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Hyo-jun Ahn - One of the best experts on this subject based on the ideXlab platform.

  • a singular flexible cathode for room temperature Sodium Sulfur Battery
    Journal of Power Sources, 2016
    Co-Authors: Icpyo Kim, Jou-hyeon Ahn, Ki-won Kim, Chang Hyeon Kim, Sunhwa Choi, Jaepyoung Ahn, Elton J Cairns, Hyo-jun Ahn
    Abstract:

    © 2015 Elsevier B.V. All rights reserved. This study introduces a new flexible cathode that contains no binder, conductive additive and current collector, but instead consists solely of a Sulfurized polyacrylonitrile nanofiber (SPAN) web which is prepared by a simple pyrolysis process with low cost raw materials. This not only exhibits good electrochemical properties, but also a high flexibility, rollability, and bendability to 180° without fracture. Its feasibility as a cathode for a low cost and flexible Na/S Battery is subsequently evaluated on the basis that S, PAN, and Na are cheap materials. The SPAN web delivers a high first discharge capacity of 604 mAh g-1 - electrode (1473 mAh g-1 - Sulfur) at 0.01 C based on Sulfur content. In cycle performance at 0.1 C, a first discharge capacity of 342 mAh g-1 - electrode is obtained and remains over 266 mAh g-1 - electrode after 200 cycles along with the coulombic efficiency near 100% from the second cycle. In terms of rate capability, it is shown to be capable of delivering a capacity of as high as 71 mAh g-1 at 1 C. The reversible electrochemical reaction of the SPAN web with Na is related to a reversible bond between the C-S and S-S bonds of the SPAN web.

  • discharge reaction mechanism of room temperature Sodium Sulfur Battery with tetra ethylene glycol dimethyl ether liquid electrolyte
    Journal of Power Sources, 2011
    Co-Authors: Ho Suk Ryu, Jou-hyeon Ahn, Ki-won Kim, Guoxiu Wang, T B Kim, Taehyun Nam, Hyo-jun Ahn
    Abstract:

    Abstract The first discharge curve of a Sodium–Sulfur cell using a tetra ethylene glycol dimethyl ether liquid electrolyte at room temperature shows two different regions: a sloping region and a plateau region of 1.66 V. The first discharge capacity is 538 mAh g −1 Sulfur and then decreases with repeated charge–discharge cycling to give 240 mAh g −1 after ten cycles. Elemental Sulfur of the cathode changes to Sodium polysulfides Na 2 S 2 and Na 2 S 3 , during full discharge. The Sodium polysulfides, however, do not reduce completely to elemental Sulfur after full charging. In summary, the mechanism of the Battery with liquid electrolyte is 2Na +  n S → Na 2 S n (4 >  n  ≥ 2) on discharge and Na 2 S n (4 >  n  ≥ 2) →  x (2Na +  n S) + (1 −  x )Na 2 S n (5 >  n  > 2) on charge.

  • discharge properties of all solid Sodium Sulfur Battery using poly ethylene oxide electrolyte
    Journal of Power Sources, 2007
    Co-Authors: Cheol-wan Park, Ho Suk Ryu, Jou-hyeon Ahn, Jaiyoung Lee, Ki-won Kim, Hyo-jun Ahn
    Abstract:

    Abstract An all-solid Sodium/Sulfur Battery using poly (ethylene oxide) (PEO) polymer electrolyte are prepared and tested at 90 °C. Each Battery is composed of a solid Sulfur electrode, a Sodium metal electrode, and a solid PEO polymer electrolyte. During the first discharge, the Battery shows plateau potentials at 2.27 and at 1.76 V. The first discharge capacity is 505 mAh g −1 Sulfur at 90 °C. The capacity drastically decreases by repeated on charge–discharge cycling but remains at 166 mAh g −1 Sulfur after 10 cycles. The latter value is higher than that reported for a Na/poly (vinylidene difluoride)/S Battery at room temperature.

