Two-dimensional carbazole-based COFs for high-performance lithium-sulfur batteries
Yuchen Xiao1,2,3, Shanyue Wei1,2,4, Xuan Wang1,2,4
1State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China. xmwuxiaowei@fjirsm.ac.cn.
Chemical Communications (Cambridge, England)
|October 14, 2024
Summary
Carbazole-based covalent organic frameworks (COFs) were used as sulfur hosts in lithium-sulfur batteries. These materials significantly improved battery performance by reducing polysulfide shuttling and enhancing stability.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Lithium-sulfur batteries (LSBs) offer high theoretical energy density but suffer from the polysulfide shuttle effect.
- Developing effective sulfur hosts is crucial for improving LSB performance and cycle life.
Purpose of the Study:
- To synthesize carbazole-based covalent organic frameworks (COFs).
- To investigate the application of these COFs as sulfur hosts in LSB cathodes.
- To evaluate the electrochemical performance and stability of LSBs utilizing carbazole-based COFs.
Main Methods:
- Synthesis of carbazole-based COFs.
- Fabrication of cathode materials incorporating COFs for LSBs.
- Electrochemical testing, including initial capacity, cyclic performance, and stability analysis.
Main Results:
- Carbazole-based COFs effectively mitigated the shuttle effect of lithium polysulfides.
- A high initial capacity of 1232 mAh g-1 at 0.1C was achieved.
- Excellent capacity retention and stability were observed during cyclic experiments.
Conclusions:
- Carbazole-based COFs show great promise as sulfur hosts for advanced lithium-sulfur batteries.
- The developed materials significantly enhance the electrochemical performance and durability of LSBs.
- This study underscores the potential of carbazole-based COFs in next-generation energy storage solutions.
