Halide Solid Electrolyte Composition for Safe High-Conductivity Batteries
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Solution Overview
Problem
Existing solid electrolyte materials, such as sulfide solid electrolytes, pose safety concerns due to the potential generation of hydrogen sulfide when exposed to the atmosphere, and they often have limited lithium ion conductivity, which affects the performance of batteries.
Innovation Solution
A solid electrolyte material composed of Li, Zr, Y, M (where M is Nb or Ta), and X (where X is Cl or Br) with a specific composition formula (Li6−(4+a−b)c(Zr1−a−bYbMa)cX6) that ensures high lithium ion conductivity and excludes sulfur, enhancing safety and performance in batteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sulfide solid electrolyte materials are used in all-solid batteries, then the battery structure can be established, but hydrogen sulfide is generated when exposed to the atmosphere causing safety concerns
Solution Approach 1:
The patent extracts and removes sulfur from the solid electrolyte composition entirely, replacing sulfide-based materials with halide-based materials (chloride or bromide). This extraction of the harmful sulfur component eliminates hydrogen sulfide generation while maintaining the solid electrolyte's functional properties for battery operation.
Solution Approach 2:
The patent changes the chemical composition parameters of the solid electrolyte by adopting a specific formula Li6−(4+a−b)c(Zr1−a−bYbMa)cX6 where X is Cl or Br instead of S. This parameter change from sulfide to halide chemistry fundamentally alters the material's stability characteristics, preventing hydrogen sulfide generation while maintaining ionic conductivity.
2Productivity
If conventional solid electrolyte materials are used, then the battery can operate, but the lithium ion conductivity is limited affecting battery performance
Solution Approach 1:
The patent employs a composite material system with multiple elements (Li, Zr, Y, M where M is Nb or Ta, and X where X is Cl or Br) in specific compositional ratios. This composite approach combines different metallic and halide components to achieve synergistic effects that enhance lithium ion conductivity beyond what single-component materials can provide.
Solution Approach 2:
The patent introduces localized structural modifications through dopants (Y, Nb, Ta) at specific positions in the crystal lattice. These local compositional variations create favorable pathways for lithium ion transport while maintaining overall structural stability, thereby enhancing ionic conductivity without compromising material integrity.
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 material achieves high lithium ion conductivity and excellent charge and discharge characteristics, providing a safer and more efficient battery solution by eliminating sulfur and improving ion conductivity, thus enabling better energy density and output.
Implementation Method 1
The solid electrolyte material according to the present disclosure has a high lithium ion conductivity
Data Source
AI summary
The present disclosure provides a solid electrolyte material having a high lithium ion conductivity. The solid electrolyte material according to the present disclosure includes Li, Zr, Y, M, and X. M is at least one element selected from the group consisting of Nb and Ta. X is at least one element selected from the group consisting of Cl and Br.