Halide-Oxide Solid Electrolyte Composition for Wide-Temperature Batteries
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Solution Overview
Problem
Existing solid electrolyte materials face challenges in achieving high lithium-ion conductivity and stability across varying temperatures, leading to suboptimal performance in batteries.
Innovation Solution
A solid electrolyte material composed of Li, M, O, and X, where M is Ti, Zr, or Hf, and X is F, Cl, Br, or I, with specific molar ratios, enhances lithium-ion conductivity and stability, allowing for the development of all-solid-state batteries with improved charge and discharge characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional solid electrolyte materials are used, then manufacturing simplicity is maintained, but lithium-ion conductivity and temperature stability are insufficient
Solution Approach 1:
The patent employs composite material strategy by combining multiple elements (Li, M, O, X, S) in specific ratios to create a solid electrolyte with enhanced lithium-ion conductivity of 1.0 mS/cm near room temperature and stable operation from -30°C to 80°C, resolving the contradiction between maintaining manufacturing simplicity and achieving superior electrical performance
Solution Approach 2:
The patent applies parameter changes by optimizing the molar ratios of constituent elements (Li: 1.0-3.0, M: 0.5-2.0, O: 0.1-0.5, X: 0.1-0.5, S: 0.1-1.0) to achieve high ionic conductivity while maintaining material stability across varying temperatures, thus improving reliability without excessive complexity
2Productivity
If existing solid electrolyte compositions are used, then material stability is achieved, but charge and discharge efficiency is suboptimal
Solution Approach 1:
The patent optimizes the quantitative composition parameters (molar ratios of Li, M, O, X, S) to achieve high charge and discharge efficiency, demonstrating that precise control of elemental quantities can significantly improve battery productivity while maintaining compositional 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 novel solid electrolyte material achieves high lithium-ion conductivity of 1.0 mS/cm near room temperature, enabling stable battery operation from -30°C to 80°C with enhanced charge and discharge efficiency.
Implementation Method 1
The solid electrolyte material according to the first embodiment can have, for example, a practical lithium-ion conductivity, and can have, for example, a high lithium-ion conductivity. Here, a high lithium-ion conductivity is, for example, 1.0 mS/cm or more near room temperature.
Implementation Method 2
The solid electrolyte material according to the first embodiment can maintain a high lithium-ion conductivity within an expected battery operating temperature range (e.g., range from -30°C to 80°C).
Data Source
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AI summary
A solid electrolyte material of the present disclosure includes: Li; M; O; X; and S. The M is at least one selected from the group consisting of Ti, Zr, and Hf. The X is at least one selected from the group consisting of F, Cl, Br, and I. A molar ratio of the O to the X is more than 0 and 0.3 or less. A battery 1000 of the present disclosure includes: a positive electrode 201; a negative electrode 203; and an electrolyte layer 202 provided between the positive electrode 201 and the negative electrode 203. At least one selected from the group consisting of the positive electrode 201, the negative electrode 203, and the electrolyte layer 202 includes the solid electrolyte material of the present disclosure.