Halogen-Modified Sulfide Solid Electrolyte for High Conductivity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing sulfide-based solid electrolyte materials for all-solid-state lithium batteries suffer from low ionic conductivity due to high phosphorus content, which hampers battery performance.
Innovation Solution
A material comprising lithium (Li), silicon (Si), phosphorus (P), sulfur (S), and a halogen (X, where X is F, Cl, Br, or I) is developed, prepared by mixing dry powders of Li2S, MS2, P2S5, and LiX, followed by milling and heating under controlled conditions to enhance ionic conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high phosphorus content is used in sulfide-based solid electrolyte materials, then the material structure is stabilized, but ionic conductivity decreases
Solution Approach 1:
The patent changes the chemical composition parameters by introducing halogen elements (F, Cl, Br, I) to replace部分 sulfur atoms in the Li-M-P-S-X system. This parameter change modifies the crystal structure and bonding characteristics, enabling the material to achieve both structural stability and high ionic conductivity simultaneously, resolving the contradiction between structure stabilization and ionic conductivity enhancement
Solution Approach 2:
The patent creates a composite electrolyte material by combining multiple elements (Li, M, P, S, and halogen X) in specific ratios. The composite structure leverages the complementary properties of each element: Li provides ionic conductivity, M (Si/Ge/Sn) stabilizes the crystal structure, P forms the backbone framework, S provides sulfide bonding, and halogen X enhances both structure and conductivity. This composite approach resolves the contradiction by integrating multiple functional components
2Ease of manufacture
If conventional sulfide-based electrolyte materials are used, then manufacturing is simplified, but battery output is limited due to low ionic conductivity
Solution Approach 1:
The patent modifies the compositional parameters of conventional sulfide electrolytes by adding halogen elements and adjusting the M/P/S/X ratios. These parameter changes significantly enhance ionic conductivity (achieving ≥10^-3 S/cm at room temperature), which directly increases battery output power while maintaining compatibility with existing manufacturing processes for solid electrolyte fabrication
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 resulting material exhibits improved ionic conductivity, leading to higher battery output and performance, specifically in lithium batteries, by optimizing the crystal structure and conductivity properties.
Implementation Method 1
heating under controlled conditions to enhance ionic conductivity
Data Source
AI summary
The present disclosure relates to a material containing the elements Li, M, P, S and X wherein M=Si, Ge or Sn, and X=F, Cl, Br or I. The material can be used as a sulfide solid electrolyte material, notably for an all-solid-state lithium battery.