Room-Temperature Solid Electrolyte Synthesis via Mechanochemical Milling
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Solution Overview
Problem
Current solid electrolytes for all-solid-state batteries require advanced synthesis conditions and expensive precursors, making them difficult and costly to produce on an industrial scale, and are often thermally and electrochemically unstable.
Innovation Solution
Development of mixed-anion compounds and composites, such as Li3+x+yM1−xNxO4Qy, using cost-effective room-temperature methods and readily available precursors, with high-energy mechanochemical ball milling and electrochemical cycling to achieve high ionic conductivity, exemplified by the Li3PO4-LiI composite.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If advanced synthesis conditions and expensive precursors are used to produce solid electrolytes, then high ionic conductivity is achieved, but production cost and manufacturing complexity increase
Solution Approach 1:
The patent changes the synthesis temperature parameter from high (>1100°C) to low (room temperature), enabling cost-effective production while maintaining high ionic conductivity through the discovery of metastable phases that form under mild conditions
Solution Approach 2:
The patent replaces expensive precursors with readily available, low-cost materials such as Li3PO4 and LiI, achieving high ionic conductivity through simple mixing and ball-milling rather than complex synthesis procedures
2Manufacturing precision
If high sintering temperatures are used to produce solid electrolytes, then material density is improved, but energy consumption and production cost increase
Solution Approach 1:
The patent fundamentally changes the temperature parameter from high (>1100°C sintering) to low (room temperature processing), achieving adequate material density through mechanical ball-milling and metastable phase formation without high energy input
Solution Approach 2:
The patent replaces thermal processing (sintering) with mechanical processing (ball-milling) to achieve material densification and phase formation, substituting heat energy with mechanical energy for more efficient production
3Manufacturing precision
If complex synthesis techniques are used to produce solid electrolytes, then material purity is improved, but device complexity and production difficulty increase
Solution Approach 1:
The patent segments the synthesis process into simple, discrete steps: mixing precursors, ball-milling for 24 hours, and electrochemical cycling, replacing complex multi-step synthesis with a straightforward sequential process
Solution Approach 2:
The patent employs electrochemical cycling to automatically optimize and purify the metastable phase in situ, allowing the material to self-correct and improve its properties through simple charge-discharge cycles without additional processing steps
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 approach enables the production of metastable solid electrolytes with ionic conductivities up to 0.15 mS/cm, facilitating the creation of cost-effective, stable, and efficient solid-state lithium-ion batteries.
Implementation Method 1
high-energy mechanochemical ball milling is employed to initiate the formation of the compounds or composites
Implementation Method 2
Electrochemical cycling may be used to facilitate or optimize the formation of a metastable phase
Data Source
AI summary
Compounds, composites including compounds, and devices including the compounds. The compounds may be electrolytes used in devices, such as solid-state batteries. Methods for preparing compounds and composites. The methods may be performed in mild conditions, such as at room temperature.