Halogen-Doped Sulfide Solid Electrolyte for High Ionic Conductivity
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Solution Overview
Problem
Existing Li ion batteries using liquid electrolytes have reached maturity, and there is a need for improved solid-state batteries with high ionic conductivity and processability, particularly in the development of sulfide-based solid electrolytes.
Innovation Solution
A sulfide-based electrolyte composition comprising lithium, phosphorous, and sulfur with specific XRD peaks, optionally including a halogen, is formulated through a mixing and milling process, followed by heating to form a crystallized electrolyte suitable for solid-state batteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If liquid electrolytes are used in Li ion batteries, then the batteries reach maturity and are easy to manufacture, but the ionic conductivity and energy density are limited
Solution Approach 1:
The patent changes the physical state parameter of the electrolyte from liquid to solid, and modifies the chemical composition by incorporating halogen elements (F, Cl, Br, I) into the sulfide-based solid electrolyte structure. This parameter change enables higher ionic conductivity while maintaining manufacturing feasibility through established solid-state battery processes
Solution Approach 2:
The patent creates a composite solid electrolyte material combining sulfide-based compounds with halogen elements. The specific formula Li5+zP3S10Xz (where X is a halogen) represents a composite structure that leverages the high ionic conductivity of sulfides while the halogen component enhances stability and processability, resolving the contradiction between performance and manufacturability
2Quantity of substance
If solid-state batteries are developed to improve ionic conductivity, then the energy density increases, but the manufacturing process becomes more complex
Solution Approach 1:
The patent modifies the chemical composition parameters by introducing halogen elements into the solid electrolyte structure. This composition adjustment enables the material to achieve high ionic conductivity suitable for energy-dense batteries while maintaining compatibility with existing solid-state battery manufacturing processes, thus increasing energy density without proportionally increasing manufacturing complexity
3Reliability
If sulfide-based solid electrolytes are used to achieve high ionic conductivity, then the battery performance improves, but the processability and stability are compromised
Solution Approach 1:
The patent develops a composite material system where halogen elements are integrated into the sulfide-based solid electrolyte structure. The halogen component (F, Cl, Br, or I) stabilizes the crystal structure and improves chemical stability while the sulfide matrix maintains high ionic conductivity, thus achieving both high performance and compositional stability
Solution Approach 2:
The patent adjusts the stoichiometric parameters of the solid electrolyte by varying the halogen content (represented by z in Li5+zP3S10Xz where 0≤z≤5). This parameter optimization allows tuning of both ionic conductivity and chemical stability, achieving a balance where high performance and compositional stability coexist
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 electrolyte composition exhibits high ionic conductivity and processability, enhancing the performance of solid-state batteries.
Implementation Method 1
solid ionically conductive material that are used in forming the negative electrode, positive electrode and separator layers withing the battery
Implementation Method 2
mixing Li2S, P2S5, sulfur, and LiX in the presence of a solvent
Implementation Method 3
followed by heating to form a crystallized electrolyte suitable for solid-state batteries
Data Source
AI summary
The present disclosure provides an electrolyte composition. The disclosure also generally relates to solid state batteries, and electrolyte compositions that may be used in solid state batteries. The disclosure also provides an electrolyte composition comprising lithium, phosphorous, and/or sulfur. The composition may further include a halogen. Without being bound by theory, the disclosure also provides an electrolyte composition comprising a novel x-ray diffraction (XRD) pattern.