  • Discharge properties of all-solid Sodium–Sulfur Battery using poly (ethylene oxide) electrolyte
    Journal of Power Sources, 2007
    Co-Authors: Cheol-wan Park, Ho Suk Ryu, Jou-hyeon Ahn, Jaiyoung Lee, Ki-won Kim, Hyo-jun Ahn
    Abstract:

    Abstract An all-solid Sodium/Sulfur Battery using poly (ethylene oxide) (PEO) polymer electrolyte are prepared and tested at 90 °C. Each Battery is composed of a solid Sulfur electrode, a Sodium metal electrode, and a solid PEO polymer electrolyte. During the first discharge, the Battery shows plateau potentials at 2.27 and at 1.76 V. The first discharge capacity is 505 mAh g −1 Sulfur at 90 °C. The capacity drastically decreases by repeated on charge–discharge cycling but remains at 166 mAh g −1 Sulfur after 10 cycles. The latter value is higher than that reported for a Na/poly (vinylidene difluoride)/S Battery at room temperature.

  • room temperature solid state Sodium Sulfur Battery
    Electrochemical and Solid State Letters, 2006
    Co-Authors: Cheol-wan Park, Ho Suk Ryu, Jou-hyeon Ahn, Ki-won Kim, Hyo-jun Ahn
    Abstract:

    Solid-state Sodium/Sulfur batteries using polyvinylidene-fluoride-hexafluoropropene (PVDF) polymer electrolyte were prepared and tested at room temperature. Solid Sodium/Sulfur batteries may be composed of solid-composite-type Sulfur electrodes, Sodium metal electrodes, and PVDF gel polymer electrolyte. The PVDF gel polymer electrolyte with tetraglyme plasticizer and NaCF 3 SO 3 salt had a high Sodium ion conductivity of 5.1 X 10 -4 S cm -1 at 25°C. During the first discharge, the Sodium/Sulfur Battery showed two plateau potentials of 2.27 and 1.73 V, respectively. The first discharge capacity was 489 mAh/g Sulfur at room temperature, which was similar to the high temperature Battery. The discharge capacity drastically decreased by repeated charge-discharge cycling, and remained at 40 mAh/g after 20 cycles.

Ki-won Kim - One of the best experts on this subject based on the ideXlab platform.

  • a singular flexible cathode for room temperature Sodium Sulfur Battery
    Journal of Power Sources, 2016
    Co-Authors: Icpyo Kim, Jou-hyeon Ahn, Ki-won Kim, Chang Hyeon Kim, Sunhwa Choi, Jaepyoung Ahn, Elton J Cairns, Hyo-jun Ahn
    Abstract:

    © 2015 Elsevier B.V. All rights reserved. This study introduces a new flexible cathode that contains no binder, conductive additive and current collector, but instead consists solely of a Sulfurized polyacrylonitrile nanofiber (SPAN) web which is prepared by a simple pyrolysis process with low cost raw materials. This not only exhibits good electrochemical properties, but also a high flexibility, rollability, and bendability to 180° without fracture. Its feasibility as a cathode for a low cost and flexible Na/S Battery is subsequently evaluated on the basis that S, PAN, and Na are cheap materials. The SPAN web delivers a high first discharge capacity of 604 mAh g-1 - electrode (1473 mAh g-1 - Sulfur) at 0.01 C based on Sulfur content. In cycle performance at 0.1 C, a first discharge capacity of 342 mAh g-1 - electrode is obtained and remains over 266 mAh g-1 - electrode after 200 cycles along with the coulombic efficiency near 100% from the second cycle. In terms of rate capability, it is shown to be capable of delivering a capacity of as high as 71 mAh g-1 at 1 C. The reversible electrochemical reaction of the SPAN web with Na is related to a reversible bond between the C-S and S-S bonds of the SPAN web.

