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Focused Ion Beam Fabrication of LiPON-based Solid-state Lithium-ion Nanobatteries for In Situ Testing
Published on: March 7, 2018
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Highly crystalline nanorods pyrene-based covalent organic framework artificial solid electrolyte interface
Zhengyang Gou1, Kaiyang Zheng1, Yaying Dou2
1College of Chemistry and Pharmaceutical Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, China.
Journal of Colloid and Interface Science
|December 1, 2024
Summary
This study introduces dual-functional nanorod covalent organic frameworks (COF) to create a protective layer for lithium metal batteries. This layer enhances ion transport and prevents dendrite growth, improving battery performance and lifespan.
Area of Science:
- Materials Science
- Electrochemistry
- Polymer Chemistry
Background:
- Lithium metal batteries are limited by uneven lithium deposition and dendrite growth.
- A stable artificial solid electrolyte interface (SEI) is crucial for modulating ion transfer.
Purpose of the Study:
- To develop a dual-functional nanorod-shaped covalent organic framework (COF) for an artificial SEI layer.
- To accelerate lithium-ion (Li+) diffusion and suppress lithium dendrite formation.
Main Methods:
- Fabrication of dual-functional nanorod-shaped COF (TFDH-COF).
- Creation of an artificial SEI layer using TFDH-COF on lithium metal.
- Electrochemical performance testing in Li|Cu, Li|Li, and Li-based full cells.
- Ex-situ/in-situ characterizations and Density Functional Theory (DFT) calculations.
Main Results:
- TFDH-COF facilitates uniform Li+ flux and rapid migration via -OH and -CN groups and porous channels.
- The pyrene moiety in TFDH-COF enhances crystallinity and promotes Li+ interaction while repelling TFSI- anions.
- TFDH-COF@Li electrodes show improved Li+ utilization, reduced polarization, a dendrite-free interface, and enhanced cyclic stability.
- DFT calculations and characterizations elucidated the mechanisms for lithium mitigation and Li+ transfer.
Conclusions:
- Neutral COF layers are feasible for preventing disordered lithium deposition.
- The developed TFDH-COF artificial SEI effectively enhances lithium metal battery performance and longevity.
