and the sulfide electrolyte material with a high crystallinity, a uniform bulk phase and good properties can be obtained rapidly.