Fluorinated Hydride Ion Conductor for Atmospheric Stability
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Solution Overview
Problem
Existing hydride ion conductors are unstable in atmospheric environments, leading to rapid decomposition and limiting their practical application in electrochemical devices.
Innovation Solution
A hydride ion conductor with a BaZnF4-type structure, represented by MAMBH4-xFx, where MA is Ca, Sr, or Ba, MB is Mg or Ca, and x is 0<x<4, exhibiting high conductivity (10−5 S/cm at 300° C) and enhanced stability through fluorine substitution, which increases the bonding force between cations and anions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing hydride ion conductors are used, then high ion conductivity can be achieved, but stability in atmospheric environment deteriorates leading to rapid decomposition
Solution Approach 1:
The patent changes the chemical composition parameters by introducing fluorine substitution (x in 0 < x ≤ 2) and optimizing the ratio of MA to MB (0.1 ≤ MA/MB ≤ 10). These parameter changes transform the material from unstable to stable in atmospheric conditions while maintaining high ion conductivity of 10^-5 S/cm or higher at 300°C
Solution Approach 2:
The patent creates a composite hydride ion conductor by combining different metal elements (MA from Ca, Sr, Ba and MB from Mg, Ca) with hydrogen and fluorine in a specific stoichiometric ratio. This composite structure MAMBH4-xFx provides both the high conductivity needed and the atmospheric stability required, resolving the contradiction between conductivity and stability
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 hydride ion conductor maintains high conductivity and stability in atmospheric conditions, allowing for longer handling and application in electrochemical devices without significant degradation, even after exposure for a week.
Implementation Method 1
fluorine substitution, which increases the bonding force between cations and anions
Implementation Method 2
Hydride ions (H−) formed of a hydrogen atom and two electrons are lighter than lithium ions and have many features, e.g., the ionic radius of the hydride ion is approximately equal to that of a fluoride ion (F−). Such hydride ions are charge carriers that are attractive from the viewpoint of electrochemistry.
Data Source
AI summary
A hydride ion conductor is represented by:MAMBH4-xFx Formula (1), whereMA is selected from the group consisting of Ca, Sr, and Ba, MB is selected from the group consisting of Mg and Ca, and is different from MA, and x is 0<x<4.