Argyrodite Sulfide Electrolyte Composition for Moisture-Stable Ion Conduction
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Solution Overview
Problem
Existing rechargeable lithium batteries face challenges in achieving high energy density, portability, and safety, particularly in applications like electric vehicles, where they require high ionic conductivity and moisture stability.
Innovation Solution
The development of an argyrodite-type sulfide solid electrolyte represented by Chemical Formula 1, which includes specific elements and ratios to enhance lithium ionic conductivity and moisture stability, is proposed. This solid electrolyte is integrated into an all-solid-state rechargeable battery configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional rechargeable lithium batteries are used to achieve high energy density, then energy storage capacity is improved, but safety and moisture stability deteriorate
Solution Approach 1:
The patent changes the chemical composition parameters of the electrolyte by incorporating argyrodite-type sulfide with specific stoichiometric ratios (LiaM1bM2c)(PdM3e)(SfX1g)X2h where a=4-8, b=0.001-0.1, c=0-0.3, d+e=0.9-1.1, d=0.7-0.99, e=0.01-0.3, f=3-7, g=0-0.9, h=1-2). This parameter optimization achieves both high ionic conductivity (≥2.0 mS/cm at 25°C) and improved moisture stability, resolving the contradiction between energy density and reliability.
Solution Approach 2:
The patent uses composite material design by combining multiple elements (Li, M1 from Groups 2 and 11, M2 from Group 1, M3 from p-block, S, and halogen X1) in specific ratios to form the argyrodite-type sulfide structure. This composite approach enables simultaneous achievement of high energy density through enhanced ionic conductivity and improved moisture stability through the robust sulfide lattice structure.
2Power
If ionic conductivity is increased to improve battery performance, then energy efficiency is improved, but moisture stability deteriorates
Solution Approach 1:
The patent achieves the dual goal of high ionic conductivity and moisture stability by precisely controlling compositional parameters: M1 content (b=0.001-0.1) for conductivity enhancement, M2 content (c=0-0.3) for structural stability, and halogen content (g=0-0.9, h=1-2) for moisture resistance. The resulting material maintains ≥2.0 mS/cm ionic conductivity at 25°C while exhibiting superior moisture stability.
3Weight of moving object
If solid electrolyte membrane thickness is reduced to improve battery portability, then device portability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent optimizes the solid electrolyte membrane thickness parameter to balance portability and manufacturability. By controlling the membrane thickness within the range of 100-1000 μm, the invention achieves reduced battery weight for improved portability while maintaining manufacturing feasibility and ensuring sufficient mechanical strength and ionic conductivity for practical application.
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 argyrodite-type sulfide solid electrolyte achieves high lithium ionic conductivity of about 2.0 mS/cm at 25°C and maintains significant moisture stability, improving the performance and durability of all-solid-state rechargeable batteries.
Implementation Method 1
The solid electrolyte may have an ionic conductivity of greater than or equal to about 2.0 mS/cm at 25° C.
Data Source
AI summary
An argyrodite-type sulfide solid electrolyte represented by Chemical Formula 1,(LiaM1bM2c)(PdM3e)(SfX1g)X2h [Chemical Formula 1]In Chemical Formula 1, 4≤a≤8, M1 is at least one element selected from Groups 2 and 11 of the periodic table, 0<b<0.5, M2 is at least one element other than Li selected from Group 1 of the periodic table, 0≤c<0.5, M3 is Bi, Cu, Ge, Sb, Si, Sn, Zn, or a combination thereof, 0<d<1, 0<e<1, X1 is O, N, SOn, or a combination thereof, 1.5≤n≤5, 3≤f≤7, 0≤g<2, X2 is at least one element selected from Group 17 of the periodic table, and 0<h≤2.