Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 50, Pages 60373-60383Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c19705
Keywords
carborane; covalent organic framework; lithium-sulfur batteries; shuttle effect; amphiphilicity; polysulfides
Funding
- National Natural Science Foundation of China [22005141]
- Nanjing Tech University [39837121, 3983500183]
- SICAM Fellowship from the Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing Tech University
- School of Chemistry and Molecular Engineering, Nanjing Tech University
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By synthesizing a CB-COF material as nano-trappers to suppress the shuttle effect caused by polysulfide, the cyclic stability and electrochemical performance of lithium-sulfur batteries have been effectively improved.
Lithium-sulfur batteries (LSBs) have been considered as one of the most promising energy storage systems because of their high theoretical energy density. However, the shuttle effect caused by polysulfide results in poor cycling stability and low electrochemical properties, which strongly impedes the practical application of LSBs. Herein, a kind of amphiphilic carborane-based covalent organic framework (CB-COF) is synthesized and treated as nano-trappers for polysulfide. The microporous CB-COFs show high-temperature resistance and excellent chemical stability. Both experimental results and theoretical calculation indicate the strong adsorption ability of CB-COF for polysulfides. Such an ability makes CB-COF a candidate separator material for LSBs, which efficiently suppresses the shuttle effect, leading to a high-rate capacity (314 mA h g(-1) after 1000 cycles at 2.5 C) and an ultra-long cycling life (after 1000 cycles with a very low decay rate of 0.0395% per cycle at 1 C) of LSBs.
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