Oxide-Based Solid Electrolyte Composition for Safe Li-Ion Conduction
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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 lack optimal lithium ion conductivity and thermal resistance.
Innovation Solution
A new solid electrolyte material comprising Li, Zr, Y, Cl, O, and H, with a molar ratio of O to Y greater than 0.01 and less than or equal to 0.80, which provides high lithium ion conductivity and thermal resistance, and is substantially sulfur-free, enhancing safety and performance in all-solid-state batteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sulfide solid electrolyte materials are used, then lithium ion conductivity can be achieved, but hydrogen sulfide is generated when exposed to atmosphere causing safety concerns
Solution Approach 1:
The patent changes the chemical composition parameters by replacing sulfur with oxygen in the solid electrolyte material, specifically using a molar ratio of O to Y greater than 0.01 and less than or equal to 0.80. This parameter change eliminates hydrogen sulfide generation while maintaining lithium ion conductivity through the oxide-based solid electrolyte structure.
2Reliability
If conventional solid electrolyte materials are used, then basic electrolyte function is provided, but lithium ion conductivity and thermal resistance are not optimal
Solution Approach 1:
The patent employs a composite solid electrolyte material containing multiple elements (Li, Zr, Y, Cl, O, H) with specific compositional ratios. This composite structure achieves both high lithium ion conductivity (≥3×10−4 S/cm) and high thermal resistance (melting point ≥478°C) by combining the beneficial properties of different elements in a synergistic oxide-based framework.
3Productivity
If sulfur-containing solid electrolytes are used, then electrolyte performance can be achieved, but sulfur-related safety issues arise
Solution Approach 1:
The patent extracts and removes sulfur from the solid electrolyte composition entirely, replacing it with oxygen-based compounds. This extraction of the harmful sulfur element eliminates safety issues while preserving the electrolyte's functional performance for charge and discharge operations through the use of oxide and hydroxide components.
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 (≥3×10−4 S/cm) and thermal resistance (melting point ≥478°C), ensuring excellent charge and discharge characteristics while avoiding sulfur-related safety issues, making it suitable for advanced battery applications.
Implementation Method 1
The solid electrolyte material according to the first embodiment can have, for example, practical lithium ion conductivity and thermal resistance such as a high lithium ion conductivity
Implementation Method 2
The solid electrolyte material according to the first embodiment can have, for example, practical lithium ion conductivity and thermal resistance such as a high lithium ion conductivity and a high thermal resistance
Data Source
AI summary
A solid electrolyte material of the present disclosure includes Li, Zr, Y, Cl, O, and H, wherein the molar ratio of O to Y is greater than 0.01 and less than or equal to 0.80. 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.