Halide Solid Electrolyte for High Conductivity and Stability
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Solution Overview
Problem
Current halogen-based solid electrolytes for all-solid-state batteries lack satisfactory ionic conductivity and stability, particularly when interacting with lithium metal, and existing sulfide and oxide-based electrolytes have limitations such as toxicity and formability issues.
Innovation Solution
A novel solid ion conductor compound represented by Formula LiaMbZrcXdTe, where M is a monovalent metal element with an ionic radius between 90 pm and 180 pm, and X is a halogen element, is developed, along with a method involving a mixture of zirconium, lithium, and metal M precursors to form a stable and conductive electrolyte layer for electrochemical cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sulfide-based solid electrolytes are used, then high ionic conductivity is achieved, but toxic gas is generated by reacting with water
Solution Approach 1:
The patent changes the chemical composition parameters of the solid electrolyte from sulfide-based to halide-based (Li-Zr-Cl-O system), fundamentally altering the material's chemical properties to eliminate toxic gas generation while maintaining high ionic conductivity through optimized stoichiometric ratios and phase composition
Solution Approach 2:
The patent creates a composite solid electrolyte material combining multiple elements (Li, Zr, Cl, O) in specific ratios to form a new compound system that integrates the advantages of halide-based materials (chemical stability) with optimized ionic conductivity, resolving the contradiction between safety and performance
2Stability of the object's composition
If oxide-based solid electrolytes are used, then chemical stability is improved, but low formability is observed
Solution Approach 1:
The patent modifies the chemical composition from traditional oxide-based to halide-based (Li-Zr-Cl-O) system, changing the material's inherent properties to achieve both high chemical stability and improved formability through controlled synthesis conditions and phase composition
3Ease of manufacture
If halogen-based solid electrolytes are used, then formability and water stability are improved, but insufficient ionic conductivity and stability are observed
Solution Approach 1:
The patent optimizes the compositional parameters of the halide-based solid electrolyte by precisely controlling the ratios of Li, Zr, Cl, and O elements, and by controlling the synthesis temperature and time parameters, thereby achieving high ionic conductivity (≥10^-4 S/cm at 25°C) while maintaining excellent formability and chemical stability
Solution Approach 2:
The patent develops a composite Li-Zr-Cl-O solid electrolyte system that combines multiple elements in optimized proportions, creating a new material phase that simultaneously achieves high ionic conductivity, chemical stability, and good formability, resolving the limitations of conventional halide-based electrolytes
4Device complexity
If conventional solid electrolytes are used, then manufacturing simplicity is maintained, but insufficient stability with lithium metal is observed
Solution Approach 1:
The patent changes the chemical composition parameters from conventional solid electrolytes to a specific Li-Zr-Cl-O halide-based system with optimized stoichiometry, which inherently provides high stability with lithium metal while maintaining relatively simple manufacturing processes through direct synthesis methods
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 compound achieves enhanced lithium ion conductivity and improved stability, as demonstrated by increased ionic conductivity and prolonged cycle characteristics in all-solid-state secondary batteries, outperforming comparative examples.
Implementation Method 1
solid ion conductor compound having excellent lithium ion conductivity
Data Source
AI summary
A solid ion conductor compound represented by Formula 1, an electrochemical cell including the same, and a method of preparing the solid ion conductor compound. The solid ion conductor is a compound of Formula 1LiaMbZrcXdTe Formula 1wherein in Formula 1, 1<a<3.5, 0<b<1.5, 0<c<1.5, 0<d<7, 0≤e<1, 0<b/d<0.03, and 0.05<c/d<0.18,M is at least one monovalent metal element other than lithium, andT is a metal element different from M, a transition metal element, a post-transition metal element, a metalloid element, or a combination thereof,wherein an ionic radius of M satisfies 90 pm<Mr≤180 pm, wherein Mr is an ionic radius of M, and X is at least one halogen.