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

Yiman Zhang; Amy C. Marschilok; Esther S. Takeuchi; Kenneth J. Takeuchi

doi:10.1557/adv.2017.56

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

Stony Brook University

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

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.

Original language	English
Pages (from-to)	395-400
Number of pages	6
Journal	MRS Advances
Volume	2
Issue number	7
DOIs	https://doi.org/10.1557/adv.2017.56
State	Published - 2017

Keywords

Ag
crystallographic structure
energy storage

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10.1557/adv.2017.56

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@article{e6d17cd4d5534cd087ed6e74282bfe55,

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

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 = "Ag, crystallographic structure, energy storage",

author = "Yiman Zhang and Marschilok, \{Amy C.\} and Takeuchi, \{Esther S.\} and Takeuchi, \{Kenneth J.\}",

note = "Publisher Copyright: Copyright {\textcopyright} Materials Research Society 2017.",

year = "2017",

doi = "10.1557/adv.2017.56",

language = "English",

volume = "2",

pages = "395--400",

journal = "MRS Advances",

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TY - JOUR

T1 - Preparation and structure of Na2Ag5Fe3(P2O7)4 -Ag metal composite

T2 - Insights on electrochemistry

AU - Zhang, Yiman

AU - Marschilok, Amy C.

AU - Takeuchi, Esther S.

AU - Takeuchi, Kenneth J.

PY - 2017

Y1 - 2017

N2 - 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.

AB - 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.

KW - Ag

KW - crystallographic structure

KW - energy storage

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DO - 10.1557/adv.2017.56

M3 - Article

AN - SCOPUS:85041588161

SN - 2059-8521

VL - 2

SP - 395

EP - 400

JO - MRS Advances

JF - MRS Advances

IS - 7

ER -

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

Abstract

Keywords

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