Abstract
Na 2 Ti 3 O 7 has been known for a long time and studied for several applications in sensors, catalysis and in toxic waste removal. The applicability of Na 2 Ti 3 O 7 as an anode material for rechargeable Na-ion batteries was investigated in this study. Na 2 Ti 3 O 7 nano fibers were synthesized by hydrothermal technique and characterized by using X-ray diffraction and scanning electron microscopy. The results show that spherical Na 2 Ti 3 O 7 materials consisting of tiny nano fibers have been formed. The electrochemical characterization was performed with Na metal electrode in coin half-cells fabricated in an Ar inert atmosphere. The galvanostatic charge-discharge measurements in the voltage range of 0.02 - 1.9 V revealed the initial discharge capacity of 787.2 mAhg -1 at C / 10 rate and the discharge capacity was decreased to 55 mAhg -1 over 30 cycles. The results suggest that the crystalline Na 2 Ti 3 O 7 nano fibers are suitable to be used as an anode material in rechargeable Na-ion batteries.
Highlights
Li-ion batteries are the most dominant power sources used in portable electronic devices and in electric vehicles due to their high energy density and long cycle life
The XRD pattern (Cu Kα) of the as-prepared Na2Ti3O7 nano fiber is shown in Figure 2 and corresponding peaks are compared with the standard peak patterns of Na2Ti3O7 crystalline material (PDF No 00-059-0666)
The Na2Ti3O7 nanofibers were synthesized by low temperature hydrothermal technique at 150 oC and its electrochemical characterization was studied in order to determine its applicability as an anode material for Naion batteries
Summary
Li-ion batteries are the most dominant power sources used in portable electronic devices and in electric vehicles due to their high energy density and long cycle life. They are being developed for applications in the smart grid to store excess electrical energy for future consumption. For large scale applications of Li- ion batteries, the cost of the raw materials is one of the most important factors to be considered. If electrochemical performance of Liion batteries could be replaced by Na-ion batteries, the cost of rechargeable batteries could be dramatically reduced and large scale applications would be more feasible (Wang et al, 2013; Seung-Min et al, 2013)
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