Argyrodite Sulfide Electrolyte Processing with Elemental Phosphorus
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Solution Overview
Problem
The use of diphosphorus pentasulfide in producing argyrodite-type solid electrolytes is unstable against moisture, requiring careful handling and resulting in low ionic conductivity when elemental phosphorus is used as a substitute, leading to compositional deviations and decreased conductivity.
Innovation Solution
A method involving the mixing of elemental phosphorus with other compounds at a specific energy level, followed by heat treatment between 350 to 500°C, to form a precursor containing P2S64− glass, which suppresses compositional deviations and enhances ionic conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If diphosphorus pentasulfide is used as a raw material, then the production process can proceed, but it is unstable against moisture and requires careful handling
Solution Approach 1:
The patent replaces unstable diphosphorus pentasulfide with stable elemental phosphorus as a raw material. Elemental phosphorus is more stable against moisture and easier to handle during transportation and storage, while still enabling the production of argyrodite-type solid electrolytes through the specified mixing and heat treatment process
2Reliability
If elemental phosphorus is used as a raw material, then handling stability is improved, but ionic conductivity becomes low
Solution Approach 1:
The patent specifies precise mixing parameters (integrated power of 0.5 kwh/kg or more) and heat treatment temperature range (350 to 500°C) to transform elemental phosphorus into the desired crystal structure. These parameter changes ensure that the stable elemental phosphorus can produce argyrodite-type solid electrolyte with high ionic conductivity (9 mS/cm or more)
Solution Approach 2:
The patent creates a composite precursor containing P2S6 4- glass through the mixing and heat treatment of elemental phosphorus with other raw materials. This composite structure enables both the stability of elemental phosphorus and the high ionic conductivity required for battery applications
3Ease of operation
If elemental phosphorus is used without specific mixing conditions, then handling is easier, but compositional deviations occur and conductivity decreases
Solution Approach 1:
The patent specifies that elemental phosphorus must be mixed at an integrated power of 0.5 kwh/kg or more to achieve uniform distribution and prevent compositional deviations. This parameter control ensures that the ease of handling elemental phosphorus does not compromise the compositional uniformity of the final product
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 allows for the production of argyrodite-type solid electrolytes with high ionic conductivity, suitable for lithium-ion batteries, achieving conductivities of 9 mS/cm or more without the handling challenges of diphosphorus pentasulfide.
Implementation Method 1
heat-treating the precursor obtained in the mixing at 350 to 500° C.
Implementation Method 2
mixing a raw material containing elemental phosphorus to obtain a precursor containing P2S6 4- glass
Implementation Method 3
By crystallizing the precursor obtained by mixing at a predetermined energy amount or more with heat treatment, the ionic conductivity of the finally produced argyrodite-type solid electrolyte is increased
Data Source
AI summary
A method for producing a sulfide solid electrolyte having an argyrodite-type crystal structure may involve: mixing a raw material containing elemental phosphorus at an integrated power of 0.5 kWh/kg or more, and heat-treating a precursor obtained in the mixing at 350 to 500° C.