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Electrochemical investigations of high-voltage Na4Ni3(PO4)2P2O7 cathode for sodium-ion batteries

Journal Article · · Journal of Solid State Electrochemistry
 [1];  [1];  [2];  [3];  [4];  [2];  [2]
  1. Hamad Bin Khalifa Univ., Qatar Foundation, Doha (Qatar). Qatar Environment and Energy Research Inst. (QEERI)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Institute Charles Gerhardt, Montpellier (France)
  4. Karlsruhe Inst. of Technology (KIT) (Germany)
In this work, the electrochemical properties of carbon and reduced graphene-coated Na4Ni3(PO4)2P2O7 materials have been evaluated as high-voltage positive electrodes for sodium-ion batteries. Na4Ni3(PO4)2P2O7 exhibits the highest Ni3+/Ni2+ redox potential of 4.8 V vs. Na+/Na with a theoretical capacity of 127 mAh g-1. Here, we report on the synthesis and characterizations of Na4Ni3(PO4)2P2O7-reduced graphene oxide and Na4Ni3(PO4)2P2O7-carbon composites. The high-voltage dimethyl carbonate–based electrolyte has been chosen to explore the electrochemical properties of Na4Ni3(PO4)2P2O7 as a cathode. Carbon-coated Na4Ni3(PO4)2P2O7 composite electrode delivers a stable discharge capacity of 51 mAh g-1 at 0.1 C rate for 40 cycles which corresponds to a reversible intercalation/de-intercalation of 1.3 sodium ions. The structural deformation has been observed during the charge–discharge process beyond the removal of 1.3 Na+ ions and has been confirmed by in situ PXRD measurements. The present results provide a guideline to improve the performances of the high-voltage Na4Ni3(PO4)2P2O7 material for the next generation sodium-ion batteries.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
Qatar National Research Fund (QNRF); USDOE
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1608198
Journal Information:
Journal of Solid State Electrochemistry, Journal Name: Journal of Solid State Electrochemistry Journal Issue: 1 Vol. 24; ISSN 1432-8488
Publisher:
Springer NatureCopyright Statement
Country of Publication:
United States
Language:
English

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