Electrochemical studies on Na2FeP2O7 pyrophosphate enhanced with SWCNT as intercalation compounds for Na-ion batteries: An insight into sensitive mode operations

•One pot sol-gel method is utilized to synthesize Na2FeP2O7 materials.•The electrochemical properties of the as-synthesized material are tuned by two different carbons.•Na2FeP2O7 pyrophosphate material with SWCNT’s showed enhanced capacity and better reversibility even at higher current rates.•In th...

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Bibliographic Details
Published in:Materials letters 2021-02, Vol.284, p.128949, Article 128949
Main Authors: Priyadarshini, Marimuthu, Preeti, Kushwaha, Kirubakaran, Kiran Preethi, Kumaresan, Lakshmanan, Vediappan, Kumaran
Format: Article
Language:English
Subjects:
Carbon
Carbon black
Carbon nanotubes
Charge transfer
Diffusion
Diffusion rate
Discharge
Elevated temperature
Intercalation compounds
Materials science
Multi wall carbon nanotubes
Polyanionic
Reaction kinetics
Rechargeable batteries
Single wall carbon nanotubes
Sodium
Sodium-ion batteries
Sol-gel processes
Specific capacity
Synthesis
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Summary:•One pot sol-gel method is utilized to synthesize Na2FeP2O7 materials.•The electrochemical properties of the as-synthesized material are tuned by two different carbons.•Na2FeP2O7 pyrophosphate material with SWCNT’s showed enhanced capacity and better reversibility even at higher current rates.•In this pyrophosphate material under extreme mode operations with SWCNT’s showed better electrochemical cycling. A sol-gel assisted method followed by post calcination is utilized here to synthesize polyanionic type Na2FeP2O7 (NVP) material as a cathode for Na-ion batteries. The NVP with super carbon black (SCB) as a conducting agent delivers a specific discharge capacity of 68 mAh g−1 at 0.1C in the initial cycle. To improve the specific capacity, stability and reversibility the different carbon sources such as Single-Walled Carbon Nanotube (SWCNT) and Multiwalled Carbon Nanotube (MWCNT) are physically mixed with the as-synthesized NVP material. The SWCNT mixed material shows a better specific discharge capacity of 73 mAh g−1 at the initial cycle at 0.1C rate. The structure modification with the SWCNT addition fastens the reaction kinetics, diffusion and the movement of the Na-ions, which leads to better capacity and rate performance.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2020.128949