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Preparation and structure of Na2Ag5Fe3(P2O7)4 -Ag metal composite: Insights on electrochemistry

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Abstract

Ag7Fe3(P2O7)4 is a 3D structured material which has been recently studied as a possible cathode material for lithium batteries. Notably, Na7Fe3(P2O7)4 is reported to be a fast-ion conductor, yet poor electrical conductor. Here, partial replacement of Na+ for Ag+ yielded Na2Ag5Fe3(P2O7)4 pyrophosphate framework where the formation of Ag metal is proposed to increase the intrinsic low electrical conductivity of this polyanion electrode. Specifically, the Ag5Na2Fe3(P2O7)4 -Ag composite is synthesized via chemical reduction of Ag7Fe3(P2O7)4 using NaBH4. The occupancy of Ag+ and Na+ in each site was determined via Rietveld analysis of the diffraction pattern. Electrochemistry of the Ag5Na2Fe3(P2O7)4 -Ag metal composite was explored with voltammetry and galvanostatic charge/discharge cycling. The Ag5Na2Fe3(P2O7)4 -Ag metal composite electrodes displayed good rate capability assisted by the presence of Ag metal from the chemical reduction and in-situ electrochemical formation of a Ag conductive network.

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Authors and Affiliations

  1. Department of Chemistry, Stony Brook University, 11794, NY, USA

    Yiman Zhang, Amy C. Marschilok, Esther S. Takeuchi & Kenneth J. Takeuchi

  2. Materials Science and Chemical Engineering, Stony Brook University, 11794, Stony Brook, NY, USA

    Amy C. Marschilok, Esther S. Takeuchi & Kenneth J. Takeuchi

  3. Energy Sciences Directorate, Brookhaven National Laboratory, 11973, Upton, NY, USA

    Esther S. Takeuchi

Authors
  1. Yiman Zhang
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  2. Amy C. Marschilok
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  3. Esther S. Takeuchi
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  4. Kenneth J. Takeuchi
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Correspondence to Amy C. Marschilok, Esther S. Takeuchi or Kenneth J. Takeuchi.

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Zhang, Y., Marschilok, A.C., Takeuchi, E.S. et al. Preparation and structure of Na2Ag5Fe3(P2O7)4 -Ag metal composite: Insights on electrochemistry. MRS Advances 2, 395–400 (2017). https://doi.org/10.1557/adv.2017.56

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