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Structural properties and electrochemical performance of different polymorphs of Nb2O5 in magnesium-based batteries
- Source :
- Journal of Energy Chemistry. 58:586-592
- Publication Year :
- 2021
- Publisher :
- Elsevier BV, 2021.
-
Abstract
- The selection of the most suitable crystal structure for ions storage and the investigation of the corresponding reaction mechanism is still an ongoing challenge for the development of Mg-based batteries. In this article, high flexible graphene network supporting different crystal structures of Nb2O5 (TT-Nb2O5@rGO and T-Nb2O5@rGO) are successfully synthesized by a spray-drying-assisted approach. The three-dimensional graphene framework provides high conductivity and avoids the aggregation of Nb2O5 nanoparticles. When employed as electrode materials for energy storage applications, TT-Nb2O5 delivers a higher discharge capacity of 129.5 mAh g−1, about twice that of T-Nb2O5 for Mg-storage, whereas, T-Nb2O5 delivers a much higher capacity (162 mAh g−1) compared with TT-Nb2O5 (129 mAh g−1) for Li-storage. Detailed investigations reveal the Mg intercalation mechanism and lower Mg2+ migration barriers, faster Mg2+ diffusion kinetics of TT-Nb2O5 as cathode material for Mg-storage, and the faster Li+ diffusion kinetics, shorter diffusion distance of T-Nb2O5 as cathode material for Li-storage. Our work demonstrates that exploring the proper crystal structure of Nb2O5 for different ions storage is necessary.
- Subjects :
- Reaction mechanism
Materials science
Graphene
Diffusion
Intercalation (chemistry)
Energy Engineering and Power Technology
Nanoparticle
02 engineering and technology
Crystal structure
010402 general chemistry
021001 nanoscience & nanotechnology
Electrochemistry
01 natural sciences
Energy storage
0104 chemical sciences
law.invention
Fuel Technology
Chemical engineering
law
0210 nano-technology
Energy (miscellaneous)
Subjects
Details
- ISSN :
- 20954956
- Volume :
- 58
- Database :
- OpenAIRE
- Journal :
- Journal of Energy Chemistry
- Accession number :
- edsair.doi...........50d3d349440ea8bedf1ffff20af496e4