Journal
CHEMICAL ENGINEERING JOURNAL
Volume 384, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2019.123328
Keywords
Honeycomb; Nitrogen-doped carbon; Potassium-ion batteries; Enlarged spacing; Superior electrochemical performances
Categories
Funding
- China Postdoctoral Science Foundation [2019M652876]
- Science and Technology Planning Project of Guangdong Province, China [2017B090916002]
- National Natural Science Foundation of China [51872098]
- Guangdong Natural Science Funds for Distinguished Young Scholar [2016A030306010]
- Guangdong Innovative and Entrepreneurial Research Team Program [2014ZT05N200]
- Natural Science Foundation of Guangdong Industry Polytechnic [KJPY2018-007]
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Potassium-ion batteries (PIBs) have caused great concern owing to their low cost and the reserve-abundance of potassium, but a critical limitation in PIBs anodes is the low capacity for efficient intercalation/de-intercalation of K ions with a larger size. Herein, we successfully synthesize a nitrogen-doped carbon with a honeycomb architecture (cellular N-C) via directed growth of metal-organic frameworks (MOFs) on the surfaces of LDHs nanosheets followed by the pyrolysis and acid-etching processes. The resulting cellular N-C material exhibits promising PIBs anode activity, which is superior to the N-doped carbon (N-C) derived directly from MOFs. Through the structure design, compared with the N-C, the cellular N-C has the characteristics of finely controlled honeycomb-like morphology with higher specific surface area, well-distributed hierarchical micro/meso/macropores, and expanded interlayer distance. These features can greatly facilitate the K+ diffusion kinetics and make the electrode materials accommodate more K ions. Therefore, the cellular N-C electrode can deliver outstanding rate capability up to 10 A g(-1) and great cycling performance at 1 A g(-1) over 2000 cycles (143 mAh g(-1)).
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