Sulfide Electrolyte Granules for Low H2S and Dust Control
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Solution Overview
Problem
Solid sulfide electrolytes for lithium batteries face challenges such as hydrogen sulfide release, carbonation, and dust issues, which affect safety and ionic conductivity, and require a form that is easily mixed with polymeric binders for electrode or electrolyte layer preparation.
Innovation Solution
A composition comprising lithium sulfide (Li2S), diphosphorus pentasulfide (P2S5), and lithium halides, calcined and sieved to produce granules with controlled particle size and shape, exhibiting low H2S emission and improved mechanical durability, allowing for reduced dust and enhanced handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If solid sulfide electrolytes are used to replace liquid electrolytes, then safety is improved by eliminating flammability, but hydrogen sulfide release occurs when the material contacts humidity
Solution Approach 1:
The patent applies this principle by incorporating a hydrogen sulfide scavenger material that converts the harmful H2S gas generated by sulfide electrolyte degradation into harmless substances. The scavenger material chemically reacts with H2S to form stable compounds, thereby eliminating the safety hazard while preserving the benefits of solid sulfide electrolytes.
Solution Approach 2:
The patent creates a composite electrolyte system combining solid sulfide electrolyte particles with hydrogen sulfide scavenger material. This composite structure allows the sulfide electrolyte to provide high ionic conductivity while the scavenger component simultaneously neutralizes H2S release, resolving the contradiction between safety improvement and harmful gas generation.
2Ease of operation
If solid sulfide electrolytes are exposed to air, then handling and transportation become easier, but carbonation occurs resulting in detrimental effects on ionic conductivity
Solution Approach 1:
The patent applies this principle by enclosing solid sulfide electrolyte particles in an inert matrix material that creates a protective environment. This matrix acts as a physical barrier preventing direct contact between the sulfide electrolyte and atmospheric carbon dioxide, thereby maintaining ionic conductivity while allowing easy handling and transportation of the composite material.
Solution Approach 2:
The patent uses a matrix material forming a protective shell or coating around sulfide electrolyte particles. This thin film structure provides effective protection against carbonation while maintaining the mechanical integrity and handleability of the electrolyte material for transportation and processing.
3Ease of manufacture
If solid sulfide electrolytes are processed to reduce particle size for better mixing with polymeric binders, then ease of manufacture is improved, but dust generation increases creating safety hazards
Solution Approach 1:
The patent applies this principle by coating solid sulfide electrolyte particles with a polymeric binder to form a flexible shell or coating. This coating reduces dust generation during handling and processing while maintaining the particles' ability to mix effectively with the polymeric binder for electrode or electrolyte layer fabrication.
Solution Approach 2:
The patent creates a composite structure where sulfide electrolyte particles are embedded in or coated with polymeric material. This composite approach reduces dust hazards by binding fine particles together while preserving the manufacturing advantages of reduced particle size for better mixing and processing.
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 composition achieves low H2S emission, improved mechanical stability, and high ionic conductivity, facilitating safe handling and prolonged battery life by minimizing dust and carbonation effects.
Implementation Method 1
solid sulfide electrolytes of formula Li6PS5X wherein X is an halogen are advantageous for lithium battery applications due to their high ionic conductivities
Implementation Method 2
A composition comprising lithium sulfide (Li2S), diphosphorus pentasulfide (P2S5), and lithium halides, calcined and sieved
Data Source
AI summary
The invention relates to a Composition comprising or consisting essentially of a product according to formula (I): LiaPSbXc (I) wherein—X represents at least one halogen element; —a represents a number from 2.0 to 7.0; —b represents a number from 3.5 to 6.0; and—c represents a number from 0 to 3.0; in the form of particles or articles the size of which being such that less than 10 wt % of the composition pass through a sieve of 200 μm.