Argyrodite Solid Electrolyte With Low Lattice Strain for Li-Ion Conductivity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing solid electrolytes do not effectively control the argyrodite rate or lattice strain, which limits their lithium ion conductivity.
Innovation Solution
A solid electrolyte with a high argyrodite rate (97 wt% or more) and controlled lattice strain (less than 0.10%) is achieved by using a compound with an argyrodite-type crystal structure, represented by LiaPSbXc, where X is an elemental halogen, and optimizing the calcination process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional solid electrolyte compositions are used, then the basic structure is established, but the lithium ion conductivity remains insufficient due to uncontrolled argyrodite rate and lattice strain
Solution Approach 1:
The patent applies parameter changes by precisely controlling the compositional parameters (a, b, c) in the formula LiaPSbXc and the calcination temperature (300-500°C) to achieve the desired argyrodite rate of 97 wt% or more and lattice strain of less than 0.10%, thereby resolving the contradiction between achieving high lithium ion conductivity and controlling manufacturing precision
Solution Approach 2:
The patent employs feedback control by using XRD analysis to measure the argyrodite rate and adjusting the calcination conditions accordingly to ensure the argyrodite rate reaches 97 wt% or more, which directly improves lithium ion conductivity while maintaining precise control over the crystal structure
2Reliability
If the argyrodite rate is increased to improve lithium ion conductivity, then the conductivity increases, but the manufacturing complexity increases due to lack of specific control methods
Solution Approach 1:
The patent simplifies the process control by establishing specific parameter ranges: calcination temperature of 300-500°C, composition parameters a (3.0-6.0), b (3.5-4.8), and c (0.1-3.0), which automatically guide the manufacturing process to achieve high argyrodite rate without requiring complex control systems
Solution Approach 2:
The patent applies preliminary action by pre-determining the optimal calcination temperature range (300-500°C) and composition parameters before manufacturing, allowing the process to naturally achieve the desired argyrodite rate of 97 wt% or more without requiring complex real-time adjustments during production
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 solid electrolyte exhibits significantly improved lithium ion conductivity, reaching values of 4.0 mS/cm or more at room temperature, due to the high argyrodite rate and controlled lattice strain.
Implementation Method 1
High lithium ion conductivity is one of the characteristics required of solid electrolytes
Implementation Method 2
a compound that has a crystal phase having an argyrodite-type crystal structure
Data Source
AI summary
A solid electrolyte contains a compound that has a crystal phase having an argyrodite-type crystal structure and that is represented by LiaPSbXc, where X is at least one elemental halogen, a represents a number of 3.0 or more and 6.0 or less, b represents a number of 3.5 or more and 4.8 or less, and c represents a number of 0.1 or more and 3.0 or less. The proportion of the crystal phase with an argyrodite-type structure relative to all crystal phases constituting the solid electrolyte is 97.0 wt % or more. The compound has a lattice strain of less than 0.10%. The solid electrolyte preferably exhibits a lithium ion conductivity of 4.0 mS/cm or more.