Iodine-Based Solid Electrolyte for Safe Lithium-Ion Conduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing lithium ion-conductive solid electrolyte materials, such as those containing sulfur, face challenges in achieving high lithium ion conductivity and safety due to potential hydrogen sulfide generation when exposed to the atmosphere.
Innovation Solution
A solid electrolyte material composed of Li, La, and I (iodine) with a specific compositional formula (LiaLabOIc) is developed, which exhibits high lithium ion conductivity without containing sulfur, thereby preventing hydrogen sulfide generation and ensuring safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sulfur-containing solid electrolyte materials are used, then lithium ion conductivity can be achieved, but hydrogen sulfide generation occurs when exposed to atmosphere causing safety issues
Solution Approach 1:
The patent removes sulfur from the solid electrolyte composition entirely, extracting the harmful element that causes hydrogen sulfide generation. The electrolyte is formulated using only Li, La, O, and I elements, eliminating the source of the harmful byproduct while maintaining ionic conductivity functionality.
Solution Approach 2:
The patent converts the limitation of non-sulfur materials into a benefit by demonstrating that iodine-containing electrolytes can achieve high lithium ion conductivity (≥5×10⁻⁵ S/cm) without the harmful side effects of sulfur-based materials, turning a potential performance drawback into a safety advantage.
2Productivity
If high lithium ion conductivity is achieved in solid electrolyte materials, then battery performance improves, but material composition becomes more complex
Solution Approach 1:
The patent optimizes the stoichiometric ratios of Li, La, O, and I elements in the electrolyte formula LiaLabOIc to achieve high ionic conductivity. By carefully adjusting the parameters (a, b, c) within specific ranges, the material achieves ≥5×10⁻⁵ S/cm conductivity while maintaining a relatively simple four-element composition.
Solution Approach 2:
The patent creates a composite solid electrolyte material combining lithium oxide (Li2O) and lanthanum iodide (LaI3) in specific ratios, forming a new compound with enhanced lithium ion conductivity that exceeds the performance of simple binary materials while avoiding the complexity of multi-element sulfur-based systems.
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 ion conductivity greater than or equal to 5×10−5 S/cm at room temperature, enhancing charge and discharge characteristics in all-solid-state batteries while maintaining safety by avoiding sulfur content.
Implementation Method 1
a solid electrolyte material consisting of Li, La, O, and I... exhibits high lithium ion conductivity
Data Source
AI summary
The solid electrolyte material of the present disclosure consists of Li, La, O, and I. The battery of the present disclosure includes a positive electrode, a negative electrode, and an electrolyte layer. The electrolyte layer is 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.