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N-doped graphene wrapped SnP2O7 for sodium storage with high pseudocapacitance contribution.
- Source :
-
Journal of Alloys & Compounds . Feb2021, Vol. 854, pN.PAG-N.PAG. 1p. - Publication Year :
- 2021
-
Abstract
- Developing advanced electrode materials for sodium storage is hindered by the sluggish Na+ diffusion kinetics and terrible structure damage. Pseudocapacitance is believed as a promising solution to supply fast, large and stable sodium storage via surface-controlled behavior. Herein, a hybrid material approach is implemented to pursue pseudocapacitance contributed sodium storage by constructing nitrogen-doped graphene nanosheets packed SnP 2 O 7 particles. The rationally selected components and specific structure also provide advantages for electrolyte penetration and Na+ diffusion, fast charge transfer, and structure stability. Hence, the developed composite delivers anode performances for sodium storage with high capacity of 423 mAh g−1 at 0.1 A g−1, good rate performance of 206 mAh g−1 at 2 A g−1, and stable cyclic property (retention rate of ∼95% after 1000 cycles at 1 A g−1). Pseudocapacitance contribution is vital for the composite electrode, especially at high rate, dedicating a percentage as high as 89% to the total capacity at a sweep rate of 1 mV s−1. This work demonstrates the promising potential of compositing graphene and conversion reaction material as pseudocapacitive electrode for sodium ion batteries. • N-doped graphene wrapped SnP 2 O 7 particles is prepared as SIBs anode. • Composition and structure characteristics benefit sodium storage. • Pseudocapacitive dominated sodium storage is acquired. • Large/fast sodium storage with excellent stability is obtained. [ABSTRACT FROM AUTHOR]
- Subjects :
- *SODIUM ions
*GRAPHENE
*STORAGE batteries
*DIFFUSION kinetics
*CHARGE transfer
Subjects
Details
- Language :
- English
- ISSN :
- 09258388
- Volume :
- 854
- Database :
- Academic Search Index
- Journal :
- Journal of Alloys & Compounds
- Publication Type :
- Academic Journal
- Accession number :
- 147201555
- Full Text :
- https://doi.org/10.1016/j.jallcom.2020.156992