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A crystalline carbon nitride-based separator for high-performance lithium metal batteries
Shuanlong Di1,2,3, Hongguan Li2,3, Boyin Zhai1,3
1Department of Chemistry, College of Science, Northeastern University, Shenyang 110819, Liaoning, P. R. China.
Summary
This study introduces a novel crystallinity engineering approach using carbon nitride interlayers to prevent lithium dendrite growth in high-performance batteries, enhancing stability and longevity.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Lithium metal anodes offer high energy density but suffer from dendrite formation, hindering battery performance.
- Conventional separator modifications often focus on surface chemistry or mechanical properties.
Purpose of the Study:
- To develop a new strategy for suppressing lithium dendrite growth using crystallinity engineering of separator interlayers.
- To investigate the role of highly crystalline carbon nitride interlayers in promoting uniform lithium deposition.
Main Methods:
- Utilized molten salt treatment to create highly crystalline carbon nitride interlayers with Cl- intercalation and pyrrolic-N.
- Employed experimental and theoretical methods to analyze Li+ interactions and deposition behavior.
- Tested Li-Li and Li-LiFePO4 full cells with the modified separators.
Main Results:
- The carbon nitride interlayer effectively homogenized lithium flux, leading to uniform lithium deposition.
- Li-Li cells demonstrated ultrahigh stability over 3,000 hours with dendrite-free electrodes.
- Li-LiFePO4 full cells exhibited high-capacity retention.
Conclusions:
- Crystallinity engineering of separators is a viable strategy for suppressing dendrites in lithium metal batteries.
- Highly crystalline carbon nitride interlayers enhance Li+ transport and promote uniform Li deposition.
- This approach broadens the application of C3N4 materials in advanced battery technologies.
