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Lecture

Synthesis and Electrochemical Properties of Na3V3P2O13 as Cathode Material for Sodium-Ion Batteries

Wednesday (28.09.2016)
11:30 - 11:45
Part of:


Sodium-ion batteries (SIBs) are evolving as low cost alternative to the state-of-the-art lithium-ion batteries (LIBs). Elementary properties of sodium, high abundance and low cost associated with sodium precursors made it a realistic alternative to lithium-ion chemistry [1,2]. Apparently the energy density of sodium-ion batteries is low compared to state-of-the-art LIBs. However, cost-effective, sustainable and safe battery systems could be achieved with SIBs (top most priorities for grid application). Research activities on SIBs are growing worldwide and still require a great deal of basic research. Synthesis and testing of new electrode materials is of great interest to realize the structural requirements to build sustainable and safe sodium-ion batteries.


Here, we present synthesis and electrochemical properties of new sodium vanadium oxy phosphate (NaVOP), Na3V3P2O13. The compound was synthesized by a two-step solid-state reaction. The structure of Na3V3P2O13 was identified by Rietveld refinement of the powder X-ray diffraction (XRD) pattern. The structure of parent compound Na2V3P2O13 (Figure) was used as the starting model. The half cells with Na2V3P2O13 as cathode and Na metal as anode shows a reversible capacity of 105 mAh/g at an average voltage of 2.7 V vs. Na+/Na when cycled in the voltage range of 4.5-2.0 V. High reversible capacity of 150 mAh/g could be obtained when cycled in the voltage rage of 4.5-1.5 V. Post structural analysis shows the compound is structurally stable over a broad range of sodium extraction and reinsertion demonstrating its potential as cathode material for sodium-ion batteries.


References:


1. M. D. Slater, D. Kim, E. Lee C. S. Johnson, Adv. Funct. Mater. 2013, 23, 947–958.

2. N. Yabuuchi, K. Kubota, M. Dahbi, S. Komaba, Chem. Rev. 2014, 114 (23), 11636–11682.






 

Speaker:
Dr. Anji Reddy Munnangi
Helmholtz Institute Ulm (HIU)
Additional Authors:
  • Dr. Oliver Clemens
    Darmstadt University of Technology
  • Prof. Dr. Maximilian Fichtner
    Helmholtz Institute Ulm (HIU)

Dateien

Category Short file description File description File Size
Präsentation Figure 1 Crystal structure of Na2V3P2O13 111 KB Download