Argyrodite Solid Electrolyte Composition for Conductive Fine Particles
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Solution Overview
Problem
Existing solid electrolytes for all-solid lithium batteries have limitations in achieving both reduced particle diameter and improved lithium ion conductivity, which are crucial for enhanced battery performance and stability.
Innovation Solution
Development of a solid ion conductor compound with an argyrodite type crystal structure, specific metal and halogen compositions, and a method of preparing these compounds with controlled particle diameters to improve lithium ion conductivity and electrochemical stability, including a process of mixing precursor compounds and heat-treating them to achieve optimal properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If solid electrolyte materials are pulverized to have a certain average particle diameter for application, then the material can be processed and applied, but the particle diameter cannot be sufficiently reduced to improve lithium ion conductivity
Solution Approach 1:
The patent changes the chemical composition parameters of the solid electrolyte material by introducing specific dopants (Li3PO4, Li2SiO3, Li2CO3) in controlled amounts. This compositional parameter change enables the material to achieve high lithium ion conductivity (3 mS/cm or more at 25°C) while maintaining a practical particle diameter range (0.1-7 μm) that can be manufactured and applied effectively.
2Reliability
If the particle diameter is reduced to improve lithium ion conductivity, then ion transport may be enhanced, but the manufacturing complexity and difficulty increase
Solution Approach 1:
The patent incorporates lithium-containing compounds (Li3PO4, Li2SiO3, Li2CO3) as dopants during the initial synthesis stage of the solid electrolyte material. This preliminary action ensures that the material possesses high lithium ion conductivity from the outset, eliminating the need for subsequent complex particle size reduction processes and simplifying the overall manufacturing workflow.
Solution Approach 2:
The patent creates a composite solid electrolyte material by combining the base sulfide compound with multiple lithium-containing dopants (Li3PO4, Li2SiO3, Li2CO3). This composite structure synergistically enhances lithium ion conductivity while maintaining manufacturable particle dimensions, avoiding the need for extremely fine particle processing that would increase manufacturing complexity.
3Ease of operation
If solid electrolyte materials are used with larger particle diameters for ease of handling, then processing is simpler, but lithium ion conductivity and battery performance deteriorate
Solution Approach 1:
The patent modifies the chemical composition parameters by adding specific lithium-containing dopants (Li3PO4, Li2SiO3, Li2CO3) in optimized proportions. This compositional change enables the material to achieve high lithium ion conductivity (3 mS/cm or more at 25°C) across a broad particle diameter range (0.1-7 μm), allowing easier handling and processing while maintaining excellent electrochemical performance.
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 solution results in solid ion conductor compounds with ion conductivity of 3 mS/cm or more at 25°C and average particle diameters between 0.1 µm to 7 µm, leading to improved cycle characteristics and stability in all-solid secondary batteries, as demonstrated by increased discharge capacities and charge-discharge efficiencies.
Implementation Method 1
has an ion conductivity of 3 mS/cm or more at 25° C.
Implementation Method 2
heat-treating the mixture to prepare a solid ion conductor compound
Data Source
AI summary
Disclosed herein are a solid ion conductor compound includinga compound that is represented by Formula 1 and has an argyrodite-type crystal structure, an ion conductivity of 3 mS/cm or more at 25° C., and an average particle diameter of 0.1 µm to 7 µm, a solid electrolyte including the solid ion conductor compound, an electrochemical cell including the solid ion conductor compound, and a method of preparing the solid ion conductor compound.In Formula 1,M1 is at least one metal element selected from Group 1 to 15 elements, except for Li, in the Periodic Table,M2 is at least one element selected from Group 17 elements in the Periodic Table,M3 isSOn, and4≤a≤8, 0≤x<1, 3≤y≤7, 0<z≤2, 0≤w<2, 1.5≤n≤5, and 0<x+w<3.