1. Graphitized electrospun carbon fibers with superior cyclability as a free-standing anode of potassium-ion batteries.
- Author
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Tian, Shuang, Jiang, Qingting, Cai, Tonghui, Wang, Yesheng, Wang, Dandan, Kong, Dongqing, Ren, Hao, Zhou, Jin, and Xing, Wei
- Subjects
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CARBON fibers , *ANODES , *ELECTRIC batteries , *LITHIUM-ion batteries , *CARBON nanofibers , *MERCURY , *ELECTRODES - Abstract
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 free-standing fibrous networks and graphitic structure with rational defects that alleviate the volume expansion incurred by K+ intercalation. • Highly graphitized carbon nanofibers as a free-standing electrode was prepared. • The interconnected networks improve the integrity and buffer the volume expansion. • The HG-CNFs exhibits a capacity of 200 mAh g−1 at the plateau potential below 0.2 V. • The HG-CNFs shows outstanding cycling performance in K-ion half-cells. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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