Solid Electrolyte Spray Drying for Narrow Particle Distribution
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Solution Overview
Problem
Existing methods for producing solid electrolytes are inefficient, requiring multiple steps and high production costs, and struggle to achieve a sharp particle size distribution and small median size, which are essential for optimal battery performance.
Innovation Solution
A method involving mixing a raw material-containing substance with a solvent to prepare a solution of an intermediate, followed by spraying this solution using a spray drying apparatus at a pressure of 0.01 MPa or more, allowing for simultaneous solvent removal and control of particle size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a pulverization apparatus is used to control particle size, then particle size distribution is sharpened, but the production process requires multiple steps and production cost increases
Solution Approach 1:
The invention extracts and removes the pulverization step from the production process. By using spray drying technology, particle size control is achieved directly during the synthesis process without requiring subsequent mechanical pulverization, thereby simplifying the production process while maintaining sharp particle size distribution
Solution Approach 2:
The invention performs particle size control in advance during the spray drying synthesis process. The particle size is determined by the spray drying parameters (spray pressure, drying conditions) rather than being controlled afterward by pulverization, which eliminates the need for multiple process steps
2Productivity
If solution synthesis is used to improve productivity, then a pulverization apparatus is still necessary for particle size control, but productivity improvement is limited
Solution Approach 1:
The invention merges the synthesis process and particle size control process into a single spray drying operation. The synthesis reaction and particle formation occur simultaneously during spray drying, eliminating the need for separate pulverization steps and thereby improving productivity while reducing device complexity
Solution Approach 2:
The spray drying apparatus performs multiple functions simultaneously: it serves as both the synthesis reactor and the particle size control device. This multi-functionality eliminates the need for separate pulverization equipment and improves overall production efficiency
3Reliability
If particle size is decreased to improve contact interface, then ionic and electronic conduction paths are improved, but production complexity increases with traditional methods
Solution Approach 1:
The invention replaces the mechanical pulverization system with a spray drying system that uses fluid dynamics and thermal processing. By controlling spray pressure and drying conditions, small particle sizes are achieved directly during synthesis, improving ionic conductivity without requiring complex mechanical pulverization equipment
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 results in a solid electrolyte with a sharp particle size distribution and small median size, enhancing ionic conductivity and overall battery performance while simplifying the production process and reducing costs.
Implementation Method 1
spraying the intermediate (1) solution using a spray drying apparatus
Data Source
Figure 1~2
AI summary
Provided is a method for producing a solid electrolyte, the method including mixing a raw material-containing substance that contains a lithium atom, a phosphorus atom, and a sulfur atom with a solvent to prepare a solution of an intermediate (1), and spraying the intermediate (1) solution using a spray drying apparatus, or spraying the intermediate (1) solution using a spray drying apparatus at a spraying pressure of the spray drying apparatus of 0.01 MPa or more, as method for producing a solid electrolyte, superior in the productivity and giving a sharp particle size distribution, a small median size (D50), and a superior ionic conductivity. Also provided is a solid electrolyte having a prescribed median size (D50) and particle size distribution.