期刊
ACS APPLIED MATERIALS & INTERFACES
卷 13, 期 35, 页码 41628-41636出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c10870
关键词
covalent organic frameworks; alkynes; energy storage; potassium-ion batteries; organic electrodes
资金
- National Science Foundation [CBET-2037707]
- Ohio State University (OSU) Campus Chemical Instrument Center (CCIC)
This study explores the use of alkynyl-based COFs as bulk anode materials for KIBs, achieving high performance under localized high-concentration electrolyte conditions. TAEB-COF displays high capacity and efficiency, while DBA-COF 3 also exhibits good cycling performance.
The development of high-performance organic electrodes for potassium-ion batteries (KIBs) is attracting interest due to their sustainability and low costs. However, the electrolyte systems and moieties that generally proved to be successful in high-performance Li-ion batteries have found relatively little success in KIBs. Herein, two alkynyl-based covalent organic frameworks (COFs) containing 1,3,5-tris(arylethynyl)benzene (TAEB) and dehydrobenzoannulene (DBA) units are utilized as bulk anode materials for KIBs in a localized high-concentration electrolyte. TAEB-COF provides a high capacity value of 254.0 mAh g(-1) at similar to 100% efficiency after 300 cycles, and DBA-COF 3 provides a capacity of 76.3 mAh g(-1) with 98.7% efficiency after 300 cycles. DFT calculations suggest that the alkynyl units of TAEB-COF facilitate the binding of K-ions through both enthalpic and geometric driving forces, leading to high reversible capacities.
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