  • discharge reaction mechanism of room temperature Sodium Sulfur Battery with tetra ethylene glycol dimethyl ether liquid electrolyte
    Journal of Power Sources, 2011
    Co-Authors: Ho Suk Ryu, Jou-hyeon Ahn, Ki-won Kim, Guoxiu Wang, T B Kim, Taehyun Nam, Hyo-jun Ahn
    Abstract:

    Abstract The first discharge curve of a Sodium–Sulfur cell using a tetra ethylene glycol dimethyl ether liquid electrolyte at room temperature shows two different regions: a sloping region and a plateau region of 1.66 V. The first discharge capacity is 538 mAh g −1 Sulfur and then decreases with repeated charge–discharge cycling to give 240 mAh g −1 after ten cycles. Elemental Sulfur of the cathode changes to Sodium polysulfides Na 2 S 2 and Na 2 S 3 , during full discharge. The Sodium polysulfides, however, do not reduce completely to elemental Sulfur after full charging. In summary, the mechanism of the Battery with liquid electrolyte is 2Na +  n S → Na 2 S n (4 >  n  ≥ 2) on discharge and Na 2 S n (4 >  n  ≥ 2) →  x (2Na +  n S) + (1 −  x )Na 2 S n (5 >  n  > 2) on charge.

  • discharge properties of all solid Sodium Sulfur Battery using poly ethylene oxide electrolyte
    Journal of Power Sources, 2007
    Co-Authors: Cheol-wan Park, Ho Suk Ryu, Jou-hyeon Ahn, Jaiyoung Lee, Ki-won Kim, Hyo-jun Ahn
    Abstract:

    Abstract An all-solid Sodium/Sulfur Battery using poly (ethylene oxide) (PEO) polymer electrolyte are prepared and tested at 90 °C. Each Battery is composed of a solid Sulfur electrode, a Sodium metal electrode, and a solid PEO polymer electrolyte. During the first discharge, the Battery shows plateau potentials at 2.27 and at 1.76 V. The first discharge capacity is 505 mAh g −1 Sulfur at 90 °C. The capacity drastically decreases by repeated on charge–discharge cycling but remains at 166 mAh g −1 Sulfur after 10 cycles. The latter value is higher than that reported for a Na/poly (vinylidene difluoride)/S Battery at room temperature.

  • Discharge properties of all-solid Sodium–Sulfur Battery using poly (ethylene oxide) electrolyte
    Journal of Power Sources, 2007
    Co-Authors: Cheol-wan Park, Ho Suk Ryu, Jou-hyeon Ahn, Jaiyoung Lee, Ki-won Kim, Hyo-jun Ahn
    Abstract:

    Abstract An all-solid Sodium/Sulfur Battery using poly (ethylene oxide) (PEO) polymer electrolyte are prepared and tested at 90 °C. Each Battery is composed of a solid Sulfur electrode, a Sodium metal electrode, and a solid PEO polymer electrolyte. During the first discharge, the Battery shows plateau potentials at 2.27 and at 1.76 V. The first discharge capacity is 505 mAh g −1 Sulfur at 90 °C. The capacity drastically decreases by repeated on charge–discharge cycling but remains at 166 mAh g −1 Sulfur after 10 cycles. The latter value is higher than that reported for a Na/poly (vinylidene difluoride)/S Battery at room temperature.

  • room temperature solid state Sodium Sulfur Battery
    Electrochemical and Solid State Letters, 2006
    Co-Authors: Cheol-wan Park, Ho Suk Ryu, Jou-hyeon Ahn, Ki-won Kim, Hyo-jun Ahn
    Abstract:

    Solid-state Sodium/Sulfur batteries using polyvinylidene-fluoride-hexafluoropropene (PVDF) polymer electrolyte were prepared and tested at room temperature. Solid Sodium/Sulfur batteries may be composed of solid-composite-type Sulfur electrodes, Sodium metal electrodes, and PVDF gel polymer electrolyte. The PVDF gel polymer electrolyte with tetraglyme plasticizer and NaCF 3 SO 3 salt had a high Sodium ion conductivity of 5.1 X 10 -4 S cm -1 at 25°C. During the first discharge, the Sodium/Sulfur Battery showed two plateau potentials of 2.27 and 1.73 V, respectively. The first discharge capacity was 489 mAh/g Sulfur at room temperature, which was similar to the high temperature Battery. The discharge capacity drastically decreased by repeated charge-discharge cycling, and remained at 40 mAh/g after 20 cycles.

