Journal
JOURNAL OF POWER SOURCES
Volume 474, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2020.228479
Keywords
Graphitized carbon fibers; Electrospinning; Free-standing; Anode; Superior cyclability; Potassium-ion batteries
Funding
- National Natural Science Foundation of China [NSFC 51877216, NSFC21576158]
- Taishan Scholar Foundation [tsqn20161017, tsqn201812063]
- Major Program of Shandong Province Natural Science Foundation [ZR201801280009]
- Fundamental Research Funds for the Central Universities [18CX05007A, 19CX05001A, 19CX05002A]
- Natural Science Foundation of Shandong Province [ZR2017JL014]
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Potassium-ion batteries (PIBs) are in the spotlight as a possible alternative to lithium-ion batteries. Graphitic carbons are promising anode materials for PIBs due to their low-plateau potential that is beneficial for the realization of high-voltage full cells. However, inferior cycling stability hinders their practical application. Herein, highly graphitized carbon nanofibers (HG-CNFs) as a free-standing electrode are served as the anode for PIBs. The HG-CNFs exhibits a reversible capacity of 200 mAh g(-1) at the plateau potential below 0.2 V (76% of total capacity) and superior rate performance with a depotassiation capacity of 226 mAh g(-1) at 35 C. Moreover, the capacity decay of HG-CNFs is less than 0.008% per cycle during 400 cycles, which is superior to those of most other graphitic carbons. The excellent electrochemical performance of HG-CNFs is attributed to its merits of freestanding fibrous networks and graphitic structure with rational defects that alleviate the volume expansion incurred by K+ intercalation.
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