Li-M-I-X Solid Electrolyte Composition for Room-Temperature Conductivity
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Solution Overview
Problem
Current solid electrolyte materials for lithium batteries do not achieve sufficient lithium ion conductivity, which limits the performance and efficiency of lithium-ion batteries, particularly at room temperature.
Innovation Solution
A new solid electrolyte material comprising lithium (Li), a metal from the group Al, Ga, or In, iodine (I), and an element from the group F, O, or S, with specific molar proportions and compositions that enhance ion conductivity, such as Li1−aMaI(1−b)(1+2a)Xb(1+2a)/c, where 0<a<1 and 0<b<1, is developed, allowing for improved lithium ion conduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional solid electrolyte materials (such as Li3AlF6) are used, then the battery structure can be simplified with solid electrolyte alone, but the lithium ion conductivity is insufficient particularly at room temperature
Solution Approach 1:
The patent employs composite materials by combining multiple elements (Li, M, I, and X) to create a new solid electrolyte material with enhanced lithium ion conductivity. The composite nature of the material, incorporating iodine and specific metal elements, allows achieving high ion conductivity (≥2.8×10−5 S/cm) at room temperature, resolving the contradiction between maintaining solid electrolyte simplicity and achieving sufficient conductivity at lower temperatures
2Productivity
If new solid electrolyte material composition is developed to improve ion conductivity, then charge and discharge characteristics are enhanced, but material composition and structure become more complex
Solution Approach 1:
The patent applies parameter changes by systematically varying the composition parameters (a and b in the formula Li1−aMaI(1−b)(1+2a)Xb(1+2a)/c) to optimize lithium ion conductivity. By adjusting these compositional parameters within specific ranges, the material achieves excellent charge and discharge characteristics while maintaining a relatively simple overall structure, thus improving productivity without excessive complexity
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 ion conductivity greater than or equal to 2.8×10−5 S/cm at room temperature, enabling batteries with excellent charge and discharge characteristics and improved energy density and output.
Implementation Method 1
The solid electrolyte material according to the first embodiment has, for example, a high lithium ion conductivity. Accordingly, the solid electrolyte material can be used for obtaining a battery having excellent charge and discharge characteristics.
Data Source
AI summary
The solid electrolyte material of the present disclosure comprises Li, M, I, and X. M is at least one element selected from the group consisting of Al, Ga, and In. X is at least one element selected from the group consisting of F, O, and S. The battery of the present disclosure comprises 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.