Lithium Sulfide Powder Synthesis Without Hydrogen Sulfide Gas
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Solution Overview
Problem
Current methods for producing lithium sulfide (Li2S) rely on toxic hydrogen sulfide (H2S) gas, which poses safety and environmental concerns, and are not efficient.
Innovation Solution
A method involving a mechanochemical reaction using a mixed powder of inorganic lithium compounds, metal reducing agents, and sulfur, processed at room temperature in an inert atmosphere, followed by solvent mixing and oxide removal through precipitation, centrifugation, and heat treatment to produce lithium sulfide powder without using hydrogen sulfide.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional methods using hydrogen sulfide gas are employed to produce lithium sulfide, then lithium sulfide can be synthesized, but toxic H2S gas is used which poses safety and environmental concerns
Solution Approach 1:
The patent extracts and removes the toxic hydrogen sulfide gas component from the synthesis process entirely. Instead of using H2S gas to react with lithium compounds, the invention uses alternative lithium sources (lithium hydroxide, lithium carbonate, or lithium oxide) combined with sulfur and metal reducing agents, thereby eliminating the harmful substance while maintaining the production of lithium sulfide
Solution Approach 2:
The patent converts the harmful toxic H2S gas pathway into a beneficial alternative route by using metal reducing agents (such as magnesium, aluminum, or silicon) that react with sulfur and lithium compounds to produce lithium sulfide without generating toxic gases. The metal reducing agents serve as safe substitutes that transform the harmful chemical pathway into a safe one
2Productivity
If conventional high temperature heating methods are used to produce lithium sulfide, then lithium sulfide can be synthesized, but the process is not efficient and requires high energy input
Solution Approach 1:
The patent replaces the thermal/mechanical heating system with a chemical reduction system. Instead of relying on high temperature heating to drive the reaction, the invention uses metal reducing agents that chemically reduce lithium compounds to lithium sulfide at lower temperatures, thereby substituting thermal energy input with chemical reaction energy
Solution Approach 2:
The patent changes the reaction parameters from high temperature conditions to lower temperature conditions by introducing metal reducing agents. The use of metals such as magnesium, aluminum, or silicon alters the reaction pathway to proceed at milder conditions, improving energy efficiency and productivity
3Reliability
If lithium sulfide is produced through conventional methods, then lithium sulfide can be obtained, but the process requires toxic reagents and high temperature
Solution Approach 1:
The patent extracts and eliminates the high temperature requirement from the conventional process by introducing metal reducing agents that enable the reaction to proceed at lower temperatures. This removal of the high temperature parameter improves safety and reliability of the production process
Solution Approach 2:
The patent converts the harmful high temperature condition into a beneficial low temperature process by using metal reducing agents. The metals provide an alternative reaction pathway that is both safer and more energy-efficient, transforming the harmful thermal process into a beneficial chemical reduction process
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 enables the production of high-purity lithium sulfide powder at room temperature, avoiding the use of toxic hydrogen sulfide and achieving efficient synthesis and separation of lithium sulfide from metal oxides.
Implementation Method 1
preparing a starting material including a metal oxide by subjecting a mixed powder including an inorganic compound containing lithium and oxygen, a metal reducing agent, and sulfur (S) to synthesis reaction
Implementation Method 2
subjecting a mixed powder including an inorganic compound containing lithium and oxygen, a metal reducing agent, and sulfur (S) to synthesis reaction using mechanical force
Implementation Method 3
preparing a mixed solution by mixing the starting material and a solvent
Implementation Method 4
obtaining a lithium sulfide (Li2S) powder by removing the metal oxide from the mixed solution and then performing drying
Implementation Method 5
obtaining a lithium sulfide (Li2S) powder by removing the metal oxide from the mixed solution
Implementation Method 6
obtaining a lithium sulfide (Li2S) powder by removing the metal oxide from the mixed solution and then performing drying
Data Source
AI summary
Disclosed is a method of producing lithium sulfide (Li2S) without using hydrogen sulfide (H2S) gas. Particularly, the method of producing lithium sulfide (Li2S) includes preparing a starting material including a metal oxide by subjecting a mixed powder including an inorganic compound containing lithium and oxygen, a metal reducing agent, and sulfur (S) to synthesis reaction using mechanical force, preparing a mixed solution by mixing the starting material and a solvent, and obtaining a lithium sulfide (Li2S) powder by removing the metal oxide from the mixed solution and then performing drying.