Lithium Phosphate Sulfide Solid Electrolyte Synthesis
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Solution Overview
Problem
The development of rechargeable lithium-ion batteries with high energy density and safety is hindered by traditional batteries with flammable liquid electrolytes, and the high interfacial resistance in all-solid-state lithium batteries (ASSLBs) limits their commercialization, particularly due to challenges in synthesizing lithium phosphate sulfide (Li7P3S11) nanoparticles with high Li+ conductivity and controlled particle sizes.
Innovation Solution
A method for synthesizing nanosized lithium phosphate sulfide (LiPS) solid-state electrolytes using a mixture of Li2S and P2S5 with ethyl acetate as a solvent, which allows for the formation of Li7P3S11 nanoparticles with controlled diameters and high Li+ conductivity by dissolving the precursors in ethyl acetate, evaporating the solvent, and heating to produce a solid state electrolyte with enhanced properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional liquid electrolytes are used in lithium-ion batteries, then high ionic conductivity is achieved, but safety deteriorates due to flammability
Solution Approach 1:
The patent changes the physical state of the electrolyte from liquid to solid by using lithium phosphate sulfide (LiPS) materials, specifically achieving Li+ conductivity of at least 0.7 mS cm−1 in solid state, thereby maintaining high ionic conductivity while eliminating flammability risks
Solution Approach 2:
The patent employs composite material strategies by combining LiPS nanoparticles with other materials to create solid electrolyte compositions that achieve both high Li+ conductivity and enhanced safety, replacing traditional flammable liquid electrolytes entirely
2Reliability
If lithium phosphate sulfide nanoparticles are synthesized to reduce particle size, then interfacial resistance decreases, but manufacturing precision deteriorates due to difficulty in controlling particle sizes
Solution Approach 1:
The patent achieves precise particle size control (50 nm to 1000 nm) by optimizing synthesis parameters including precursor ratios, solvent selection (ethyl acetate), temperature, and time, thereby reducing interfacial resistance while maintaining manufacturing precision
Solution Approach 2:
The patent replaces mechanical ball milling methods with a chemical synthesis approach using ethyl acetate as solvent, enabling better control over nanoparticle size distribution and reducing interfacial resistance through more precise size control
3Productivity
If conventional synthesis methods are used for Li7P3S11, then production is simplified, but productivity deteriorates due to inability to produce nanosized particles with high conductivity
Solution Approach 1:
The patent achieves high productivity of nanosized Li7P3S11 particles with controlled sizes (50-1000 nm) and high Li+ conductivity by optimizing synthesis parameters including precursor concentration (5-40 mg ml−1), solvent type (ethyl acetate), temperature, and time, enabling scalable production
4Productivity
If high concentration of precursors is used in solution, then productivity improves, but manufacturing precision deteriorates due to difficulty in controlling particle size distribution
Solution Approach 1:
The patent optimizes precursor concentration in ethyl acetate solution to achieve the best balance between productivity and particle size control, producing uniform nanoparticles with sizes from 50 nm to 1000 nm and high Li+ conductivity of at least 0.7 mS cm−1
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 method achieves Li7P3S11 nanoparticles with diameters from 50 nm to 1000 nm and Li+ conductivity of at least 0.7 mS cm−1, addressing the challenges of interfacial resistance and energy density in ASSLBs, and is scalable with a suitable solvent that reduces binding energy and improves particle size control.
Implementation Method 1
combining precursors with an organic solvent to provide a composition; mixing the composition at a dissolving temperature for an effective period of time to fully dissolve the precursors and form a solution
Implementation Method 2
evaporating the solvent at an evaporating temperature to produce a solid composition
Implementation Method 3
heating the solid composition at a heating temperature for a heating time to produce a final product
Data Source
AI summary
Nanosized lithium phosphate sulfide solid state electrolytes are synthesized by a facile method using ethyl acetate as the solvent. SSE compositions comprising nanosized lithium phosphate sulfide synthesized using the methods include particles having an average diameter of from 50 nm to 1000 nm. The nanosized lithium phosphate sulfide has a formula LixPySz, wherein 3≤x ≤7, 1≤y≤3, and 4≤z≤11.