α-Li3PS4 Solid Electrolyte Heating for Room-Temperature Phase Stability
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Solution Overview
Problem
Existing methods struggle to maintain the α-Li3PS4 phase of L-P-S sulfide-based solid electrolytes at room temperature, which is known for its high electric conductivity.
Innovation Solution
A method involving controlled heating of Li ion conductive sulfide materials containing Li, P, and S, with or without F and Cl, at specific temperature ranges and rates to stabilize the α-Li3PS4 phase at room temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the α-Li3PS4 phase is formed through conventional heating methods, then high electric conductivity is achieved, but the phase cannot be retained at room temperature
Solution Approach 1:
The patent applies parameter changes by controlling the heating rate (100-500°C/min) and setting specific temperature ranges (230-350°C for F/Cl-free materials, 200-300°C for materials containing F and/or Cl) to transform the crystal structure from β-Li3PS4 to α-Li3PS4 phase, which can then be stabilized at room temperature through rapid cooling
Solution Approach 2:
The patent utilizes phase transitions by heating the Li ion conductive sulfide material to induce transformation from the β-Li3PS4 phase to the α-Li3PS4 phase, then rapidly cooling to retain the high-temperature α-phase at room temperature, thereby achieving both high conductivity and phase stability
2Reliability
If the heating temperature is increased to form the α-Li3PS4 phase, then electric conductivity improves, but the temperature control complexity increases
Solution Approach 1:
The patent simplifies temperature control by defining specific heating rate ranges (100-500°C/min) and temperature windows (230-350°C or 200-300°C depending on composition) that reliably produce the α-Li3PS4 phase without requiring complex multi-stage heating profiles
Solution Approach 2:
The patent applies preliminary action by adding F and/or Cl elements to the Li ion conductive sulfide material before heating, which lowers the required heating temperature range to 200-300°C and simplifies the overall temperature control process while still achieving the desired α-phase formation
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 enables the production of solid electrolyte materials with an α-Li3PS4 phase that retains excellent conductivity over time, addressing the challenge of maintaining this phase at room temperature.
Implementation Method 1
heating a Li ion conductive sulfide material containing Li, P and S but free of F and Cl and having no α-Li3PS4 phase to a temperature within a range from 230° C. to 350° C.
Implementation Method 2
a temperature increase rate at 200° C. is 100° C./min or more
Implementation Method 3
heating a Li ion conductive sulfide material containing Li, P and S as well as F and/or Cl and having no α-Li3PS4 phase to a temperature within a range from 200° C. to 300° C.
Data Source
AI summary
A subject is to provide a method for manufacturing a solid electrolyte material having an α-Li3PS4 phase. The subject is addressed by a method for manufacturing a solid electrolyte material having the α-Li3PS4 phase, comprising heating a Li ion conductive sulfide material to a temperature within a range from 230° C. to 350° C., the Li ion conductive sulfide material containing Li, P and S but free of F and Cl and having no α-Li3PS4 phase, wherein a temperature increase rate at 200° C. is 100° C./min or more.