Halide-Oxysulfide Solid Electrolyte for Wide-Temperature Li-Ion Conductivity
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Solution Overview
Problem
Current solid electrolyte materials for lithium-ion batteries face challenges in maintaining high ionic conductivity across a wide temperature range and are susceptible to degradation, especially in varying environmental temperatures.
Innovation Solution
A novel solid electrolyte material composed of Li, M (where M is Ti, Zr, or Hf), O, X (where X is F, Cl, or Br), and S, with specific molar ratios optimized to achieve high lithium-ion conductivity, stability, and suitable for use in all-solid-state batteries, including both amorphous and crystalline phases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional solid electrolyte materials are used, then ionic conductivity can be achieved, but stability across wide temperature ranges deteriorates and degradation occurs
Solution Approach 1:
The patent employs composite materials by combining multiple elements (Li, M, O, X, S) to form a solid electrolyte material with the formula Li6-4aMaMbX6-b-cOcSd. This composite approach allows the material to achieve both high ionic conductivity and stability across wide temperature ranges by leveraging the synergistic effects of different elements and phases.
Solution Approach 2:
The patent applies parameter changes by systematically varying the molar ratios of elements (controlled by parameters a, b, c, d) and the phases (amorphous and crystalline) to optimize the balance between ionic conductivity and thermal stability. This enables tuning of material properties to simultaneously improve both conductivity and reliability.
2Productivity
If solid electrolyte material composition is optimized for high ionic conductivity, then charge and discharge characteristics improve, but susceptibility to environmental degradation increases
Solution Approach 1:
The patent converts the potential harm of environmental exposure by incorporating elements (M = Zr, Hf, Ti; X = F, Cl, Br, I) that form stable compounds resistant to degradation. The material composition is designed to withstand environmental conditions while maintaining high ionic conductivity, effectively converting environmental challenges into opportunities for enhanced material robustness.
Solution Approach 2:
The solid electrolyte material creates an inherently stable and inert internal environment through its composition (Li6-4aMaMbX6-b-cOcSd with specific molar ratios), protecting the battery components from environmental degradation while enabling high productivity in charge and discharge operations.
3Temperature
If molar ratios of elements are adjusted to improve stability, then temperature range performance improves, but ionic conductivity may decrease
Solution Approach 1:
The patent utilizes parameter changes by adjusting the molar ratios (a, b, c, d) and phase composition to achieve optimal balance between temperature stability and ionic conductivity. The specific formulation Li6-4aMaMbX6-b-cOcSd with controlled parameters enables the material to maintain high lithium-ion conductivity (1.0 mS/cm or more) across a wide temperature range (-30°C to 80°C).
Solution Approach 2:
The composite material structure combining multiple elements and phases (amorphous and crystalline) allows simultaneous achievement of temperature stability and high ionic conductivity through synergistic interactions among the constituent elements.
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 material achieves high lithium-ion conductivity (1.0 mS/cm or more near room temperature) and maintains stability across a temperature range of -30°C to 80°C, enhancing the charge and discharge characteristics of batteries and ensuring stable operation in varying environments.
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
Data Source
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 of the present disclosure includes: a positive electrode; a negative electrode; and an electrolyte layer provided 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 includes the solid electrolyte material of the present disclosure.