Defect-Doped Oxyhalide Precursors for High-Conductivity Ionic Conductors
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Solution Overview
Problem
Traditional solid-state inorganic electrolytes face issues such as the generation of H2S gas during decomposition and formability challenges due to the hardness of oxides, limiting their effectiveness in secondary battery design.
Innovation Solution
Development of defected doped inorganic oxyhalide compounds with specific chemical compositions and crystal structures, synthesized by mixing oxides and halides of elements like Fe, Al, Sc, La, or Y, and introducing defects to enhance ionic conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional sulfide solid-state inorganic electrolytes are used, then ionic conductivity can be achieved, but H2S gas is generated during decomposition
Solution Approach 1:
The patent changes the chemical composition parameters by replacing traditional sulfide electrolytes with oxyhalide compounds containing F, Cl, Br, or I anions. This compositional parameter change eliminates H2S gas generation while maintaining high ionic conductivity through the unique defect-doped crystal structure of the oxyhalide compounds
Solution Approach 2:
The patent employs composite material design by creating defect-doped oxyhalide compounds with specific crystal structures. The composite nature of the material system, combining metal cations (M) with oxyhalide anions in a defect-doped configuration, achieves both high ionic conductivity and chemical stability without H2S evolution
2Strength
If traditional oxide solid-state inorganic electrolytes are used, then mechanical stability is improved, but formability deteriorates due to hardness
Solution Approach 1:
The patent changes the material composition from traditional oxides to oxyhalide compounds, altering the chemical and physical parameters. This parameter change results in a material that maintains mechanical stability while significantly improving formability, allowing for easier fabrication of solid-state electrolyte components
Solution Approach 2:
The patent applies local quality modification through defect doping in specific crystallographic positions of the oxyhalide structure. By introducing controlled defects at specific lattice sites, the material achieves optimized mechanical properties and formability while maintaining overall structural 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 defect doped inorganic oxyhalide compounds exhibit significantly improved cationic conductivity, surpassing traditional electrolytes by more than two orders of magnitude, making them suitable for advanced battery applications.
Implementation Method 1
the defect doped inorganic precursor exhibits significantly improved cationic conductivity, surpassing traditional electrolytes by more than two orders of magnitude
Implementation Method 2
the defect doped inorganic precursor includes or has a crystal structure that reflects or exhibits x-ray diffraction peaks with a 2θ between about 63.3° and about 65.3°, and between about 76.6° and about 78.6°
Data Source
AI summary
A method of synthesizing an inorganic precursor for an ionic conductor includes mixing at least one oxide of M with at least one halide of M, heating the mixture of the at least one oxide of M and the at least one halide of M and forming an MOX inorganic oxyhalide compound, and injecting defects in the MOX inorganic oxyhalide compound and forming a defect doped (MOX)′ precursor for an ionic conductor. The element or component M is selected from at least one of Fe, Al, La, and Y, the at least one halide of M is selected from at least one of a fluoride of M, a chloride of M, a bromide of M, and an iodide of M, and the element or component X is at least one of F, Cl, Br, and I.