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Understanding the effect of structural compositions on electrochemical properties of titanium-based polyanionic compounds for superior sodium storage.
- Source :
-
Solid State Ionics . Feb2020, Vol. 345, pN.PAG-N.PAG. 1p. - Publication Year :
- 2020
-
Abstract
- Titanium-based polyanionic compounds have gained wide attentions as anode materials for room-temperature sodium-ion batteries due to the robust structural framework, reversible redox chemistry, and compositional diversities. However, the effect of chemically-inserted cations on their structural and electrochemical properties is lack of being investigated to date. In this work, structural and electrochemical properties of ATi 2 (PO 4) 3 /C (A = Li, Na, Mg) compounds are comparatively studied by coupling X-ray diffraction, scanning electron microscope, cyclic voltammetry and galvanostatic measurements. Experimental results reveal that the structural composition is an important factor determining electrochemical properties of titanium-based polyanionic compounds, and the Li-containing composition shows the best charge/discharge performance with high specific capacities of 120.4 mAh g−1 at 20 mA g−1 and 89.7 mAh g−1 at 1000 mA g−1, and outstanding cycling stability without capacity fading after 1000 cycles. In particular, full battery assembled with it and Na 3 V 2 (PO 4) 3 cathode can deliver a specific energy of 124.5 Wh kg−1 at the power of 114.9 W kg−1, and a capacity retention of 84.9% after 100 cycles. • A x Ti 2 (PO 4) 3 /C (A = Li, Na, Mg) compositions are comparatively investigated. • LiTi 2 (PO 4) 3 composition shows the best sodium-storage performance. • Full battery with LiTi 2 (PO 4) 3 /C anode and Na 3 V 2 (PO 4) 3 /C cathode is studied. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 01672738
- Volume :
- 345
- Database :
- Academic Search Index
- Journal :
- Solid State Ionics
- Publication Type :
- Academic Journal
- Accession number :
- 141400084
- Full Text :
- https://doi.org/10.1016/j.ssi.2019.115194