High-energy density room temperature sodium-sulfur battery enabled by sodium polysulfide catholyte and carbon cloth current collector decorated with MnO 2 nanoarrays

Ajit Kumar, Arnab Ghosh, Amlan Roy, Manas Ranjan Panda, Maria Forsyth, Douglas R. MacFarlane, Sagar Mitra

Research output: Contribution to journalArticleResearchpeer-review

2 Citations (Scopus)

Abstract

The sodium-sulfur (Na-S) battery is a well-known large-scale electrochemical storage option. The disadvantages of this particular battery technology result from its high operation temperature. Room temperature sodium-sulfur (RT Na-S) batteries would overcome these issues, but have issues of their own, such as rapid capacity decay caused by the “polysulfide shuttle” and low usage of active material resulting from the insulating nature of sulfur and the final discharge product. Here, we prepare a free-standing cathode using manganese dioxide decorated carbon cloth (CC@MnO 2 ) as an electronically-conducting substrate and polysulfide reservoir, and sodium polysulfide (Na 2 S 6 ) catholyte as the active material. Without incorporating any active interlayer, nor an expensive ion-selective membrane (such as Nafion), this free-standing cathode exhibits an initial reversible specific capacity of 938 mA h g –1 with remarkable capacity retention of 67% after 500 cycles. The as-assembled RT Na-S cell operates at an average potential of 1.82 V and delivered an initial energy density (based on the mass and molecular weight of sulfur and sodium) of 946 W h kg –1 , retained an energy density of 855 W h kg –1 after 50 cycles, and attend energy density of 728 W h kg –1 after 500 cycles. Furthermore, the nature of the interactions between MnO 2 and the intermediate polysulfides is investigated by X-ray photoelectron spectroscopy.

Original languageEnglish
Pages (from-to)196-202
Number of pages7
JournalEnergy Storage Materials
Volume20
DOIs
Publication statusPublished - Jul 2019

Keywords

  • Catholyte
  • Flexible electrode
  • Metal oxide
  • Polythionate
  • Sodium-sulfur batteries

Cite this

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title = "High-energy density room temperature sodium-sulfur battery enabled by sodium polysulfide catholyte and carbon cloth current collector decorated with MnO 2 nanoarrays",
abstract = "The sodium-sulfur (Na-S) battery is a well-known large-scale electrochemical storage option. The disadvantages of this particular battery technology result from its high operation temperature. Room temperature sodium-sulfur (RT Na-S) batteries would overcome these issues, but have issues of their own, such as rapid capacity decay caused by the “polysulfide shuttle” and low usage of active material resulting from the insulating nature of sulfur and the final discharge product. Here, we prepare a free-standing cathode using manganese dioxide decorated carbon cloth (CC@MnO 2 ) as an electronically-conducting substrate and polysulfide reservoir, and sodium polysulfide (Na 2 S 6 ) catholyte as the active material. Without incorporating any active interlayer, nor an expensive ion-selective membrane (such as Nafion), this free-standing cathode exhibits an initial reversible specific capacity of 938 mA h g –1 with remarkable capacity retention of 67{\%} after 500 cycles. The as-assembled RT Na-S cell operates at an average potential of 1.82 V and delivered an initial energy density (based on the mass and molecular weight of sulfur and sodium) of 946 W h kg –1 , retained an energy density of 855 W h kg –1 after 50 cycles, and attend energy density of 728 W h kg –1 after 500 cycles. Furthermore, the nature of the interactions between MnO 2 and the intermediate polysulfides is investigated by X-ray photoelectron spectroscopy.",
keywords = "Catholyte, Flexible electrode, Metal oxide, Polythionate, Sodium-sulfur batteries",
author = "Ajit Kumar and Arnab Ghosh and Amlan Roy and Panda, {Manas Ranjan} and Maria Forsyth and MacFarlane, {Douglas R.} and Sagar Mitra",
year = "2019",
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language = "English",
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High-energy density room temperature sodium-sulfur battery enabled by sodium polysulfide catholyte and carbon cloth current collector decorated with MnO 2 nanoarrays. / Kumar, Ajit; Ghosh, Arnab; Roy, Amlan; Panda, Manas Ranjan; Forsyth, Maria; MacFarlane, Douglas R.; Mitra, Sagar.

In: Energy Storage Materials, Vol. 20, 07.2019, p. 196-202.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - High-energy density room temperature sodium-sulfur battery enabled by sodium polysulfide catholyte and carbon cloth current collector decorated with MnO 2 nanoarrays

AU - Kumar, Ajit

AU - Ghosh, Arnab

AU - Roy, Amlan

AU - Panda, Manas Ranjan

AU - Forsyth, Maria

AU - MacFarlane, Douglas R.

AU - Mitra, Sagar

PY - 2019/7

Y1 - 2019/7

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AB - The sodium-sulfur (Na-S) battery is a well-known large-scale electrochemical storage option. The disadvantages of this particular battery technology result from its high operation temperature. Room temperature sodium-sulfur (RT Na-S) batteries would overcome these issues, but have issues of their own, such as rapid capacity decay caused by the “polysulfide shuttle” and low usage of active material resulting from the insulating nature of sulfur and the final discharge product. Here, we prepare a free-standing cathode using manganese dioxide decorated carbon cloth (CC@MnO 2 ) as an electronically-conducting substrate and polysulfide reservoir, and sodium polysulfide (Na 2 S 6 ) catholyte as the active material. Without incorporating any active interlayer, nor an expensive ion-selective membrane (such as Nafion), this free-standing cathode exhibits an initial reversible specific capacity of 938 mA h g –1 with remarkable capacity retention of 67% after 500 cycles. The as-assembled RT Na-S cell operates at an average potential of 1.82 V and delivered an initial energy density (based on the mass and molecular weight of sulfur and sodium) of 946 W h kg –1 , retained an energy density of 855 W h kg –1 after 50 cycles, and attend energy density of 728 W h kg –1 after 500 cycles. Furthermore, the nature of the interactions between MnO 2 and the intermediate polysulfides is investigated by X-ray photoelectron spectroscopy.

KW - Catholyte

KW - Flexible electrode

KW - Metal oxide

KW - Polythionate

KW - Sodium-sulfur batteries

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JO - Energy Storage Materials

JF - Energy Storage Materials

SN - 2405-8297

ER -