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Few-Layered Fluorinated Triazine-Based Covalent Organic Nanosheets for High-Performance Alkali Organic Battery.

07:00 EST 3rd December 2019 | BioPortfolio

Summary of "Few-Layered Fluorinated Triazine-Based Covalent Organic Nanosheets for High-Performance Alkali Organic Battery."

In order to fulfill the increasing demand for renewable energy, besides the lithium-ion batteries, other alkali (Na, K)-ion batteries are extensively investigated. But the difficulty to find universal and environmentally-benign electrodes for these alkali (Na, K)-ion batteries still severely restricts their development. The promising characteristics including molecular diversity, low cost, and operation safety endow the organic electrodes more advantages for applications in alkali-ion batteries. However, organic electrodes usually deliver smaller reversible capacity than their inorganic counterparts due to sluggish ion/electron diffusion and possible dissolution in organic electrolytes. This work introduces fluorine atoms into the covalent triazine frameworks (CTF) to obtain two-dimensional layered fluorinated CTF (FCTF) and its exfoliated few-layered product (E-FCTF), and uses them as anodes of Li, Na and K organic batteries. Exfoliated E-FCTF electrode delivers high reversible capacities, as well as excellent cycle life for alkali organic batteries (1035 mAh g-1 at 100 mA g-1 after 300 cycles and 581 mAh g-1 at 2 A g-1 after 1000 cycles for lithium organic batteries). In view of the experimental probing and the theoretical calculation, the Li-storage mechanism for the E-FCTF can be determined to be an intriguing multi-electronic redox reaction originated from the lithium-storage on the benzene ring and triazine ring units.

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This article was published in the following journal.

Name: ACS nano
ISSN: 1936-086X
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