Sulfide Solid Electrolyte Composite Powder for Uniform Fine-Particle Mixing
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Solution Overview
Problem
Existing methods for producing sulfide solid electrolytes face challenges with poor reactivity of aluminum oxide and nitride with other raw materials, leading to long synthesis times and issues with fine particle scattering and handling, which complicates the production process.
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 create a composite powder, which is then used to produce a sulfide solid electrolyte composite.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If fine particles are used to improve reactivity and reduce synthesis time, then lithium ion conductivity is improved and synthesis time is reduced, but fine particles are easily scattered 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) and prevents them from scattering and adhering to container walls. This binder acts as a mediator between the fine particles and the environment, maintaining their uniform distribution during handling and mixing processes without requiring moisture control.
Solution Approach 2:
The patent changes the surface properties of fine particles by coating them with a binder, which modifies their electrostatic characteristics. This parameter change reduces the static electricity-induced adhesion and scattering problems while preserving the reactive surface area needed for improved synthesis kinetics and lithium ion conductivity.
2Reliability
If fine particles are used to improve reactivity, then lithium ion conductivity is improved, but moisture control is required which complicates handling and production
Solution Approach 1:
The binder serves as an intermediary protective layer that shields the moisture-sensitive fine particles from environmental moisture. This allows the particles to be handled and processed without requiring strict moisture control environments, significantly improving ease of operation while maintaining the high lithium ion conductivity provided by the fine particles.
Solution Approach 2:
The binder coating is applied beforehand to protect the fine particles from moisture exposure. This prior cushioning prevents moisture-related degradation before handling issues arise, allowing the material to be processed in normal atmospheric conditions while preserving the desired electrical properties.
3Reliability
If aluminum oxide or nitride is mixed with sulfide solid electrolyte raw material to increase lithium ion conductivity, then lithium ion conductivity is improved, but reactivity is poor and synthesis time increases
Solution Approach 1:
The patent changes the physical state of the raw materials by dissolving them in a solvent to form a homogeneous solution. This parameter change from solid-state mixing to solution-phase mixing dramatically improves reactivity between the aluminum oxide/nitride and sulfide components, reducing synthesis time while maintaining the lithium ion conductivity benefits.
Solution Approach 2:
The patent replaces the mechanical mixing process with a chemical solution-based approach. Instead of mechanically mixing solid powders (which has poor reactivity), the materials are dissolved and mixed in solution phase, enabling better molecular-level contact and faster reaction kinetics, thus reducing synthesis time while achieving the desired conductivity.
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 method results in a sulfide solid electrolyte composite with improved handleability and reduced deviation of fine particles, 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 and dispersing the fine particles to obtain a fine particle dispersion liquid
Implementation Method 2
removing a solvent of the fine particle dispersion liquid to obtain a composite powder of the fine particles and the sulfide solid electrolyte raw material
Data Source
AI summary
A method for producing a sulfide solid electrolyte composite includes: 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 and dispersing the fine particles to obtain a fine particle dispersion liquid; removing a solvent of the fine particle dispersion liquid to obtain a composite powder of the fine particles and the sulfide solid electrolyte raw material; and obtaining the sulfide solid electrolyte composite using the composite powder.