Disordered Halide Solid Electrolyte for Stable Lithium-Ion Transport
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Solution Overview
Problem
Current solid-state lithium batteries require improved solid electrolyte materials with enhanced ionic conductivity, mechanical properties, and stability to overcome limitations in energy density and safety compared to conventional lithium-ion batteries.
Innovation Solution
Development of a halide-based solid electrolyte material with a disordered crystalline structure, specifically a halide-based electrolyte material represented by M3−z(Mek+)fX3−z+k*f, incorporating stacking faults and atomic vacancies, which improves ionic conductivity and mechanical properties, and is formed through a controlled process that allows for precise control over crystallinity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional lithium-ion batteries are used, then safety concerns are reduced, but energy density and recharging speed are limited
Solution Approach 1:
The patent changes the fundamental parameters of the battery system by replacing liquid electrolytes with solid electrolyte materials having specific disordered crystalline structures. This parameter change enables the use of lithium metal anodes, which directly increases energy density while the solid electrolyte provides inherent safety improvements by eliminating flammable liquid components.
Solution Approach 2:
The patent employs composite solid electrolyte materials combining multiple elements (Li, Y, rare earth metals, transition metals) in specific ratios to achieve both high ionic conductivity for energy density and structural stability for safety. The composite nature allows optimization of both contradictory requirements simultaneously.
2Productivity
If solid electrolyte materials are improved for higher energy density, then ionic conductivity increases, but mechanical properties and stability may deteriorate
Solution Approach 1:
The patent introduces controlled disorder parameters into the crystalline structure, specifically stacking faults and atomic vacancies, which fundamentally change the material properties. These parameter changes create fast ion conduction pathways while the overall crystalline framework maintains mechanical integrity, resolving the contradiction between ionic conductivity and mechanical stability.
Solution Approach 2:
The patent applies local quality by creating specific disordered regions (stacking faults and atomic vacancies) within an otherwise ordered crystalline structure. These localized disordered zones provide high ionic conductivity pathways, while the surrounding ordered structure maintains mechanical strength and stability.
3Productivity
If a disordered crystalline structure is introduced to improve ionic conductivity, then ion transport increases, but structural stability may decrease
Solution Approach 1:
The patent applies partial action by introducing only specific types and amounts of disorder (stacking faults and atomic vacancies) rather than complete amorphization. This partial disordering is sufficient to create ion conduction pathways while maintaining enough crystalline order to preserve structural stability.
Solution Approach 2:
The patent carefully controls the parameters of disorder (type, quantity, distribution of stacking faults and atomic vacancies) to achieve optimal balance. By adjusting these parameters, the material achieves high ionic conductivity while the crystalline framework remains stable enough to maintain mechanical 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 halide-based electrolyte material demonstrates improved ionic conductivity, mechanical stability, and thermal stability, enabling enhanced performance in solid-state lithium batteries with increased energy density and reduced safety concerns.
Implementation Method 1
The halide-based electrolyte material demonstrates improved ionic conductivity
Implementation Method 2
formed through a controlled process that allows for precise control over crystallinity
Data Source
AI summary
A solid electrolyte material can include a halide-based material having a crystalline structure including a disorder. In an embodiment, the solid electrolyte material can include a crystalline structure include stacking faults. In another embodiment, the solid electrolyte material can include a crystalline phase including a crystalline structure represented by a space group of the hexagonal crystal system or a space group of a rhombohedral lattice system. In another embodiment, the solid electrolyte material can include a crystalline phase including a crystalline structure represented by a monoclinic space group and a unit cell containing a reduced number of halogen atoms.