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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

Journal Article · · RSC Advances
DOI:https://doi.org/10.1039/D0RA02349C· OSTI ID:1615694
ORCiD logo [1];  [2]; ORCiD logo [1];  [2];  [2]
  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

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.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Electricity (OE)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1615694
Alternate ID(s):
OSTI ID: 1616811
Journal Information:
RSC Advances, Journal Name: RSC Advances Vol. 10 Journal Issue: 27; ISSN 2046-2069
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United Kingdom
Language:
English
Citation Metrics:
Cited by: 9 works
Citation information provided by
Web of Science

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