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Title: Electrochemical studies of a high voltage Na 4 Co 3 (PO 4 ) 2 P 2 O 7 –MWCNT composite through a selected stable electrolyte

Abstract

Cathode materials that operate at high voltages are required to realize the commercialization of high-energy-density sodium-ion batteries. In this study, we prepared different composites of sodium cobalt mixed-phosphate with multiwalled carbon nanotubes (Na4Co3(PO4)2P2O7–MWCNTs) by the sol–gel synthesis technique. The crystal structure and microstructure were characterized by using PXRD, TGA, Raman spectroscopy, SEM and TEM. The electrochemical properties of the Na4Co3(PO4)2P2O7–20 wt% MWCNT composite were explored using two different electrolytes. The composite electrode exhibited excellent cyclability and rate capabilities with the electrolyte composed of 1 M sodium hexafluorophosphate in ethylene carbonate:dimethyl carbonate (EC:DMC). The composite electrode delivered stable discharge capacities of 80 mA h g-1 and 78 mA h g-1 at room and elevated (55 °C) temperatures, respectively. The average discharge voltage was around 4.45 V versus Na+/Na, which corresponded to the Co2+/3+ redox couple. The feasibility of the Na4Co3(PO4)2P2O7 cathode for sodium-ion batteries has been confirmed in real time using a full cell configuration vs. NaTi2(PO4)3–20 wt% MWCNT, and it delivers an initial discharge capacity of 78 mA h g-1 at 0.2C rate.

Authors:
ORCiD logo [1];  [2]; ORCiD logo [1];  [2];  [2]
+ Show Author Affiliations
  1. Qatar Environment and Energy Research Institute (QEERI), Hamad Bin Khalifa University, Qatar Foundation, Doha, Qatar
  2. Energy and Transportation Science Division, Oak Ridge National Laboratory, Oak Ridge, USA
Publication Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Electricity (OE)
OSTI Identifier:
1615694
Alternate Identifier(s):
OSTI ID: 1616811
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Published Article
Journal Name:
RSC Advances
Additional Journal Information:
Journal Name: RSC Advances Journal Volume: 10 Journal Issue: 27; Journal ID: ISSN 2046-2069
Publisher:
Royal Society of Chemistry
Country of Publication:
United Kingdom
Language:
English
Subject:
25 ENERGY STORAGE

Citation Formats

Kumar, P. Ramesh, Essehli, R., Yahia, H. B., Amin, R., and Belharouak, I. Electrochemical studies of a high voltage Na 4 Co 3 (PO 4 ) 2 P 2 O 7 –MWCNT composite through a selected stable electrolyte. United Kingdom: N. p., 2020. Web. doi:10.1039/D0RA02349C.
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Kumar, P. Ramesh, Essehli, R., Yahia, H. B., Amin, R., & Belharouak, I. Electrochemical studies of a high voltage Na 4 Co 3 (PO 4 ) 2 P 2 O 7 –MWCNT composite through a selected stable electrolyte. United Kingdom. https://doi.org/10.1039/D0RA02349C
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Kumar, P. Ramesh, Essehli, R., Yahia, H. B., Amin, R., and Belharouak, I. Wed . "Electrochemical studies of a high voltage Na 4 Co 3 (PO 4 ) 2 P 2 O 7 –MWCNT composite through a selected stable electrolyte". United Kingdom. https://doi.org/10.1039/D0RA02349C.
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@article{osti_1615694,
title = {Electrochemical studies of a high voltage Na 4 Co 3 (PO 4 ) 2 P 2 O 7 –MWCNT composite through a selected stable electrolyte},
author = {Kumar, P. Ramesh and Essehli, R. and Yahia, H. B. and Amin, R. and Belharouak, I.},
abstractNote = {Cathode materials that operate at high voltages are required to realize the commercialization of high-energy-density sodium-ion batteries. In this study, we prepared different composites of sodium cobalt mixed-phosphate with multiwalled carbon nanotubes (Na4Co3(PO4)2P2O7–MWCNTs) by the sol–gel synthesis technique. The crystal structure and microstructure were characterized by using PXRD, TGA, Raman spectroscopy, SEM and TEM. The electrochemical properties of the Na4Co3(PO4)2P2O7–20 wt% MWCNT composite were explored using two different electrolytes. The composite electrode exhibited excellent cyclability and rate capabilities with the electrolyte composed of 1 M sodium hexafluorophosphate in ethylene carbonate:dimethyl carbonate (EC:DMC). The composite electrode delivered stable discharge capacities of 80 mA h g-1 and 78 mA h g-1 at room and elevated (55 °C) temperatures, respectively. The average discharge voltage was around 4.45 V versus Na+/Na, which corresponded to the Co2+/3+ redox couple. The feasibility of the Na4Co3(PO4)2P2O7 cathode for sodium-ion batteries has been confirmed in real time using a full cell configuration vs. NaTi2(PO4)3–20 wt% MWCNT, and it delivers an initial discharge capacity of 78 mA h g-1 at 0.2C rate.},
doi = {10.1039/D0RA02349C},
journal = {RSC Advances},
number = 27,
volume = 10,
place = {United Kingdom},
year = {Wed Apr 22 00:00:00 EDT 2020},
month = {Wed Apr 22 00:00:00 EDT 2020}
}
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https://doi.org/10.1039/D0RA02349C
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