Microwave Milling Apparatus for Inorganic Electrolyte Synthesis
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Solution Overview
Problem
The synthesis, annealing, and particle size reduction of inorganic electrolytes, such as lithium-ion conducting argyrodites, are time and labor intensive and difficult to scale up due to the complexity of existing synthesis pathways and equipment requirements.
Innovation Solution
A method involving a microwave milling apparatus that simultaneously rotates a processing vessel containing particles and milling media within a microwave enclosure, using microwave susceptor media for efficient heat transfer and particle size reduction, allowing for the synthesis of argyrodite-type lithium ion solid electrolytes without the need for pre- and post-processing mixing and grinding, and enabling scalable, energy-efficient production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional synthesis pathways are used for inorganic electrolytes, then synthesis can be achieved, but the process is time and labor intensive and difficult to scale up
Solution Approach 1:
The patent combines multiple separate operations (synthesis, annealing, and particle size reduction) into a single simultaneous process using a planetary ball mill with microwave heating capability. This integration eliminates the need for sequential processing steps, thereby increasing productivity and reducing total processing time while maintaining product quality.
Solution Approach 2:
The microwave heating system provides continuous energy input throughout the milling process, enabling simultaneous synthesis and particle size reduction in a continuous manner rather than through discrete batch operations. This continuous action significantly reduces processing time and enables easier scaling up.
2Manufacturing precision
If multiple operations and pieces of equipment are used for initial synthesis and post-synthesis particle size control, then useful product can be produced, but device complexity increases
Solution Approach 1:
The patent integrates synthesis and particle size control functions into a single planetary ball mill device equipped with microwave heating. This consolidation reduces the number of separate equipment pieces from multiple devices to one integrated system, simplifying the overall equipment complexity while maintaining precise particle size control through the combined mechanical milling and thermal effects.
Solution Approach 2:
The planetary ball mill is designed to perform multiple functions simultaneously: it conducts synthesis reactions, controls particle size through milling, and provides annealing through microwave heating. This multi-functionality eliminates the need for separate specialized equipment for each operation, thereby reducing device complexity.
3Productivity
If traditional synthesis methods are used, then inorganic electrolytes can be synthesized, but energy efficiency is poor and scalability is limited
Solution Approach 1:
The patent replaces conventional external heating methods with direct microwave heating, which penetrates the material and heats it from within through dielectric heating. This substitution of heating mechanism significantly improves energy efficiency by reducing heat loss to the environment and enables more scalable production since microwave energy can be easily scaled up in power output.
Solution Approach 2:
The microwave heating system allows for rapid adjustment of temperature and power parameters during the synthesis process, enabling optimization of reaction conditions for different scales of production. This parameter flexibility improves both energy efficiency and scalability compared to traditional fixed-temperature furnace methods.
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 simplifies the synthesis process, achieves uniform distribution of elements, and produces a non-monolithic, powdered product with improved energy efficiency and scalability, reducing waste and processing time while maintaining high ionic conductivity.
Implementation Method 1
a microwave generator configured to generate and direct microwaves to the microwave enclosure
Implementation Method 2
heating the argyrodite precursor particles by contact with the microwave susceptor media
Implementation Method 3
moving the processing vessel to cause interactions between the particles and the milling media to thereby reduce the size of the particles
Data Source
AI summary
Methods for millling particles include exposing particles to microwave energy during milling. The methods reduce or eliminate the need for pre- and post-processing of reagents and products while minimizing waste associated with the slow kinetics of heat transfer in traditional resistive heating furnaces. Method of synthesizing particles include providing precursor particles, microwave susceptor media, and milling media in a reaction vessel and simultaneously rotating the reaction vessel while exposing the reaction vessel to microwaves. Apparatus for milling particles include a microwave housing defining a microwave enclosure; a microwave generator configured to generate and direct microwaves to the microwave enclosure; and a rotation shaft within the microwave enclosure, the rotation shaft connected or configured to be connected to a motor for rotation, wherein the rotation shaft is configured to be rotatably coupled, within the microwave enclosure, to a processing vessel.