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Anchoring NiO Nanosheet on the Surface of CNT to Enhance the Performance of a Li-O 2 Battery.
- Source :
- Nanomaterials (2079-4991); Jul2022, Vol. 12 Issue 14, pN.PAG-N.PAG, 11p
- Publication Year :
- 2022
-
Abstract
- Li<subscript>2</subscript>O<subscript>2</subscript>, as the cathodic discharge product of aprotic Li-O<subscript>2</subscript> batteries, is difficult to electrochemically decompose. Transition-metal oxides (TMOs) have been proven to play a critical role in promoting the formation and decomposition of Li<subscript>2</subscript>O<subscript>2</subscript>. Herein, a NiO/CNT catalyst was prepared by anchoring a NiO nanosheet on the surface of CNT. When using the NiO/CNT as a cathode catalyst, the Li-O<subscript>2</subscript> battery had a lower overpotential of 1.2 V and could operate 81 cycles with a limited specific capacity of 1000 mA h g<superscript>−1</superscript> at a current density of 100 mA g<superscript>−1</superscript>. In comparison, with CNT as a cathodic catalyst, the battery could achieve an overpotential of 1.64 V and a cycling stability of 66 cycles. The introduction of NiO effectively accelerated the generation and decomposition rate of Li<subscript>2</subscript>O<subscript>2</subscript>, further improving the battery performance. SEM and XRD characterizations confirmed that a Li<subscript>2</subscript>O<subscript>2</subscript> film formed during the discharge process and could be fully electrochemical decomposed in the charge process. The internal network and nanoporous structure of the NiO/CNT catalyst could provide more oxygen diffusion channels and accelerate the decomposition rate of Li<subscript>2</subscript>O<subscript>2</subscript>. These merits led to the Li-O<subscript>2</subscript> battery's better performance. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20794991
- Volume :
- 12
- Issue :
- 14
- Database :
- Complementary Index
- Journal :
- Nanomaterials (2079-4991)
- Publication Type :
- Academic Journal
- Accession number :
- 158299446
- Full Text :
- https://doi.org/10.3390/nano12142386