Sulfide Solid Electrolyte Microparticulation Using Ether Dispersants
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Solution Overview
Problem
Sulfide solid electrolyte materials are difficult to microparticulate due to granulation and adherence issues during pulverization, leading to low recovery rates and compromised ion conductivity, which are challenges in producing high-performance solid-state lithium batteries.
Innovation Solution
The method involves adding an ether compound as a dispersing agent to the coarse-grained sulfide solid electrolyte material during pulverization, using a media-type pulverization treatment with controlled energy to achieve microparticulation while maintaining high recovery rates and ion conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional dispersing agents are used during pulverization, then granulation and adhesion are inhibited, but ion conductivity deteriorates
Solution Approach 1:
The invention changes the chemical composition parameter of the dispersing agent from conventional options (amides, amines, esters) to ether compounds with specific molecular weight ranges (50-300 g/mol). This parameter change allows the dispersing agent to fulfill both functions: preventing granulation/adhesion during pulverization while maintaining ion conductivity through the unique properties of ether compounds that do not interfere with ionic transport.
Solution Approach 2:
The ether compound acts as an intermediary substance during pulverization. It temporarily coats the sulfide solid electrolyte particles, preventing direct contact between particles (reducing granulation) and between particles and media (reducing adhesion), while being sufficiently volatile to be removed completely after pulverization, thus not affecting the final ion conductivity of the product.
2Manufacturing precision
If media-type pulverization is used, then microparticulation is achieved, but recovery rate decreases due to adhesion to media
Solution Approach 1:
The ether compound serves as a mediator between the sulfide solid electrolyte material and the pulverization media. It forms a temporary protective layer on the particle surfaces, reducing the adhesion force between the soft sulfide particles and the media surfaces. This allows particles to be effectively pulverized and separated from the media after treatment, significantly improving recovery rate.
Solution Approach 2:
The invention changes the surface interaction parameters by introducing ether compounds with specific molecular weights. These compounds modify the surface energy and adhesion characteristics temporarily during pulverization, allowing for effective size reduction while minimizing material loss to the media. The low molecular weight ensures complete removal after processing.
3Manufacturing precision
If sulfide solid electrolyte material is pulverized, then microparticulation is achieved, but granulation occurs simultaneously
Solution Approach 1:
The ether compound acts as a spacer intermediary between adjacent sulfide particles during pulverization. It creates a physical barrier that prevents particle-to-particle contact and sintering (granulation), while being present in sufficient quantity to cover all particle surfaces. The volatile nature of the ether ensures it does not remain to cause long-term granulation issues.
Solution Approach 2:
The invention changes the inter-particle interaction parameters by introducing ether compounds. These compounds alter the surface properties and reduce the tendency for particle aggregation and granulation during the high-energy pulverization process. The specific molecular weight range ensures optimal coverage and prevention of granulation while allowing complete evaporation afterward.
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 allows for the simultaneous achievement of microparticulation, high recovery rates, and preserved ion conductivity of the sulfide solid electrolyte material, enhancing the energy density and output of batteries.
Implementation Method 1
adding an ether compound to a coarse-grained material of a sulfide solid electrolyte material and microparticulating the coarse-grained material by a pulverization treatment
Data Source
AI summary
A method for producing a sulfide solid electrolyte material includes a step of adding an ether compound to a coarse-grained material of a sulfide solid electrolyte material and microparticulating the coarse-grained material by a pulverization treatment.