Sulfide Solid Electrolyte Composition With Red Phosphorus Flame Retardancy
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Solution Overview
Problem
Existing sulfide solid electrolytes face challenges in achieving both high ionic conductivity and flame retardancy while minimizing hydrogen sulfide generation, as conventional flame retardants reduce ionic conductivity and are prone to hydrogen sulfide generation.
Innovation Solution
Incorporating red phosphorus into the sulfide solid electrolyte composition, which enhances flame retardancy and suppresses hydrogen sulfide generation without significantly reducing ionic conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional flame retardants are added to sulfide solid electrolyte, then flame retardancy is improved, but ionic conductivity is reduced
Solution Approach 1:
The patent changes the chemical composition parameters by using specific ratios of Li2S (40-70 wt%), P2S5 (20-50 wt%), and red phosphorus (1-10 wt%), optimizing the balance between flame retardancy and ionic conductivity. This parameter optimization resolves the contradiction by finding the optimal composition range where both requirements are satisfied.
Solution Approach 2:
The patent creates a composite solid electrolyte material combining Li2S-P2S5 base composition with red phosphorus additive. This composite structure achieves synergistic effects where the base composition provides ionic conductivity and the red phosphorus provides flame retardancy, resolving the contradiction between these two properties.
2Object-affected harmful factors
If conventional flame retardants are added to sulfide solid electrolyte, then flame retardancy is improved, but hydrogen sulfide generation is increased
Solution Approach 1:
The patent converts the potential harm of red phosphorus (which can generate H2S) into a benefit by using it as a flame retardant that forms protective phosphoric acid layers. This layer actually suppresses H2S generation by preventing contact between moisture and the sulfide electrolyte, thus converting a potential harm into a beneficial protective mechanism.
Solution Approach 2:
Red phosphorus acts as an intermediary substance that forms a protective interface between the sulfide solid electrolyte and the environment. This intermediary layer prevents direct interaction between moisture and the electrolyte, thereby suppressing H2S generation while maintaining flame retardancy.
3Reliability
If sulfide solid electrolyte is exposed to air and water, then ionic conductivity is maintained, but hydrogen sulfide generation occurs
Solution Approach 1:
The patent applies preliminary protective action by incorporating red phosphorus into the electrolyte composition before exposure to air and water. This pre-built protective mechanism forms phosphoric acid layers upon contact with moisture, preventing H2S generation while maintaining ionic conductivity, thus addressing the contradiction proactively.
Solution Approach 2:
The patent converts the harmful reaction between sulfide electrolyte and moisture (which generates H2S) into a beneficial protective mechanism. The red phosphorus reacts with moisture to form phosphoric acid layers that actually protect the electrolyte from further degradation and H2S generation, thus converting harm into benefit.
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 sulfide solid electrolyte composition exhibits excellent flame retardancy, high ionic conductivity, and effective hydrogen sulfide suppression, maintaining performance even after prolonged exposure to air and water.
Implementation Method 1
it has become increasingly important to suppress hydrogen sulfide generation from the sulfide solid electrolyte
Implementation Method 2
PTL 4 discloses a lithium ion-conductive nonflammable solid electrolyte of a solid electrolyte containing a lithium element, a phosphorus element, a sulfur element, and further a germanium element, a boron element and a silicon element and added with a flame retardant such as a silicone compound
Implementation Method 3
a battery using an organic solvent-containing electrolyte as an electrolytic solution exhibits a high ionic conductivity
Data Source
Figure 1
AI summary
Provided are a sulfide solid electrolyte composition containing a sulfide solid electrolyte and red phosphorus, having an excellent flame retardancy and a high ionic conductivity and further having excellent hydrogen sulfide generation suppressing performance; an electrode mixture containing the composition; and a method for producing a sulfide solid electrolyte composition including mixing a sulfide solid electrolyte and red phosphorus.