Jou-hyeon Ahn - One of the best experts on this subject based on the ideXlab platform.

  • a singular flexible cathode for room temperature Sodium Sulfur Battery
    Journal of Power Sources, 2016
    Co-Authors: Icpyo Kim, Jou-hyeon Ahn, Ki-won Kim, Chang Hyeon Kim, Sunhwa Choi, Jaepyoung Ahn, Elton J Cairns, Hyo-jun Ahn
    Abstract:

    © 2015 Elsevier B.V. All rights reserved. This study introduces a new flexible cathode that contains no binder, conductive additive and current collector, but instead consists solely of a Sulfurized polyacrylonitrile nanofiber (SPAN) web which is prepared by a simple pyrolysis process with low cost raw materials. This not only exhibits good electrochemical properties, but also a high flexibility, rollability, and bendability to 180° without fracture. Its feasibility as a cathode for a low cost and flexible Na/S Battery is subsequently evaluated on the basis that S, PAN, and Na are cheap materials. The SPAN web delivers a high first discharge capacity of 604 mAh g-1 - electrode (1473 mAh g-1 - Sulfur) at 0.01 C based on Sulfur content. In cycle performance at 0.1 C, a first discharge capacity of 342 mAh g-1 - electrode is obtained and remains over 266 mAh g-1 - electrode after 200 cycles along with the coulombic efficiency near 100% from the second cycle. In terms of rate capability, it is shown to be capable of delivering a capacity of as high as 71 mAh g-1 at 1 C. The reversible electrochemical reaction of the SPAN web with Na is related to a reversible bond between the C-S and S-S bonds of the SPAN web.

  • discharge reaction mechanism of room temperature Sodium Sulfur Battery with tetra ethylene glycol dimethyl ether liquid electrolyte
    Journal of Power Sources, 2011
    Co-Authors: Ho Suk Ryu, Jou-hyeon Ahn, Ki-won Kim, Guoxiu Wang, T B Kim, Taehyun Nam, Hyo-jun Ahn
    Abstract:

    Abstract The first discharge curve of a Sodium–Sulfur cell using a tetra ethylene glycol dimethyl ether liquid electrolyte at room temperature shows two different regions: a sloping region and a plateau region of 1.66 V. The first discharge capacity is 538 mAh g −1 Sulfur and then decreases with repeated charge–discharge cycling to give 240 mAh g −1 after ten cycles. Elemental Sulfur of the cathode changes to Sodium polysulfides Na 2 S 2 and Na 2 S 3 , during full discharge. The Sodium polysulfides, however, do not reduce completely to elemental Sulfur after full charging. In summary, the mechanism of the Battery with liquid electrolyte is 2Na +  n S → Na 2 S n (4 >  n  ≥ 2) on discharge and Na 2 S n (4 >  n  ≥ 2) →  x (2Na +  n S) + (1 −  x )Na 2 S n (5 >  n  > 2) on charge.

