Inorganic Oxychloride Solid Electrolytes for Stable Battery Design
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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 problems due to the hardness of oxides, which affect their stability and usability in secondary battery design.
Innovation Solution
Development of an inorganic oxychloride compound with a chemical composition of (Fe1-xMx)O1-y(OH)yCl1-x, where M is Mg or Ca, and x and y are within specific ranges, exhibiting enhanced thermal stability and unique XRD peaks, synthesized through a method involving mixing chloride-containing reagents, dissolution, and heating to form particles with improved properties.
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 reducing safety and stability
Solution Approach 1:
The patent changes the chemical composition parameters by introducing oxychloride compounds with specific stoichiometric ratios (Fe1-xMx)O1-y(OH)yCl1-x, where M is Mg or Ca. This compositional modification shifts the decomposition behavior from generating H2S gas to releasing HCl gas, thereby improving safety while maintaining ionic conductivity.
Solution Approach 2:
The invention uses composite inorganic oxychloride materials combining Fe, Mg/Ca, O, OH, and Cl elements in specific ratios. This composite structure integrates the advantages of sulfide (high ionic conductivity) and oxide (thermal stability) while avoiding their respective disadvantages (H2S generation and hardness).
2Temperature
If traditional oxide solid-state inorganic electrolytes are used, then thermal stability is improved, but formability deteriorates due to hardness of the oxide
Solution Approach 1:
The patent modifies the material's chemical composition by incorporating chloride and hydroxide components into the oxide structure, creating oxychloride compounds. This compositional change reduces the material's hardness while maintaining thermal stability, enabling better formability and ease of manufacture.
Solution Approach 2:
The invention introduces dopant elements (Mg or Ca) at specific positions in the crystal structure (indicated by parameter x in Fe1-xMx), creating local structural modifications that reduce hardness and improve formability while preserving the overall thermal stability provided by the oxide framework.
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 resulting inorganic oxychloride compound demonstrates increased thermal stability and ionic conductivity when incorporated into lithium-doped solid-state electrolytes, outperforming traditional electrolytes in terms of cationic conductivity and thermal decomposition temperature.
Implementation Method 1
increased thermal stability and ionic conductivity when incorporated into lithium-doped solid-state electrolytes
Implementation Method 2
thermal decomposition start temperature of about 410° C.
Data Source
AI summary
An ionic conductor includes an inorganic oxychloride compound with a chemical composition of (Fe1-xMx)O1-y(OH)yCl1-x where M is selected from at least one of Mg and Ca, and x is greater than 0 and less than or equal to 0.25, y is greater than or equal to 0 and less than or equal to 0.25. The inorganic oxychloride compound has a thermal decomposition start temperature of about 410° C. and x-ray diffraction peaks (2θ) between about 20.79° and about 22.79°, between about 30.03° and about 32.03°, between about 39.47° and about 41.47°, and between about 76.44° and about 78.44°.