Structure-dependent sodium ion storage mechanism of cellulose nanocrystal-based carbon anodes for highly efficient and stable batteries
Cited 0 times inCited 0 times in
- Structure-dependent sodium ion storage mechanism of cellulose nanocrystal-based carbon anodes for highly efficient and stable batteries
- Kim, Yea Eun; Yeom, Su Jeong; Lee, Jung-Eun; Kang, Sujin; Kang, Haisu; Lee, Ga-Hyeun; Kim, Min Jeong; Lee, Seung Geol; Lee, Hyun-Wook; Chae, Han Gi
- Issue Date
- Elsevier BV
- JOURNAL OF POWER SOURCES, v.468, pp.228371
- 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).
- Appears in Collections:
- MSE_Journal Papers
- Files in This Item:
- There are no files associated with this item.
can give you direct access to the published full text of this article. (UNISTARs only)
Show full item record
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.