LiPSX-Polymer Composite Electrolyte for Uniform Dendrite Suppression
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Solution Overview
Problem
Existing methods for preparing composite solid electrolytes face challenges in achieving uniform polymer distribution, leading to non-uniform mechanical properties and increased dendrite formation in all-solid-state batteries, particularly when higher polymer loads are used.
Innovation Solution
A low-temperature solution-precipitation process is employed to synthesize lithium phosphorus sulfur halide-polymer composites, ensuring uniform distribution of polymers within the solid electrolyte, thereby suppressing dendrite formation and enhancing mechanical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If mechanical mixing or dispersion methods are used to prepare composite solid electrolytes, then the manufacturing process is simple, but uniform polymer distribution cannot be achieved leading to non-uniform mechanical properties and increased dendrite formation
Solution Approach 1:
The invention changes the processing parameters from mechanical mixing to solution-based processing. The solid electrolyte is dissolved in a solvent to form a homogeneous solution, which is then cast and dried to form a uniform composite film. This parameter change from solid-state mixing to solution-state processing enables molecular-level uniformity in polymer distribution while maintaining ease of manufacture through simple solution casting techniques.
Solution Approach 2:
The invention introduces a solvent as an intermediary medium to achieve uniform polymer distribution. The solvent acts as a carrier that enables the solid electrolyte and polymer to mix at the molecular level in solution, eliminating the non-uniformity inherent in direct mechanical mixing. After casting, the solvent is removed, leaving a uniformly distributed composite structure without requiring complex mixing equipment or procedures.
2Reliability
If higher polymer loads are used in composite solid electrolytes, then the dendrite suppression capability is improved, but phase separation occurs weakening mechanical strength
Solution Approach 1:
The invention changes the state parameter of the polymer composite from solid混合 to solution-cast film. By processing the solid electrolyte and polymer in solution form, the system can accommodate higher polymer loads without phase separation. The solution state allows for homogeneous mixing at the molecular level, and upon drying, forms a uniform solid film that maintains mechanical integrity even with high polymer content, thereby suppressing dendrites while preserving strength.
3Object-affected harmful factors
If solid electrolyte density is increased to minimize grain boundaries, then dendrite formation along grain boundaries is reduced, but electronic conduction increases causing dendrite growth inside the solid electrolyte
Solution Approach 1:
The invention creates a composite solid electrolyte by combining the inorganic solid electrolyte (dissolved in solvent) with an organic polymer matrix. This composite structure provides dual benefits: the solid electrolyte particles maintain high ionic conductivity while the polymer matrix provides electronic insulation. The composite prevents electronic conduction pathways that would occur in dense single-phase solid electrolytes, thereby suppressing internal dendrite growth while maintaining resistance to grain boundary dendrites through the uniform composite structure.
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 solution-precipitation method results in improved ionic conductivity and mechanical properties, effectively preventing dendrite formation and stabilizing the electrolyte interface, even at higher polymer loads.
Implementation Method 1
LiPSCl and a polymer are precipitated by mixing the LiPSCl solution and the polymer solution
Implementation Method 2
The solvent is removed to form a polymer composite solid electrolyte
Data Source
AI summary
This disclosure provides systems, methods, and apparatus related to lithium phosphorus sulfide halide-polymer composites. In one aspect, a lithium phosphorus sulfur halide (LiPSX) solution and a polymer solution are provided. X is chlorine, bromine, iodine, or combinations thereof. LiPSX of the LiPSX solution and a polymer of the polymer solution are precipitated by mixing the LiPSX solution and the polymer solution. A LiPSX solvent of the LiPSX solution and a polymer solvent of the polymer solution are removed from the LiPSX and the polymer to form polymer-embedded LiPSX.