NaxLi3-xYCl6 Solid Electrolyte for Stable High-Safety Batteries
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Solution Overview
Problem
Developing effective solid-state electrolytes for lithium-ion and sodium-ion batteries is challenging due to the need for materials that provide improved safety, thermal stability, energy density, and power density, while conventional liquid electrolytes pose safety hazards and have limited temperature ranges.
Innovation Solution
The compound NaxLi3-xYCl6, with x greater than 0 and less than 3, is used as a solid-state battery electrolyte, exhibiting a trigonal ordered crystal structure, effective ionic conductivity, formability, oxidation/reduction stability, and compatibility with anode and cathode materials, enabling the creation of solid-state lithium-ion, sodium-ion, or dual ion batteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If liquid electrolytes are used in lithium-ion batteries, then the batteries can achieve conventional performance, but safety hazards and fire risks occur during over-charging or short circuiting
Solution Approach 1:
The patent transitions the electrolyte from liquid phase to solid phase by using inorganic solid particles (such as sulfides, oxides, or halides) as the electrolyte medium. This phase transition eliminates the flammability and leakage issues inherent in liquid electrolytes, directly resolving the safety and fire hazard problems while maintaining ionic conductivity for battery operation.
2Reliability
If solid-state electrolytes are used to improve safety, then thermal stability and safety improve, but challenges remain in developing effective and widely adoptable solid-state batteries
Solution Approach 1:
The patent creates a composite electrolyte system consisting of inorganic solid particles dispersed in a binder material. This composite structure combines the thermal stability and safety benefits of inorganic solids with the processability and flexibility of polymer or organic binder materials, making the solid-state electrolyte both safe and manufacturable for commercial battery production.
Solution Approach 2:
The binder material acts as an intermediary between the inorganic solid particles, providing a matrix that holds the particles together while maintaining ionic conductivity pathways. This intermediary component enables the solid electrolyte to be formed into coherent structures suitable for battery assembly, bridging the gap between particle-level properties and macroscopic device requirements.
3Temperature
If conventional liquid electrolytes are used, then the batteries can operate, but the working temperature range is limited
Solution Approach 1:
By using inorganic solid particles as the electrolyte medium, the patent enables battery operation across a broader temperature range. Solid electrolytes maintain their structural integrity and ionic conductivity at both low and high temperatures where liquid electrolytes would freeze or decompose, respectively, thus expanding the operational temperature window while enhancing thermal 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
NaxLi3-xYCl6 demonstrates enhanced ionic conductivity and stability, facilitating the development of safer and more efficient solid-state batteries with broader temperature ranges and improved energy density, suitable for various applications.
Implementation Method 1
The disclosed compound can exhibit characteristics beneficial for solid-state battery electrolyte applications. Such characteristics include, for example, effective ionic conductivity
Data Source
AI summary
Disclosed herein is the compound NaxLi3-xYCl6 (0<x<3), which is usable as an effective solid-state battery electrolyte. The disclosed compound can have a trigonal ordered crystal structure. The disclosed compound can exhibit characteristics beneficial for solid-state battery electrolyte applications.