Oxyhalide Li-Ion Conductors for Stable Solid-State Electrolytes
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Solution Overview
Problem
Traditional solid-state inorganic electrolytes face issues such as H2S gas generation during decomposition and formability problems due to hardness, limiting their effectiveness in secondary battery design.
Innovation Solution
Development of inorganic oxyhalide compounds with chemical compositions like MOX, where M is Fe, Al, Sc, La, or Y, and X is F, Cl, or I, which exhibit improved thermal stability and ionic conductivity, synthesized by mixing oxides and halides of these elements and heating them to form a stable oxyhalide compound.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional sulfide solid-state inorganic electrolytes are used, then ionic conductivity is achieved, but H2S gas is generated during decomposition
Solution Approach 1:
The patent changes the chemical composition parameters by introducing oxyhalide compounds (MOX where M is Fe, Al, Sc, La, or Y and X is F, Cl, Br, or I) instead of traditional sulfide or oxide electrolytes. This compositional parameter change eliminates H2S gas generation while maintaining ionic conductivity through the unique oxyhalide structure.
Solution Approach 2:
The patent employs composite oxyhalide materials combining metal oxides and metal halides in a specific chemical structure (MOX). This composite approach creates a new class of electrolyte that integrates the benefits of both oxide and halide compounds, achieving high ionic conductivity without the harmful decomposition products of sulfide electrolytes.
2Strength
If traditional oxide solid-state inorganic electrolytes are used, then mechanical stability is achieved, but formability deteriorates due to hardness
Solution Approach 1:
The patent changes the material composition from traditional oxides to oxyhalide compounds (MOX). This parameter change modifies the mechanical properties, reducing hardness and improving formability while retaining mechanical stability, enabling easier manufacturing of solid-state electrolyte components.
3Stability of the object's composition
If oxyhalide compounds with higher thermal stability are used, then thermal decomposition resistance is improved, but synthesis complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-mixing the oxide and halide components in precise stoichiometric ratios before heating. This preliminary preparation step simplifies the overall synthesis process for high-thermal-stability oxyhalide compounds, making the manufacturing process more controllable and less complex despite the high thermal stability requirements.
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 oxyhalide compounds demonstrate enhanced thermal stability and ionic conductivity, addressing the limitations of traditional electrolytes by providing a more stable and efficient Li-ion conductor without compromising conductivity.
Implementation Method 1
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
Data Source
AI summary
An inorganic compound for a Li-ion conductor includes an oxyhalide compound with a chemical composition of MOX where M is at least one of Al, Sc, La, and Y, and X is at least one of F, Cl, Br, and I. Also, the oxyhalide compound has a thermal decomposition start temperature of the oxyhalide compound is greater than a thermal decomposition start temperature of FeOCl and a conductivity that is general equal to or greater than a conductivity of the FeOCl.