  • discharge properties of all solid Sodium Sulfur Battery using poly ethylene oxide electrolyte
    Journal of Power Sources, 2007
    Co-Authors: Cheol-wan Park, Ho Suk Ryu, Jou-hyeon Ahn, Jaiyoung Lee, Ki-won Kim, Hyo-jun Ahn
    Abstract:

    Abstract An all-solid Sodium/Sulfur Battery using poly (ethylene oxide) (PEO) polymer electrolyte are prepared and tested at 90 °C. Each Battery is composed of a solid Sulfur electrode, a Sodium metal electrode, and a solid PEO polymer electrolyte. During the first discharge, the Battery shows plateau potentials at 2.27 and at 1.76 V. The first discharge capacity is 505 mAh g −1 Sulfur at 90 °C. The capacity drastically decreases by repeated on charge–discharge cycling but remains at 166 mAh g −1 Sulfur after 10 cycles. The latter value is higher than that reported for a Na/poly (vinylidene difluoride)/S Battery at room temperature.

  • Discharge properties of all-solid Sodium–Sulfur Battery using poly (ethylene oxide) electrolyte
    Journal of Power Sources, 2007
    Co-Authors: Cheol-wan Park, Ho Suk Ryu, Jou-hyeon Ahn, Jaiyoung Lee, Ki-won Kim, Hyo-jun Ahn
    Abstract:

    Abstract An all-solid Sodium/Sulfur Battery using poly (ethylene oxide) (PEO) polymer electrolyte are prepared and tested at 90 °C. Each Battery is composed of a solid Sulfur electrode, a Sodium metal electrode, and a solid PEO polymer electrolyte. During the first discharge, the Battery shows plateau potentials at 2.27 and at 1.76 V. The first discharge capacity is 505 mAh g −1 Sulfur at 90 °C. The capacity drastically decreases by repeated on charge–discharge cycling but remains at 166 mAh g −1 Sulfur after 10 cycles. The latter value is higher than that reported for a Na/poly (vinylidene difluoride)/S Battery at room temperature.

  • room temperature solid state Sodium Sulfur Battery
    Electrochemical and Solid State Letters, 2006
    Co-Authors: Cheol-wan Park, Ho Suk Ryu, Jou-hyeon Ahn, Ki-won Kim, Hyo-jun Ahn
    Abstract:

    Solid-state Sodium/Sulfur batteries using polyvinylidene-fluoride-hexafluoropropene (PVDF) polymer electrolyte were prepared and tested at room temperature. Solid Sodium/Sulfur batteries may be composed of solid-composite-type Sulfur electrodes, Sodium metal electrodes, and PVDF gel polymer electrolyte. The PVDF gel polymer electrolyte with tetraglyme plasticizer and NaCF 3 SO 3 salt had a high Sodium ion conductivity of 5.1 X 10 -4 S cm -1 at 25°C. During the first discharge, the Sodium/Sulfur Battery showed two plateau potentials of 2.27 and 1.73 V, respectively. The first discharge capacity was 489 mAh/g Sulfur at room temperature, which was similar to the high temperature Battery. The discharge capacity drastically decreased by repeated charge-discharge cycling, and remained at 40 mAh/g after 20 cycles.

Guoxiu Wang - One of the best experts on this subject based on the ideXlab platform.

  • the latest advances in the critical factors positive electrode electrolytes separators for Sodium Sulfur Battery
    Journal of Alloys and Compounds, 2019
    Co-Authors: Chengyin Wang, Guoxiu Wang
    Abstract:

    Abstract The Sodium-Sulfur (Na/S) batteries have caused widespread concern owing to the advantages of low cost and high energy density, these advantages make them promising in the large-scale energy storage system. But the research progress in this field is still at the beginning stage and confronts with tough challenges, for example, the low Sulfur conductivity and polysulfide shuttle effect. Considering Na/S Battery is a complicated system whose reaction mechanism between Sulfur and Sodium is different from the operating temperatures, positive electrode hosts and electrolytes, thus a comprehensive understanding about the electrochemistry of the Na/S batteries that operating in high-temperature, intermediate-temperature and room-temperature is necessary. In addition, the critical factors (positive electrodes, electrolytes, separators) associated with the development of high energy density and high performance Na/S Battery, it also need to be analysed for the successful application in the near future. In this review, the working methods of high-temperature Na/S (HT-Na/S) Battery, intermediate-temperature Na/S (IT-Na/S) Battery and room-temperature Na/S (RT-Na/S) Battery will be compared, and also focus on the latest progress of positive electrodes, electrolytes and separators in Na/S batteries. Finally, we provide an outlook on the state of the art for the production of more efficient and reliable Na/S batteries with rational technique.

