Li-Yb Halide Solid Electrolyte for H2S-Free Battery Ion Transport
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Solution Overview
Problem
Existing solid electrolyte materials, such as sulfide-based ones, pose safety concerns due to hydrogen sulfide generation when exposed to air, and they often have limited lithium ion conductivity, which affects the performance of all-solid-state batteries.
Innovation Solution
A novel solid electrolyte material composed of Li, Yb, and at least two elements from F, Cl, Br, and I, with a specific compositional formula (Li6-3aYbaCl6-x-y-zBrxIyFz) that exhibits high lithium ion conductivity and does not contain sulfur, thereby avoiding hydrogen sulfide generation and enhancing safety and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sulfide-based solid electrolyte materials are used, then ionic conductivity can be achieved, but hydrogen sulfide is generated when exposed to air causing safety concerns
Solution Approach 1:
The patent changes the chemical composition parameters by replacing sulfur-based electrolytes with halide-based electrolytes containing Li, Yb, and multiple halogens (F, Cl, Br, I). This compositional parameter change eliminates hydrogen sulfide generation while maintaining ionic conductivity through the new halide chemistry system
Solution Approach 2:
The patent employs composite material strategy by creating a multi-element halide system (Li-Yb-X where X includes at least two of F, Cl, Br, I) that combines the advantages of different halogen elements to achieve both high ionic conductivity and chemical stability against moisture, thereby preventing hydrogen sulfide generation
2Productivity
If conventional solid electrolyte materials are used, then battery operation is possible, but lithium ion conductivity is limited affecting battery performance
Solution Approach 1:
The patent optimizes ionic conductivity by carefully adjusting compositional parameters (ratios of Li, Yb, and halogen elements) and structural parameters (crystal phase composition) to create a material system with enhanced lithium ion transport properties, achieving conductivity ≥5.0×10−5 S/cm near room temperature
Solution Approach 2:
The patent creates specific local structural environments within the crystal lattice that favor lithium ion conduction, by controlling the arrangement and coordination of Yb and halogen atoms around lithium ions, thereby enhancing ionic conductivity in specific conduction pathways 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 material achieves high lithium ion conductivity (≥5.0×10−5 S/cm near room temperature) and excellent charge-discharge characteristics, making it suitable for advanced all-solid-state batteries with improved safety and efficiency.
Implementation Method 1
the solid electrolyte material according to the first embodiment may have practical lithium ion conductivity and may have, for example high lithium ion conductivity. Here, the high lithium ion conductivity is, for example, greater than or equal to 5.0×10−5 S/cm near room temperature
Data Source
AI summary
A solid electrolyte material of the present disclosure contains Li, Yb, and X. X is at least two selected from the group consisting of F, Cl, Br, and I. A battery of the present disclosure includes a positive electrode, a negative electrode, and an electrolyte layer disposed between the positive electrode and the negative electrode. At least one selected from the group consisting of the positive electrode, the negative electrode, and the electrolyte layer contains the solid electrolyte material of the present disclosure.