Covalent Organic Framework as an Efficient Protection Layer for a Stable Lithium-Metal Anode
Jiarui He1, Amruth Bhargav1, Arumugam Manthiram1
1Materials Science and Engineering Program & Texas Materials Institute, The University of Texas at Austin, Austin, TX 78712, USA.
Angewandte Chemie (International Ed. in English)
|February 21, 2022
Summary
A novel covalent organic framework (COF) layer on lithium metal anodes prevents lithium dendrite growth. This breakthrough enables stable, high-energy-density rechargeable batteries with extended cycle life.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Lithium metal anodes offer high energy density for rechargeable batteries.
- Lithium dendrite formation and unstable solid-electrolyte interphase (SEI) hinder practical application.
Purpose of the Study:
- To develop a method for suppressing lithium dendrite growth and side reactions on lithium metal anodes.
- To enhance the stability and cycle life of lithium metal batteries.
Main Methods:
- In situ fabrication of a thin covalent organic framework (COF) layer on lithium metal (COF-Li).
- Utilizing the periodic and uniform porosity of the COF for selective ion sieving and deposition guidance.
Main Results:
- The COF-Li anode demonstrated suppressed lithium dendrite morphology during repeated plating/stripping.
- Achieved remarkable cycle life exceeding 13,200 hours.
- Exhibited an ultra-low overpotential of 16 mV at 10 mA cm⁻².
- Supported a high areal capacity of 10 mAh cm⁻².
Conclusions:
- The COF layer effectively mitigates lithium dendrite growth and side reactions.
- COF-Li anodes show significant potential for developing stable, high-performance lithium metal batteries.
- This approach offers a promising strategy for next-generation energy storage solutions.
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