Composite Fluoride Electrolyte for Low-Temperature Ion Conduction
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Solution Overview
Problem
Fluoride ion batteries face low ion conductivity at low temperatures, limiting their operational effectiveness due to the low ion conductivity of solid electrolytes.
Innovation Solution
A solid electrolyte material with a metal composite fluoride structure, including a fluorite structure with lanthanoid metal ions, alkali earth metal ions, and adduct ions, where the adduct ion has a larger ion radius than the alkali earth metal ion, and a specific mole ratio, enhancing ion conductivity by increasing the lattice constant and facilitating fluoride ion conduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a solid electrolyte material with fluorite structure is used in fluoride ion batteries, then high energy density and high voltage are achieved, but ion conductivity becomes low at low temperatures
Solution Approach 1:
The invention changes the compositional parameters of the solid electrolyte by introducing adduct ions with larger ionic radii than alkali earth metal ions into the fluorite structure. This parameter change increases the lattice constant and creates larger ion conduction pathways, enabling the material to maintain high ion conductivity at low temperatures while preserving the high energy density characteristics of fluoride ion batteries
Solution Approach 2:
The invention creates a composite solid electrolyte material by combining multiple elements (lanthanoid metals, alkali earth metals, and adduct ions) within the fluorite structure. This composite approach allows the material to exhibit both high energy density from the fluoride ion battery system and high ion conductivity at low temperatures through the synergistic effects of the different ionic components
2Reliability
If the lattice constant of the fluorite structure is increased to improve ion conductivity, then fluoride ion conduction is facilitated, but the structural stability may be compromised
Solution Approach 1:
The invention applies local quality by strategically selecting specific adduct ions with larger ionic radii to occupy specific lattice positions within the fluorite structure. This localized modification increases the lattice constant and improves ion conductivity in the conduction pathways while maintaining the overall structural stability through the preserved fluorite framework and appropriate compositional ratios
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 proposed solid electrolyte material achieves high ion conductivity for fluoride ions, enabling fluoride ion batteries to function effectively at relatively low temperatures by improving the conduction mechanism through the inclusion of adduct ions in the fluorite structure.
Implementation Method 1
a solid electrolyte material for fluoride ion batteries that has high ion conductivity for fluoride ions
Data Source
AI summary
Provided is a solid electrolyte material for fluoride ion batteries which has high fluoride ion conductivity. The solid electrolyte material for fluoride ion batteries includes a metal composite fluoride that includes, as its main phase, a crystal structure containing, in a fluorite structure containing a fluoride ion, a lanthanoid metal ion, and an alkali earth metal ion, an adduct ion having an ion radius larger than that of the alkali earth metal ion. The metal composite fluoride has a composition in which a ratio of a number of moles of the fluoride ion to a total number of moles of the lanthanoid metal ion, the alkali earth metal ion, and the adduct ion is greater than 1.87 and is smaller than 3, and a ratio of a number of moles of the adduct ion to a number of moles of the alkali earth metal ion is smaller than 1.