Halide Solid Electrolyte Crystal Control for Higher Li-Ion Conductivity
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Solution Overview
Problem
Current solid electrolyte materials for lithium-ion batteries have limitations in lithium ion conductivity, which affects the charge and discharge characteristics of batteries.
Innovation Solution
A solid electrolyte material with a crystal phase comprising Li, M (Al, Ga, or In), and X (Cl, Br, or I) is developed, with a specific X-ray diffraction pattern and mechanochemical synthesis method to enhance lithium ion conductivity, achieving a high ion conductivity of greater than or equal to 2.5×10−5 S/cm at room temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional solid electrolyte materials are used, then battery structure can be maintained, but lithium ion conductivity is insufficient
Solution Approach 1:
The patent changes the crystal structure parameters of the solid electrolyte material by controlling the full width at half maximum (FWHM) of the (202) diffraction peak to be 0.27° or more, which corresponds to specific crystallite size and surface area parameters. This parameter control optimizes lithium ion conductivity without requiring complex synthesis procedures, resolving the contradiction between performance improvement and manufacturing simplicity.
2Reliability
If crystal phase structure is optimized for lithium ion conductivity, then ion transport is enhanced, but manufacturing precision requirements increase
Solution Approach 1:
The patent employs mechanochemical synthesis using ball milling, which utilizes mechanical vibration and impact forces to activate the crystal phase transformation. This mechanical energy input enables precise control of the (202) diffraction peak FWHM and crystallite size without requiring extremely precise control of synthesis conditions, thus achieving high lithium ion conductivity while maintaining ease of manufacture.
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 improves lithium ion conductivity, leading to excellent charge and discharge characteristics in batteries, particularly in all-solid-state secondary batteries, with a crystallite size and specific surface area optimization that enhances ion transport.
Implementation Method 1
a solid electrolyte material that is suitable for improving lithium ion conductivity
Implementation Method 2
In an X-ray diffraction pattern obtained by X-ray diffraction measurement of the solid electrolyte material
Implementation Method 3
an X-ray diffraction pattern obtained by X-ray diffraction measurement of the solid electrolyte material, a full width at half maximum of a diffraction peak
Data Source
AI summary
The solid electrolyte material of the present disclosure contains a crystal phase comprising Li, M, and X. M is at least one selected from the group consisting of Al, Ga, and In. X is at least one selected from the group consisting of Cl, Br, and I. The crystal phase belongs to the space group P21/c. In an X-ray diffraction pattern obtained by X-ray diffraction measurement of the solid electrolyte material, the full width at half maximum of a diffraction peak of a crystal phase assigned to the Miller index (202) crystal plane is greater than or equal to 0.27° and less than or equal to 0.50°.