Li-Sm-O Halide Solid Electrolyte for H2S-Free Battery Conduction
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Solution Overview
Problem
Existing solid electrolyte materials, such as sulfide solid electrolytes, pose safety concerns due to the generation of hydrogen sulfide when exposed to air, and they do not offer high lithium ion conductivity, which limits their performance in batteries.
Innovation Solution
A solid electrolyte material composed of Li, Sm, O, and X (where X is Cl, Br, or I) is developed, with a specific composition (Li2+b−3a(Sm1−xMx)aOXb) that enhances lithium ion conductivity and avoids sulfur, ensuring safety by preventing hydrogen sulfide generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sulfide solid electrolyte materials are used, then the battery can be constructed with solid electrolyte components, 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, Sm, O, and X (Cl, Br, or I). This compositional parameter change eliminates the source of hydrogen sulfide generation while maintaining solid electrolyte functionality, directly resolving the safety contradiction.
Solution Approach 2:
The patent employs a composite halide solid electrolyte material combining multiple elements (Li, Sm, O, and halogen X) in specific ratios defined by parameters a, b, and x. This composite material approach creates a new class of solid electrolytes that provide both safety (no H2S generation) and high ionic conductivity, simultaneously addressing the safety concern.
2Reliability
If conventional solid electrolyte materials are used, then the battery structure can be maintained, but lithium ion conductivity is insufficient limiting performance
Solution Approach 1:
The patent optimizes lithium ion conductivity by precisely controlling compositional parameters (a, b, x) in the formula Li2+b−3a(Sm1−xMx)aOXb. By adjusting these parameters within specific ranges, the material achieves high lithium ion conductivity, directly resolving the contradiction between maintaining battery structure and improving conductivity for better performance.
Solution Approach 2:
The patent introduces local compositional variations through the parameter x (representing substitution of Sm with other rare earth elements M) and the stoichiometric parameters a and b. This local quality adjustment allows optimization of ionic conductivity pathways while maintaining overall material stability, enabling high performance without compromising structural integrity.
3Ease of manufacture
If sulfur-containing solid electrolytes are used, then solid state battery construction is achieved, but the material generates harmful hydrogen sulfide gas upon air exposure
Solution Approach 1:
The patent extracts and removes sulfur from the solid electrolyte composition, replacing it with halide elements (Cl, Br, or I). This extraction of the harmful sulfur component eliminates hydrogen sulfide generation upon air exposure while preserving the solid electrolyte's essential functions for battery construction, resolving the contradiction between ease of manufacture and safety.
Solution Approach 2:
The patent converts the potential harm of sulfur-based electrolytes (H2S generation) into a benefit by developing halide-based electrolytes that not only eliminate H2S generation but also provide high lithium ion conductivity and air stability. The replacement of sulfur with halides transforms a harmful system into a safe and high-performance system, simultaneously achieving ease of manufacture and safety.
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 new solid electrolyte material achieves high lithium ion conductivity and excellent charge-discharge characteristics, improving the safety and performance of batteries by eliminating sulfur and optimizing the composition for enhanced ionic conductivity.
Implementation Method 1
a solid electrolyte material containing Li, Sm, O, and X, where X is at least one element selected from the group consisting of Cl, Br, and I The solid electrolyte material according to the first embodiment has high lithium ion conductivity
Data Source
AI summary
The present disclosure provides a solid electrolyte material having high lithium ion conductivity. A solid electrolyte according to the present disclosure contains Li, Sm, O, and X. X is at least one element selected from the group consisting of Cl, Br, and I.