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

Published online by Cambridge University Press:  16 January 2017

Yiman Zhang ,
Amy C. Marschilok ,
Esther S. Takeuchi  and
Kenneth J. Takeuchi
Yiman Zhang
Affiliation:
Department of Chemistry, Stony Brook University, NY 11794, USA
Amy C. Marschilok*
Affiliation:
Department of Chemistry, Stony Brook University, NY 11794, USA Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, NY 11794
Esther S. Takeuchi*
Affiliation:
Department of Chemistry, Stony Brook University, NY 11794, USA Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, NY 11794 Energy Sciences Directorate, Brookhaven National Laboratory, Upton, NY 11973
Kenneth J. Takeuchi*
Affiliation:
Department of Chemistry, Stony Brook University, NY 11794, USA Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, NY 11794
*
*Corresponding authors: (ACM) amy.marschilok@stonybrook.edu, (EST) esther.takeuchi@stonybrook.edu, (KJT) kenneth.takeuchi.1@stonybrook.edu
*Corresponding authors: (ACM) amy.marschilok@stonybrook.edu, (EST) esther.takeuchi@stonybrook.edu, (KJT) kenneth.takeuchi.1@stonybrook.edu
*Corresponding authors: (ACM) amy.marschilok@stonybrook.edu, (EST) esther.takeuchi@stonybrook.edu, (KJT) kenneth.takeuchi.1@stonybrook.edu
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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.

Keywords

Agcrystallographic structureenergy storage
Type
Articles
Information
MRS Advances , Volume 2 , Issue 7: Electrochemistry , 2017 , pp. 395 - 400
Copyright
Copyright © Materials Research Society 2017 

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