Li-Zr-Y-Cl-O Solid Electrolyte for Safe High-Conductivity Batteries
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Solution Overview
Problem
Existing solid electrolyte materials, such as sulfide solid electrolytes, pose safety concerns due to the potential generation of hydrogen sulfide when exposed to the atmosphere, and they often have limited lithium ion conductivity, which affects the performance of all-solid-state batteries.
Innovation Solution
A new solid electrolyte material composed of Li, Zr, Y, Cl, and O, with a specific molar ratio of O to Y greater than 0 and less than or equal to 0.60, is developed, which enhances lithium ion conductivity and is free from sulfur, thereby improving safety and charge/discharge characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sulfide solid electrolyte is used, then the battery can operate, but hydrogen sulfide is generated when exposed to atmosphere causing safety concerns
Solution Approach 1:
The patent changes the chemical composition parameters of the solid electrolyte by replacing sulfide-based materials with a chloride-containing material having specific molar ratios (0.95≤x≤1.05, 0.90≤y≤1.10, 0.85≤z≤1.15 in LixZryClzO). This compositional parameter change eliminates hydrogen sulfide generation while maintaining ionic conductivity, directly resolving the safety contradiction.
Solution Approach 2:
The patent employs a composite material system LixZryClzO that combines multiple elements (Li, Zr, Cl, O) in specific proportions to create a new class of solid electrolyte. This composite approach achieves both high ionic conductivity and chemical stability against moisture, eliminating the harmful hydrogen sulfide generation inherent in sulfide-based electrolytes.
2Reliability
If conventional solid electrolyte materials are used, then the battery structure is simple, but lithium ion conductivity is limited affecting battery performance
Solution Approach 1:
The patent optimizes the stoichiometric parameters of the Li-Zr-Cl-O system within specific ranges (x: 0.95-1.05, y: 0.90-1.10, z: 0.85-1.15) to achieve peak lithium ion conductivity. This parameter optimization enables the material to attain conductivity levels comparable to or exceeding conventional electrolytes, resolving the performance limitation while maintaining compositional simplicity.
3Reliability
If the molar ratio of O to Y is not controlled, then the material synthesis is simpler, but the lithium ion conductivity and charge/discharge characteristics are poor
Solution Approach 1:
The patent establishes the critical parameter constraint that the molar ratio of O to Y must be 0.60 or less to achieve optimal lithium ion conductivity and charge/discharge characteristics. This precise parameter specification ensures high-performance battery operation while providing clear manufacturing guidance for achieving the desired material properties.
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 (≥2.5×10−4 S/cm) and is safe from hydrogen sulfide generation, enabling excellent charge and discharge performance in all-solid-state batteries.
Implementation Method 1
practical lithium ion conductivity, such as a high lithium ion conductivity. Here, a high lithium ion conductivity is, for example, greater than or equal to 2.5×10−4 S/cm
Data Source
AI summary
A solid electrolyte material of the present disclosure includes Li, Zr, Y, Cl, and O, wherein the molar ratio of O to Y is greater than 0 and less than or equal to 0.60. 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.