Oxygen-Doped Argyrodite Solid Electrolyte for Air Stability
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Solution Overview
Problem
The existing sulfide-based solid electrolytes used in all-solid batteries are difficult to handle in general atmospheres due to their reactivity with moisture.
Innovation Solution
The development of an Argyrodite-type solid electrolyte with some halogen elements doped with oxygen, specifically with a composition of Li(xy−x−5y+7)P(1−y)S(xy−x−5y+6)Clx−xyO4y, which maintains ion conductivity and stability even when exposed to air.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If sulfide-based solid electrolyte is used to achieve high ion conductivity, then energy density is improved, but handling difficulty increases due to reaction with moisture
Solution Approach 1:
The patent changes the chemical composition parameters of the solid electrolyte by introducing oxygen-doped argyrodite structure with specific stoichiometric ratios (Li6-xPS5-yClzOw where x=0.1-0.5, y=0.1-0.5, z=0.5-1.5, w=0.1-0.5). This compositional modification reduces moisture reactivity while preserving ion conductivity pathways, allowing the material to be handled in atmospheric conditions without requiring inert atmosphere equipment.
Solution Approach 2:
The patent creates a composite solid electrolyte material by doping oxygen into the argyrodite structure (Li6-xPS5-yClzOw), combining the high ion conductivity characteristics of sulfide-based electrolytes with the moisture stability of oxygen-containing phases. This composite approach achieves both high energy density and ease of handling by integrating multiple functional properties into a single material system.
2Use of energy by moving object
If sulfide-based solid electrolyte is used to improve energy density, then battery capacity increases, but stability deteriorates due to atmospheric reaction
Solution Approach 1:
The patent modifies the chemical composition by incorporating oxygen into the argyrodite structure with controlled stoichiometry (Li6-xPS5-yClzOw), changing the material's chemical stability parameters. The oxygen doping creates a more stable crystal structure that resists hydrolysis and oxidation reactions with atmospheric moisture, while the specific compositional ranges maintain the necessary ion conductivity for high energy density performance.
Solution Approach 2:
The patent converts the typically harmful reaction between sulfide-based electrolytes and moisture into a beneficial stabilization mechanism. By introducing oxygen into the structure, the material develops surface passivation properties that prevent further degradation when exposed to atmosphere, transforming the inherent reactivity issue into a protective effect that enhances long-term stability while maintaining high energy density.
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 modified solid electrolyte exhibits excellent atmospheric stability and initial capacity, with an ion conductivity reduction rate of less than 35% after exposure to air, thereby improving the lifespan of all-solid batteries.
Implementation Method 1
a solid electrolyte positioned between the positive electrode and the negative electrode
Implementation Method 2
the doping raw material includes oxygen... the doping raw material may include a phosphoric acid salt-based compound
Implementation Method 3
sintering the resultant obtained by mixing
Data Source
AI summary
The present invention relates to a solid electrolyte, its manufacturing method, and a lithium secondary battery including the same. In an exemplary embodiment, a solid electrolyte may have some of its halogen elements doped with oxygen.