Hydrophobic Ionic Liquid Coating for Lithium Metal Anodes
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Solution Overview
Problem
Lithium metal batteries face commercial viability issues due to cell cycling problems, such as dendrite growth and mossy deposits, which lead to internal short circuits and reduced cycle life, especially in liquid electrolyte systems, where existing protective layers are of poor quality and offer limited protection.
Innovation Solution
A hydrophobic, ionically-conductive coating is applied to the metal surface, comprising organic surface moieties covalently bound to the metal and nanoscale ionic liquid materials, which prevents dendrite formation and mossy deposits by creating a protective barrier that allows lithium ion conductivity while preventing electrolyte penetration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protective layer is applied to the lithium negative electrode to prevent dendrite growth and mossy deposits, then the cycle life and reliability of the battery are improved, but the ionic conductivity may be reduced and the manufacturing complexity increases
Solution Approach 1:
The patent applies a protective coating to the lithium negative electrode surface before battery assembly. This preliminary action prevents dendrite and mossy deposit formation from the outset, eliminating the need for post-assembly treatments and simplifying the overall manufacturing process while ensuring long cycle life.
Solution Approach 2:
The protective coating composition and properties are optimized to achieve the right balance between protection and ionic conductivity. By carefully controlling the coating parameters (thickness, composition, structure), the patent maintains high ionic conductivity while providing effective protection against dendrites and mossy deposits.
2Reliability
If a protective layer is applied to the lithium negative electrode to prevent electrolyte penetration, then the reliability is improved, but the ionic conductivity may be reduced
Solution Approach 1:
The protective coating is designed with specific local properties: it forms a dense, uniform layer that blocks electrolyte penetration while maintaining channels or regions that facilitate lithium ion transport. This local differentiation of properties allows simultaneous achievement of high protection quality and ionic conductivity.
Solution Approach 2:
The patent employs composite coating materials that combine protective functions with ionic conductivity. The composite structure integrates components that provide barrier properties against electrolyte while incorporating ion-conductive phases, achieving both protection quality and ionic conductivity.
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 coating significantly extends the cycle life of lithium metal batteries by preventing dendrite growth and maintaining high ionic conductivity, thus enhancing the performance and reliability of rechargeable lithium batteries.
Implementation Method 1
A hydrophobic, ionically-conductive coating is applied to the metal surface
Implementation Method 2
at least one ionic liquid material tethered to at least one surface moiety
Data Source
AI summary
This invention is directed to a hydrophobic, ionically-conductive coating for a metal surface comprising a plurality of organic surface moieties covalently bound to the metal surface, and at least one ionic liquid nanoscale ionic material tethered to at least one surface moiety.