Halide Solid Electrolyte for Battery Safety
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Solution Overview
Problem
Existing solid electrolyte materials for batteries often suffer from low lithium-ion conductivity and safety issues due to the generation of hydrogen sulfide, which can lead to safety hazards and inefficient charge/discharge characteristics.
Innovation Solution
A solid electrolyte material composed of Li, Y, and at least one selected from Mg, Ca, Sr, Ba, Zn, Zr, or Ta, combined with Cl, Br, or I, exhibiting specific X-ray diffraction patterns and crystal structures that enhance lithium-ion conductivity and prevent hydrogen sulfide generation, thereby ensuring high safety and efficient charge/discharge performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sulfide solid electrolyte materials are used in batteries, then the battery structure can be established, but hydrogen sulfide is generated causing safety hazards and low reliability
Solution Approach 1:
The patent changes the chemical composition parameters of the solid electrolyte by substituting sulfur with halide elements (Cl, Br, I) in the Li-Y-M-X compound structure. This parameter change eliminates the hydrogen sulfide generation issue while maintaining the solid electrolyte functionality, directly resolving the safety contradiction.
Solution Approach 2:
The patent creates a composite solid electrolyte material combining Li, Y, M (Mg, Ca, Sr, Ba, Zn, Zr, Nb, or Ta), and halide elements (Cl, Br, or I). This composite material approach replaces the problematic sulfide-based electrolyte with a halide-based composite that maintains structural integrity while eliminating harmful hydrogen sulfide generation.
2Productivity
If conventional solid electrolyte materials are used, then the battery can operate, but lithium-ion conductivity is low resulting in poor charge/discharge characteristics
Solution Approach 1:
The patent optimizes the compositional parameters of the solid electrolyte by carefully selecting the ratios of Li, Y, M, and halide elements, along with controlling synthesis parameters like temperature and atmosphere. These parameter changes enhance lithium-ion conductivity to achieve efficient charge/discharge characteristics while maintaining battery operability.
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 proposed solid electrolyte material achieves high lithium-ion conductivity and safe operation by preventing hydrogen sulfide generation, leading to improved charge/discharge characteristics and enhanced battery performance.
Implementation Method 1
a solid electrolyte material having a high lithium-ion conductivity
Implementation Method 2
An X-ray diffraction pattern of the solid electrolyte material obtained using Cu—Kα radiation as an X-ray source includes peaks
Data Source
AI summary
A solid electrolyte material contains Li; Y; at least one selected from the group consisting of Mg, Ca, Sr, Ba, Zn, Zr, Nb, and Ta; and at least one selected from the group consisting of Cl, Br, and I. An X-ray diffraction pattern of the solid electrolyte material obtained using Cu—Kα radiation as an X-ray source includes peaks in a range of diffraction angles 2θ of 30° or more and 33° or less, in a range of diffraction angles 2θ of 39° or more and 43° or less, and in a range of diffraction angles 2θ of 47° or more and 51° or less.