Sulfide-Based Electrode Composite for Lithium Battery
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Lithium batteries face challenges with the safety of organic-based liquid electrolytes due to flammability, volatility, and leakage, while inorganic-based electrolytes require improved performance and stability, especially in harsh environments.
Innovation Solution
A sulfide-based electrode composite is developed, comprising lithium phosphorus sulfide, lithium metal sulfide, and amorphous sulfide, prepared through a physical pressure process like ball milling, which enhances ionic and electronic conductivity, and is used in conjunction with a solid electrolyte layer to form a high-performance lithium battery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If organic-based liquid electrolyte is used, then ionic conductivity and electrochemical stability are improved, but safety deteriorates due to flammability, volatility, and leakage
Solution Approach 1:
The patent changes the physical state of the electrolyte from liquid to solid by using inorganic solid electrolytes (sulfides, oxides, nitrides) instead of organic liquid electrolytes. This parameter change (liquid→solid) eliminates flammability and volatility while maintaining ionic conductivity through careful selection of inorganic materials with appropriate ionic transport properties
Solution Approach 2:
The patent employs composite material structures combining different inorganic electrolyte materials (e.g., sulfide-based electrodes with solid electrolyte layers) to achieve both high ionic conductivity and enhanced safety. The composite approach allows optimization of individual material properties while achieving overall system performance
2Object-affected harmful factors
If inorganic-based solid electrolyte is used, then safety is improved, but ionic conductivity and performance deteriorate
Solution Approach 1:
The patent optimizes the ionic conductivity parameter of solid electrolytes by selecting specific inorganic materials (sulfides, oxides, nitrides) and controlling their composition, crystal structure, and density. This allows achieving ionic conductivity levels comparable to liquid electrolytes while maintaining the safety advantages of solid materials
Solution Approach 2:
The patent uses composite inorganic electrolyte systems that combine multiple materials to achieve synergistic effects, improving overall ionic conductivity while maintaining safety. The composite structure allows optimization of ion transport pathways through careful material selection and interface engineering
3Ease of manufacture
If physical pressure is applied to prepare electrode composite, then manufacturing complexity is reduced, but manufacturing precision deteriorates
Solution Approach 1:
The patent performs preliminary mixing and pre-compression of electrode materials before final assembly. By preparing the electrode composite mixture in advance with controlled composition and applying gradual pressure stages, the process achieves both ease of manufacture and sufficient structural precision for battery performance
Solution Approach 2:
The patent optimizes pressure application parameters (pressure magnitude, duration, distribution) to achieve the desired electrode composite density and structure. By carefully controlling these parameters, the process maintains simplicity while achieving adequate manufacturing precision for functional performance
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-based electrode composite improves ionic conductivity and charge capacity, achieving higher performance and stability in lithium batteries, with enhanced cycle durability and efficiency.
Implementation Method 1
preparing an electrode composite by applying a physical pressure to the mixture... the lithium metal sulfide and the amorphous sulfide may be prepared by reacting metal sulfide with a lithium element which is included in the mixture, and the reacting of the metal sulfide with the lithium element may be performed by the physical pressure
Data Source
AI summary
A method of preparing a lithium battery according to an embodiment of the present invention may include preparing a mixture including lithium phosphorus sulfide and metal sulfide, preparing an electrode composite by applying a physical pressure to the mixture, wherein the electrode composite includes lithium phosphorus sulfide, lithium metal sulfide, and amorphous sulfide, preparing an electrode active layer by using the electrode composite, forming an electrode current collector on one side of the electrode active layer, and forming an electrolyte layer on another side of the electrode active layer.