BROWSE

Related Researcher

Author's Photo

Lee, Hyun-Wook
Energy Storage and Electron Microscopy Laboratory
Research Interests
  • Energy storage, secondary batteries, transmission electron microscopy, real time analysis

ITEM VIEW & DOWNLOAD

Structure-dependent sodium ion storage mechanism of cellulose nanocrystal-based carbon anodes for highly efficient and stable batteries

Cited 0 times inthomson ciCited 0 times inthomson ci
Title
Structure-dependent sodium ion storage mechanism of cellulose nanocrystal-based carbon anodes for highly efficient and stable batteries
Author
Kim, Yea EunYeom, Su JeongLee, Jung-EunKang, SujinKang, HaisuLee, Ga-HyeunKim, Min JeongLee, Seung GeolLee, Hyun-WookChae, Han Gi
Issue Date
2020-08
Publisher
Elsevier BV
Citation
JOURNAL OF POWER SOURCES, v.468, pp.228371
Abstract
We herein report the preparation of SIBs using carbon anodes based on spray-dried cellulose nanocrystals (CNCs) carbonized over a wide temperature range (i.e., 800–2500 °C). The structural variations in the CNC-based carbon anodes are correlated with the sodiation mechanism by investigating the galvanostatic voltage profiles, and it is found that Na ion adsorption takes place in the less-ordered carbonaceous structures followed by intercalation into the more ordered internal carbon structure with an average interlayer spacing of >0.37 nm. Among the various anodes examined, the CNCs carbonized at 1500 °C (C1500) deliver the highest reversible specific capacity of 311 mA h g−1 at a current density of 10 mA g−1, and exhibit an outstanding rate capability (273 mA h g−1 at 400 mA g−1). In addition, they also possess an excellent specific capacity retention of 92.3% even after 400 cycles at 100 mA g−1, along with an initial coulombic efficiency of 85%. Density functional theory (DFT) calculation exhibits that the energy barrier for Na ion intercalation of C1500 (0.20 eV) is almost a half that of the CNCs carbonized at 2500 °C (0.39 eV).
URI
https://scholarworks.unist.ac.kr/handle/201301/32312
URL
https://www.sciencedirect.com/science/article/pii/S0378775320306753
DOI
10.1016/j.jpowsour.2020.228371
ISSN
0378-7753
Appears in Collections:
MSE_Journal Papers
ECHE_Journal Papers
Files in This Item:
There are no files associated with this item.

find_unist can give you direct access to the published full text of this article. (UNISTARs only)

Show full item record

qrcode

  • mendeley

    citeulike

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

MENU