Back to Search
Start Over
In Situ Confined Co 5 Ge 3 Alloy Nanoparticles in Nitrogen-Doped Carbon Nanotubes for Boosting Lithium Storage.
- Source :
-
ACS applied materials & interfaces [ACS Appl Mater Interfaces] 2020 Oct 14; Vol. 12 (41), pp. 46247-46253. Date of Electronic Publication: 2020 Sep 29. - Publication Year :
- 2020
-
Abstract
- Ge-based materials have garnered much attention in lithium-ion batteries (LIBs) for their high theoretical capacity, but these materials suffer from huge volume changes and serious pulverization, which cause insufficient lithium storage performance. Herein, a composite composed of Co <subscript>5</subscript> Ge <subscript>3</subscript> - and nitrogen-doped carbon nanotube (Co <subscript>5</subscript> Ge <subscript>3</subscript> /N-CNT) was successfully synthesized using ZIF-67 and GeO <subscript>2</subscript> as precursors. There are interactions between the Co <subscript>5</subscript> Ge <subscript>3</subscript> alloy nanoparticles and carbon nanotubes in the growth process, in which the Co <subscript>5</subscript> Ge <subscript>3</subscript> alloy nanoparticles were confined in situ in N-CNTs and the in situ growth of N-CNTs was boosted in the existence of the Co <subscript>5</subscript> Ge <subscript>3</subscript> catalyst. Density functional theory calculations revealed that the electronic conductivity of the Co <subscript>5</subscript> Ge <subscript>3</subscript> alloy is much higher than that of Ge and the Li <superscript>+</superscript> interaction energy of the former is lower than that of the latter. In addition, the interconnected carbon nanotubes not only offer Li <superscript>+</superscript> diffusion pathways and electronic networks but also increase electronic conductivity. Importantly, carbon nanotubes and Co metal have a synergistic effect of buffering volume charge of Ge in the process of Li <superscript>+</superscript> intercalation/deintercalation. As expected, the Co <subscript>5</subscript> Ge <subscript>3</subscript> /N-CNT composite demonstrated a high reversible capacity of 853.7 mA h g <superscript>-1</superscript> at 2 A g <superscript>-1</superscript> after 1500 cycles and attractive rate performance of up to 10 A g <superscript>-1</superscript> .
Details
- Language :
- English
- ISSN :
- 1944-8252
- Volume :
- 12
- Issue :
- 41
- Database :
- MEDLINE
- Journal :
- ACS applied materials & interfaces
- Publication Type :
- Academic Journal
- Accession number :
- 32990421
- Full Text :
- https://doi.org/10.1021/acsami.0c15942