Thio-LISICON Solid Electrolyte Synthesis With Suppressed H2S Generation
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Solution Overview
Problem
Conventional methods for producing solid electrolytes face challenges in achieving high ionic conductivity due to decomposition, separation of components, and hydrogen sulfide generation, especially in high dew point environments, making it difficult to produce a solid electrolyte with practical performance.
Innovation Solution
A production method involving the mixing of raw materials containing lithium, sulfur, phosphorus, and halogen elements with a complexing agent having at least two tertiary amino groups, which forms a suspension and is then dried and heated to produce a crystalline solid electrolyte, suppressing hydrogen sulfide generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a liquid-phase method is used to dissolve solid electrolyte material in a solvent, then the solid electrolyte can be synthesized simply and in large amounts, but decomposition and breakage of solid electrolyte components occur during deposition, making it difficult to realize high ionic conductivity
Solution Approach 1:
The patent uses a complexing agent as an intermediary substance that coordinates with metal ions during the solvothermal synthesis process. This intermediary facilitates the formation of solid electrolyte crystals with controlled structure and composition, preventing decomposition while enabling scalable synthesis through the mediation of complexation reactions.
Solution Approach 2:
The patent employs solvothermal synthesis by changing temperature and pressure parameters to control the dissolution and crystallization processes. By adjusting these parameters, the method achieves high ionic conductivity solid electrolytes with controlled crystal structures while avoiding decomposition that occurs in conventional liquid-phase methods.
2Reliability
If a solid-phase method with mechanical milling treatment is used, then high purity solid electrolyte can be obtained with high ionic conductivity, but the production process is complex and less versatile
Solution Approach 1:
The patent replaces mechanical milling treatment with a chemical synthesis approach using solvothermal methods. Instead of applying mechanical force to react solids, the method uses chemical reactions in solution under controlled temperature and pressure, eliminating complex mechanical processing while achieving high purity and ionic conductivity.
Solution Approach 2:
The patent conducts synthesis in an inert atmospheric environment to prevent oxidation and contamination of the solid electrolyte components. This inert environment protection simplifies the production process by eliminating the need for complex mechanical milling operations while maintaining high purity and ionic conductivity.
3Ease of operation
If conventional methods are used in high dew point environments, then production can proceed under less restrictive conditions, but hydrogen sulfide generation occurs and practical performance is difficult to achieve
Solution Approach 1:
The patent converts the potentially harmful effect of high dew point environments into a benefit by using the moisture to facilitate hydrothermal or solvothermal synthesis reactions. The water or solvent acts as a reaction medium that promotes crystal growth and formation of high ionic conductivity solid electrolytes without generating hydrogen sulfide, transforming an adverse condition into a useful process feature.
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 achieves a solid electrolyte with high ionic conductivity and suppresses hydrogen sulfide generation, even in high dew point environments, by using a complexing agent to stabilize the electrolyte components.
Implementation Method 1
mixing a raw material inclusion containing a lithium element, a sulfur element, a phosphorus element, and a halogen element with a complexing agent containing a compound having at least two tertiary amino groups in the molecule
Implementation Method 2
which forms a suspension and is then dried and heated to produce a crystalline solid electrolyte
Implementation Method 3
dried and heated to produce a crystalline solid electrolyte
Data Source
AI summary
A solid electrolyte includes a lithium element, a sulfur element, a phosphorus element, and a halogen element. The solid electrolyte does not include P2S64− structure, and the solid electrolyte has diffraction peaks at around 2θ=20.2° and 23.6° in the X-ray diffraction pattern using a CuKα ray.