Sulfide Solid Electrolyte Composite Powder for Fine-Particle Handling
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Solution Overview
Problem
The production of sulfide solid electrolytes is hindered by the poor reactivity of aluminum oxide and nitride with other sulfide solid electrolyte raw materials, leading to long synthesis times and issues with fine particle scattering and handling due to static electricity, which complicates moisture control.
Innovation Solution
A method involving the addition of fine particles with a BET specific surface area of 5 m²/g or more to a solution containing sulfide solid electrolyte raw materials, followed by dispersion and solvent removal to produce a composite powder, which is then used to create a sulfide solid electrolyte composite through solid phase or melting methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If fine particles with small particle diameter are used to improve reactivity and reduce synthesis time, then lithium ion conductivity is improved and synthesis time is reduced, but the fine particles are easily scattered by air flow and adhere to container walls due to static electricity, causing component deviation
Solution Approach 1:
The patent introduces a binder as an intermediary substance that coats the fine particles (aluminum oxide or nitride) with a material having lower specific surface area. This binder acts as a mediator that reduces the electrostatic charge on fine particles, preventing them from scattering in air flow and adhering to container walls, while still allowing them to react with sulfide solid electrolyte raw materials to improve lithium ion conductivity.
Solution Approach 2:
The patent changes the physical and chemical parameters of the fine particles by coating them with a binder, thereby reducing their specific surface area and electrostatic charge. This parameter change transforms the fine particles from a state that is easily scattered by air flow to a state that can be handled normally, while maintaining their reactivity with sulfide solid electrolyte raw materials.
2Productivity
If fine particles are used to improve reactivity, then synthesis time is reduced, but moisture control becomes necessary which complicates the handling process
Solution Approach 1:
The binder serves as a protective intermediary layer on the fine particles, creating a barrier that reduces their sensitivity to moisture. This allows the fine particles to be handled in normal environments without requiring complex moisture control systems, while still maintaining their reactivity with sulfide solid electrolyte raw materials for improved synthesis efficiency.
3Reliability
If aluminum oxide or nitride is mixed with sulfide solid electrolyte raw material to improve lithium ion conductivity, then lithium ion conductivity is improved, but the reactivity with other raw materials is poor leading to long synthesis time
Solution Approach 1:
The patent changes the surface properties of aluminum oxide or nitride particles by coating them with a binder, thereby modifying their reactivity parameters. This allows them to maintain their function in improving lithium ion conductivity while significantly improving their reactivity with sulfide solid electrolyte raw materials, reducing synthesis time from hours to minutes.
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 approach results in a sulfide solid electrolyte composite with improved handleability and reduced particle deviation, enhancing lithium ion conductivity and preventing battery performance deterioration.
Implementation Method 1
adding fine particles having a BET specific surface area of 5 m²/g or more to a solution containing at least one sulfide solid electrolyte raw material to obtain a dispersion liquid of the fine particles
Implementation Method 2
a composite powder obtained by removing a solvent
Data Source
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AI summary
Provided is a method for producing a sulfide solid electrolyte complex, comprising: adding microparticles having a BET specific surface area of 5 m2/g or greater to a solution containing at least one type of sulfide solid electrolyte raw material, and dispersing the microparticles in the solution, to obtain a microparticle dispersion liquid; removing a solvent from the microparticle dispersion liquid to obtain a complex powder of the microparticles and the sulfide solid electrolyte raw material; and obtaining a sulfide solid electrolyte complex using the complex powder.