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Title: Spray-drying as a tool to disperse conductive carbon inside Na2FePO4F particles by addition of carbon black or carbon nanotubes to the precursor solution

Journal Article · · Journal of Solid State Electrochemistry
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  1. Univ. of Liege, (Belgium). GREENMat, CESAM Research Unit, Inst. of Chemistry B6
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division
  3. Univ. of Liege, (Belgium). Lab. of Inorganic Analytical Chemistry, Dept. of Chemistry

In this work, Na2FePO4F-carbon composite powders were prepared by spray-drying a solution of inorganic precursors with 10 and 20 wt% added carbon black (CB) or carbon nanotubes (CNTs). In order to compare the effect of CB and CNT when added to the precursor solutions, the structural, electrochemical, and morphological properties of the synthesized Na2FePO4F-xCB and Na2FePO4F-xCNT samples were systematically investigated. In both cases, X-ray diffraction shows that calcination at 600 °C in argon leads to the formation of Na2FePO4F as the major inorganic phase. 57Fe Mössbauer spectroscopy was used as complementary technique to probe the oxidation states, local environment, and identify the composition of the iron-containing phases. The electrochemical performance is markedly better in the case of Na2FePO4F-CNT (20 wt%), with specific capacities of about 100 mAh/g (Na2FePO4F-CNT) at C/4 rate vs. 50 mAh/g for Na2FePO4F-CB (20 wt%). SEM characterization of Na2FePO4F-CB particles revealed different particle morphologies for the Na2FePO4F-CNT and Na2FePO4F-CB powders. The carbon-poor surface observed for Na2FePO4F-CB could be due to a slow diffusion of carbon in the droplets during drying. On the contrary, Na2FePO4F-CNT shows a better CNT dispersion inside and at the surface of the NFPF particles that improves the electrochemical performance.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE; Fonds pour la Formation à la Recherche dans l’Industrie et l’Agriculture (FRIA); Walloon Region
Grant/Contract Number:
AC05-00OR22725; 1.E056.11
OSTI ID:
1474846
Journal Information:
Journal of Solid State Electrochemistry, Vol. 22, Issue 1; ISSN 1432-8488
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 20 works
Citation information provided by
Web of Science

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An Overview of Mixed Polyanionic Cathode Materials for Sodium‐Ion Batteries journal September 2018
NiO/CNTs derived from metal-organic frameworks as superior anode material for lithium-ion batteries journal October 2017