Sulfide Solid Electrolyte Glass for High Conductivity
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Solution Overview
Problem
Current lithium batteries rely on flammable organic solvents in liquid electrolytes, necessitating safety devices and complex structures, while solid electrolytes with high Li ion conductivity are sought for safer and more productive batteries, particularly for electric vehicles.
Innovation Solution
A sulfide solid electrolyte material with high Li ion conductivity is developed, comprising an ion conductor with an ortho-composition and LiI, which is glassy with a glass transition point, allowing for improved Li ion conductivity and chemical stability, and is used in lithium solid state batteries with cathode active materials above 2.8 V.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If liquid electrolyte with flammable organic solvent is used, then Li ion conductivity is achieved, but safety issues arise requiring safety devices and complex structure
Solution Approach 1:
The patent extracts and eliminates the flammable organic solvent from the electrolyte system, replacing it with a solid electrolyte layer composed of inorganic materials. This removes the safety hazard while maintaining ionic conductivity function, directly resolving the contradiction between safety and structural complexity.
Solution Approach 2:
The patent changes the physical state parameter of the electrolyte from liquid to solid, and changes the chemical composition from organic to inorganic. This fundamental parameter change eliminates flammability while enabling simpler battery结构设计, resolving the safety-structure complexity contradiction.
2Reliability
If solid electrolyte material is used to replace liquid electrolyte, then safety is improved and structure is simplified, but Li ion conductivity may be reduced
Solution Approach 1:
The patent employs composite solid electrolyte materials combining multiple inorganic components (e.g., Li2SiO3, Li2SiO2S, Li3PO4) to achieve both high safety and high Li ion conductivity. The composite structure leverages synergistic effects of different materials to simultaneously improve ionic conductivity while maintaining the safety advantages of solid electrolytes.
Solution Approach 2:
The patent optimizes parameters such as composition ratios, particle size distribution, and sintering conditions to enhance Li ion conductivity of solid electrolytes. By carefully controlling these parameters, the patent achieves conductivity levels comparable to or exceeding liquid electrolytes while maintaining the inherent safety benefits.
3Use of energy by moving object
If sulfide solid electrolyte material is used, then Li ion conductivity is enhanced for higher output, but chemical stability may be compromised
Solution Approach 1:
The patent creates composite sulfide-based solid electrolytes that combine sulfide components (providing high ionic conductivity) with oxide or other stable components (providing chemical stability). This composite approach allows the system to achieve high Li ion conductivity for higher power output while the stable components prevent unwanted chemical reactions and decomposition.
Solution Approach 2:
The patent introduces intermediary stable compounds that act as buffers between the sulfide electrolyte and electrode materials. These intermediary layers prevent direct harmful reactions between sulfide and electrodes while allowing efficient Li ion transport, thus maintaining both high conductivity and chemical stability.
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 sulfide solid electrolyte material enhances Li ion conductivity and chemical stability, enabling high-output lithium solid state batteries with reduced reaction resistance and oxidative decomposition, thus addressing safety and productivity concerns.
Implementation Method 1
a sulfide solid electrolyte material with high Li ion conductivity
Data Source
AI summary
The main object of the present invention is to provide a sulfide solid electrolyte material with high Li ion conductivity. The present invention solves the problem by providing a sulfide solid electrolyte material comprising an ion conductor with an ortho-composition, and LiI, characterized in that the sulfide solid electrolyte material is glass with a glass transition point.