Lithium Argyrodite Solution Synthesis for Morphology Control
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Solution Overview
Problem
Current methods for preparing lithium argyrodite sulfide-based solid electrolytes are inefficient and lack control over morphology, requiring complex steps and pre-formed compounds, which hinders the development of advanced lithium batteries with improved safety and performance.
Innovation Solution
A method involving the preparation of a homogeneous solution at low temperatures, using lithium sulfide, phosphorus sulfide, and a halogen compound in a solvent, followed by solvent removal and optional thermal treatment, to produce lithium argyrodite (Li6PS5X) with controlled morphology and improved productivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional dry or wet mechanochemical routes are used to prepare lithium argyrodite, then the synthesis can be achieved, but the process is complex and lacks control over product morphology
Solution Approach 1:
The invention changes the physical state parameter of the reactants from solid (mechanochemical route) to solution phase (wet chemical route), enabling better control over reaction conditions and product morphology through solution chemistry parameters such as concentration, temperature, and pH
Solution Approach 2:
The invention introduces an intermediary solution phase between the reactants, using solvents and intermediates to facilitate controlled reaction and precipitation, which allows for morphology control while simplifying the overall manufacturing process
2Productivity
If pre-formed Li3PS4 is used as starting material, then the synthesis can proceed, but the process requires multiple steps and pre-formed compounds
Solution Approach 1:
The invention merges multiple synthesis steps into a single one-pot reaction by combining all reactants (Li2S, P2S5, and halogen compound) in solution simultaneously, eliminating the need for pre-formed intermediates and reducing the number of process steps
Solution Approach 2:
The invention performs preliminary dissolution of all reactants in solution before the actual reaction, which simplifies the subsequent synthesis step and increases overall productivity by avoiding multiple isolation and re-dissolution cycles
3Strength
If high temperature sintering is used to attach electrolyte to electrodes, then good contact is achieved, but lithium metal anodes cannot be used due to temperature constraints
Solution Approach 1:
The invention utilizes phase transition from solution to solid during solvent evaporation to achieve strong bonding between electrolyte and electrodes at low temperatures, replacing the need for high temperature sintering and enabling compatibility with lithium metal anodes
Solution Approach 2:
The invention replaces the thermal field (high temperature sintering) with a chemical field (solution-based synthesis and evaporation), achieving equivalent or superior bonding strength while enabling the use of temperature-sensitive lithium metal anodes
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 simplifies the production of lithium argyrodite, allowing for better control over the product's morphology and increasing productivity, thereby enhancing the performance and safety of lithium batteries by using a more efficient and easier-to-implement process.
Implementation Method 1
a method for the synthesis of a sulfide-based solid electrolyte with argyrodite structure... comprising at least one step for the preparation of a solution S1 at a temperature T1 comprised from -200°C to 10°C, preferably from -110°C to 0°C, said solution S1 comprising a solvent and at least P species under the form of (PS 4 ) 3-
Implementation Method 2
The solution is then concentrated and the solvent is eliminated. Li 6 PS 5 X is then obtained as a solid, preferably as a powder
Data Source
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AI summary
The present invention concerns a new method for the preparation of lithium argyrodite, as well as the products obtainable by said methods, and uses thereof especially as solid electrolytes.