Lithium Halide Nanocomposite Electrolyte for Stable Ion Conduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing lithium-ion batteries face issues with low thermal stability, ignitability, and leakage due to the use of organic liquid electrolytes, and sulfide-based solid electrolytes have limitations in electrochemical and atmospheric stability, as well as toxicity and high production costs, while halide-based solid electrolytes face challenges in improving ionic conductivity and interfacial stability.
Innovation Solution
A lithium halide-based nanocomposite is developed, where a nanosized compound selected from M1Oc, LiX, and their combinations are dispersed in a halide compound LiaM2Xb, forming a glass-ceramic crystal structure with enhanced ionic conductivity and interfacial stability, improving the performance of all-solid-state batteries by suppressing side reactions and increasing cycle stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If sulfide-based solid electrolytes are used, then ionic conductivity is improved, but electrochemical stability and atmospheric stability deteriorate
Solution Approach 1:
The patent employs a composite solid electrolyte structure combining sulfide-based electrolyte (providing high ionic conductivity) with halide-based electrolyte and protective coating layers (providing electrochemical and atmospheric stability). This multi-layer composite approach allows each material to contribute its strengths while mitigating its weaknesses through the protective interfaces.
2Reliability
If halide-based solid electrolytes are used, then atmospheric stability is improved, but ionic conductivity deteriorates
Solution Approach 1:
The patent creates a composite electrolyte system where halide-based solid electrolyte provides atmospheric stability while sulfide-based electrolyte components maintain ionic conductivity. The synergistic combination allows the system to achieve both stability and conductivity that neither material could provide alone.
Solution Approach 2:
The patent applies different material compositions to different regions of the electrolyte structure, with halide-based materials positioned where atmospheric stability is critical and sulfide-based materials positioned where ionic conductivity is paramount, optimizing local properties for specific functional requirements.
3Reliability
If rare earth materials are used in halide-based solid electrolytes, then atmospheric stability is improved, but manufacturing cost and toxicity increase
Solution Approach 1:
The patent replaces expensive rare earth materials with more abundant and cost-effective alternative compositions in the halide-based solid electrolyte, achieving comparable atmospheric stability through economically viable materials that reduce both cost and environmental concerns.
Solution Approach 2:
The patent modifies the chemical composition parameters of the halide-based electrolyte by substituting rare earth elements with alternative metal halides and adjusting stoichiometric ratios, thereby maintaining the desired atmospheric stability while significantly reducing material cost and toxicity.
4Reliability
If sulfide and halide-based solid electrolytes are used together, then electrochemical stability is improved, but side reactions occur at high voltage
Solution Approach 1:
The patent introduces protective coating layers and interface engineering between sulfide and halide-based electrolytes that act as intermediaries, preventing direct harmful interactions while allowing beneficial ionic conduction to proceed. These intermediary layers block side reactions at high voltage interfaces.
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 lithium halide-based nanocomposite significantly enhances ionic conductivity, interfacial stability, and high-potential cycle stability, addressing the limitations of existing solid electrolytes and enabling the development of safer and more efficient all-solid-state batteries.
Implementation Method 1
a nanosized compound selected from M1Oc, LiX, and a combination thereof is dispersed in a halide compound of LiaM2Xb
Implementation Method 2
forming a glass-ceramic crystal structure with enhanced ionic conductivity
Implementation Method 3
improve ionic conductivity to the level of sulfide-based materials
Data Source
AI summary
Disclosed are a lithium halide-based nanocomposite, a method of preparing the same, a solid electrolyte including the lithium halide-based nanocomposite, and an all-solid-state battery including the solid electrolyte, the lithium halide-based nanocomposite including a nanosized compound selected from M1Oc, LiX, and a combination thereof dispersed in a halide compound.