Journal
APPLIED SURFACE SCIENCE
Volume 506, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2019.144909
Keywords
Nitrogen-doped; Sodium ion battery (NaIB); Potassium ion battery (KIB); Porous carbon; Activation-free
Categories
Funding
- Equipment Pre-research Field Fund [61409220110]
- National Defense Science and technology innovation special zone projects [18-163-21-TS-001-046-01]
- Sichuan Science and Technology Programs [2018GZ0134, 2018GZ0006, 18ZDYF1556]
- Fundamental Research Funds for the Central Universities [ZYGX2019Z022]
- horizontal project of Feng Hua Gao Xin [180637]
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Carbonaceous materials show more and more obvious applications in potassium (K) ion battery (KIB) and sodium (Na) ion battery (NaIB) because K and Na have higher reserves than lithium (Li). However, the rate performance and cycle stability of KIBs and NaIBs are still hindered by huge volume change during ions insertion-extraction process and poor kinetics caused by larger volume of K(+)and Na+ ions. Compared to graphite and hard carbon, nitrogen (N)-doped porous carbonaceous materials may provide good interfacial wettability and numerous ion transport channels, but low first coulombic efficiency is detrimental to the application of full-battery. Here, N-doped porous carbon (NPC) with a providential specific surface area is synthesized by a facile and activation-free way. Benefiting from N-doping and porous structure, KIBs and NaIBs display an enhanced rate capacity and cycle performance. The storage mechanism and kinetic characteristics of K and Na ion during charge and discharge are also discussed. Comprehensive performance indicates that NPC can obtain a better improvement in surface-driven KIBs than intercalation dominated NaIBs, and can provide some new design concepts for practical applications.
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