Mixed Inorganic Electrolyte Stability and Conductivity
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Solution Overview
Problem
Solid sulfide electrolytes in batteries face stability issues, particularly in the presence of moisture, leading to toxic gas release and degradation when in contact with active electrode materials, while oxides offer higher stability but lower ionic conductivity and unsuitable high-temperature processing for industrial applications.
Innovation Solution
Development of mixed inorganic compounds with the formula (A(t-v)Bv/2)[(PS4)(1-x)(OHzAUX1)x])(1-y)(LinX2)y, which combine the stability of oxides with the electrochemical performance of sulfides, reducing H2S release and maintaining ionic conductivity, achieved through a co-grinding method without high-temperature annealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If sulfide electrolytes are used, then ionic conductivity and energy density are improved, but stability deteriorates due to moisture reaction and toxic gas release
Solution Approach 1:
The patent applies composite materials by combining sulfide and oxide components in a single electrolyte structure. The sulfide phase provides high ionic conductivity while the oxide phase provides chemical stability and prevents moisture reaction. This composite approach allows the electrolyte to simultaneously achieve the benefits of both material types without suffering from their individual drawbacks.
2Reliability
If oxide electrolytes are used, then stability is improved, but ionic conductivity deteriorates
Solution Approach 1:
The patent uses composite materials to combine oxide and sulfide phases, where the oxide provides stability and the sulfide provides ionic conductivity. This allows the electrolyte to achieve both high stability and high ionic conductivity simultaneously, resolving the trade-off between these two properties.
3Ease of manufacture
If high-temperature heat treatment is applied to oxide electrolytes, then manufacturing is improved, but device complexity and safety risks increase
Solution Approach 1:
The patent applies parameter changes by modifying the chemical composition to include both sulfide and oxide components, which fundamentally changes the processing requirements. Instead of requiring high-temperature treatment (>700°C) as with pure oxides, the composite material can be processed at lower temperatures while still achieving the desired stability and performance, thereby reducing safety risks.
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 mixed compounds enhance the stability and safety of sulfide electrolytes, maintaining electrochemical performance and ionic conductivity, facilitating the industrialization of all-solid battery technologies with reduced safety risks and improved energy densities.
Implementation Method 1
The compounds with formula (I) are used for the conduction of alkaline ions (in particular lithium)
Implementation Method 2
The high ionic conductivity values thereof combined with the ductility thereof
Implementation Method 3
the preparation method of compounds with formula (I) according to the invention, said method comprising the step of co-grinding the precursors of the compound with formula (I)
Data Source
AI summary
The present application relates to novel mixed compounds based on oxides and sulfides, and the use thereof as a solid electrolyte, with improved sulfide stability. The application further relates to electrochemical elements and lithium batteries containing such electrolytes.