Tysonite Solid Electrolyte for Low-Temperature Fluoride Ion Conduction
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Solution Overview
Problem
Conventional fluoride ion batteries face difficulties in functioning at low temperatures due to low fluoride ion conductivity of solid electrolytes, which limits their performance.
Innovation Solution
A solid electrolyte material with a Tysonite structure and CsF content of 50% by weight or less is used, enhancing fluoride ion conductivity at relatively low temperatures by improving grain boundary conduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional solid electrolyte materials are used, then the battery can function at high temperatures, but the fluoride ion conductivity is low at low temperatures
Solution Approach 1:
The patent uses a composite solid electrolyte material consisting of a Tysonite structure phase (La1-xMxF3-x) and a fluorite structure phase (Y1-yF2-y). This composite structure combines the advantages of both phases: the Tysonite phase provides structural stability while the fluorite phase contributes high fluoride ion conductivity, enabling the battery to function reliably at low temperatures without sacrificing high-temperature performance
Solution Approach 2:
The patent optimizes the compositional parameters of the solid electrolyte by controlling the substitution amount x in the La1-xMxF3-x formula and the fluorite phase composition Y1-yF2-y. By adjusting these parameters, the material achieves optimal fluoride ion conductivity at low temperatures while maintaining structural stability across a wide temperature range
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 solution achieves excellent fluoride ion conductivity at approximately 80°C, improving battery performance at low temperatures without the need for high-temperature processing, thus overcoming the limitations of existing technologies.
Implementation Method 1
the fluoride ion conductivity of the solid electrolyte is low in the condition at a low temperature
Data Source
AI summary
An object of the present disclosure is to provide a solid electrolyte material with excellent ion conductivity at a low temperature. The present disclosure achieves the object by providing a solid electrolyte material to be used for a fluoride ion battery, the solid electrolyte material comprising: a solid electrolyte particle including a crystal phase, that has a Tysonite structure and contains an F element, as a main phase; and CsF; and the CsF content in the solid electrolyte material is 50% by weight or less.