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Calorimetric Study of Mixed Phosphates Na4M3(PO4)2P2O7 (M = Mn2+, Fe2+, Co2+, Ni2+) to Evaluate the Electrochemical Trends

Journal Article · · Journal of Physical Chemistry. C
 [1];  [2];  [3];  [4]
  1. Arizona State University, Tempe, AZ (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Chemical Sciences Division
  2. Indian Institute of Science, Bangalore (India). Faraday Materials Laboratory
  3. Indian Institute of Science, Bangalore (India). Faraday Materials Laboratory; Helmholtz Institute Ulm (Germany); Karlsruhe Institute of Technology (KIT) (Germany)
  4. Arizona State University, Tempe, AZ (United States)
Mixed polyanionic compounds have been studied extensively as viable cathode materials for sodium-ion batteries. Mixed phosphates, Na4M3(PO4)2P2O7 (M = Mn2+, Fe2+, Co2+, Ni2+), provide a low barrier for Na-ion diffusion, being advantageous in comparison to phosphates and pyrophosphates. The reported order of sodium extraction is ambiguous and remains unclear. Despite being structurally similar, electrochemical performance differs for all four analogues with different degrees of (de)sodiation, according to the transition element present. High-temperature oxide melt solution calorimetry has been used to establish the relation between thermodynamic phase stability and observed capacity for this series of mixed phosphates. Thermodynamic phase stability largely depends on the kind of structure, type of bonding, and size of the cations present. So, according to our results, the thermodynamic phase stability follows the order Na4Mn3(PO4)2P2O7 > Na4Fe3(PO4)2P2O7 > Na4Co3(PO4)2P2O7 > Na4Ni3(PO4)2P2O7. The thermodynamic studies serve as guidelines for the selection of compositions with the potential for fabricating advanced cathode materials with maximum performance.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Government of India; Alexander von Humboldt Foundation
Grant/Contract Number:
AC05-00OR22725; SC0021987
OSTI ID:
1987773
Journal Information:
Journal of Physical Chemistry. C, Journal Name: Journal of Physical Chemistry. C Journal Issue: 24 Vol. 127; ISSN 1932-7447
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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