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Title: Alluaudite Na2Co2 Fe(PO4)3 as an electroactive material for sodium ion batteries

Journal Article · · Dalton Transactions
DOI: https://doi.org/10.1039/C5DT00971E · OSTI ID:1338506
 [1];  [1];  [1];  [1];  [1];  [2];  [3];  [4]; ORCiD logo [4];  [5]
  1. Qatar Foundation, Doha (Qatar). Qatar Environment and Energy Research Inst.
  2. Univ. del País Vasco, Bilbao (Spain). Dept. de Física de la Materia Condensada
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division
  4. Nankai Univ., Tianjin (China). Inst. of New Energy Material Chemistry
  5. Hanyang Univ., Seongdong-gu, Seoul (Korea). Dept. of Energy Engineering

The electroactive orthophosphate Na2Co2Fe(PO4)3 was synthesized using a solid state reaction. Its crystal structure was solved using the combination of powder X-ray-and neutron-diffraction data. This material crystallizes according to the alluaudite structure (S.G. C2/c). The structure consists of edge sharing [MO6] octahedra (M = Fe, Co) resulting in chains parallel to [-101]. These chains are linked together via the [PO4] tetrahedra to form two distinct tunnels in which sodium cations are located. The electrochemical properties of Na2Co2Fe(PO4)3 were evaluated by galvanostatic charge-discharge cycling. During the first discharge to 0.03 V, Na2Co2Fe(PO4)3 delivers a specific capacity of 604 mA h g(-1). This capacity is equivalent to the reaction of more than seven sodium ions per formula unit. Hence, this is a strong indication of a conversion-type reaction with the formation of metallic Fe and Co. The subsequent charge and discharge involved the reaction of fewer Na ions as expected for a conversion reaction. When discharged to 0.9 V, the material intercalated only one Na+-ion leading to the formation of a new phase Na3Co2Fe(PO4)3. This phase could then be cycled reversibly with an average voltage of 3.6 V vs. Na+/Na and a capacity of 110 mA h g(-1). This result is in good agreement with the theoretical capacity expected from the extraction/insertion of two sodium atoms in Na2Co2Fe(PO4)3.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1338506
Journal Information:
Dalton Transactions, Vol. 44, Issue 17; ISSN 1477-9226
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 47 works
Citation information provided by
Web of Science

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Cited By (9)

Challenges and Perspectives for NASICON-Type Electrode Materials for Advanced Sodium-Ion Batteries journal June 2017
Polyanionic Insertion Materials for Sodium-Ion Batteries journal April 2018
Synthesis, Structure, and Conductivity of Alluaudite-Related Phases in the Na 2 MoO 4 -Cs 2 MoO 4 -CoMoO 4 System : Synthesis, Structure, and Conductivity of Alluaudite-Related Phases in the Na journal December 2018
A new sodium ferrous orthophosphate Na x Fe4(PO4)3 as anode materials for sodium-ion batteries journal February 2018
Synthesis, Crystal Structure and Properties of a New Phosphate, Na2Co2Cr(PO4)3 journal September 2018
Synthesis, Characterization, and Magnetic Properties of A2Co2Fe(VO4)3 (A = Ag or Na) Alluaudite-Type Vanadates journal December 2018
New alluaudite-related triple molybdates Na 25 Cs 8 R 5 (MoO 4 ) 24 (R = Sc, In): synthesis, crystal structures and properties journal January 2017
Crystal structure of alluaudite-type NaMg 3 (HPO 4 ) 2 (PO 4 ) journal June 2015
Structural properties of the alluaudite-type materials Ag2–xNaxMn3(VO4)3 (x=0.62 and 1.85) journal September 2019

Figures / Tables (8)