  • a room temperature Sodium Sulfur Battery with high capacity and stable cycling performance
    Nature Communications, 2018
    Co-Authors: Dong Zhou, Xianying Qin, Kui Lin, Feiyu Kang, Devaraj Shanmukaraj, Teofilo Rojo, Michel Armand, Guoxiu Wang
    Abstract:

    High-temperature Sodium–Sulfur batteries operating at 300–350 °C have been commercially applied for large-scale energy storage and conversion. However, the safety concerns greatly inhibit their widespread adoption. Herein, we report a room-temperature Sodium–Sulfur Battery with high electrochemical performances and enhanced safety by employing a “cocktail optimized” electrolyte system, containing propylene carbonate and fluoroethylene carbonate as co-solvents, highly concentrated Sodium salt, and indium triiodide as an additive. As verified by first-principle calculation and experimental characterization, the fluoroethylene carbonate solvent and high salt concentration not only dramatically reduce the solubility of Sodium polysulfides, but also construct a robust solid-electrolyte interface on the Sodium anode upon cycling. Indium triiodide as redox mediator simultaneously increases the kinetic transformation of Sodium sulfide on the cathode and forms a passivating indium layer on the anode to prevent it from polysulfide corrosion. The as-developed Sodium–Sulfur batteries deliver high capacity and long cycling stability.

  • A room-temperature Sodium–Sulfur Battery with high capacity and stable cycling performance
    Nature communications, 2018
    Co-Authors: Dong Zhou, Xianying Qin, Kui Lin, Feiyu Kang, Devaraj Shanmukaraj, Teofilo Rojo, Michel Armand, Guoxiu Wang
    Abstract:

    High-temperature Sodium–Sulfur batteries operating at 300–350 °C have been commercially applied for large-scale energy storage and conversion. However, the safety concerns greatly inhibit their widespread adoption. Herein, we report a room-temperature Sodium–Sulfur Battery with high electrochemical performances and enhanced safety by employing a “cocktail optimized” electrolyte system, containing propylene carbonate and fluoroethylene carbonate as co-solvents, highly concentrated Sodium salt, and indium triiodide as an additive. As verified by first-principle calculation and experimental characterization, the fluoroethylene carbonate solvent and high salt concentration not only dramatically reduce the solubility of Sodium polysulfides, but also construct a robust solid-electrolyte interface on the Sodium anode upon cycling. Indium triiodide as redox mediator simultaneously increases the kinetic transformation of Sodium sulfide on the cathode and forms a passivating indium layer on the anode to prevent it from polysulfide corrosion. The as-developed Sodium–Sulfur batteries deliver high capacity and long cycling stability.

  • a stable quasi solid state Sodium Sulfur Battery
    Angewandte Chemie, 2018
    Co-Authors: Dong Zhou, Devaraj Shanmukaraj, Teofilo Rojo, Michel Armand, Yi Chen, Hongbo Fan, Faliang Cheng, Guoxiu Wang
    Abstract:

    Ambient-temperature Sodium-Sulfur (Na-S) batteries are considered a promising energy storage system due to their high theoretical energy density and low costs. However, great challenges remain in achieving a high rechargeable capacity and long cycle life. Herein we report a stable quasi-solid-state Na-S Battery enabled by a poly(S-pentaerythritol tetraacrylate (PETEA))-based cathode and a (PETEA-tris[2-(acryloyloxy)ethyl] isocyanurate (THEICTA))-based gel polymer electrolyte. The polymeric Sulfur electrode strongly anchors Sulfur through chemical binding and inhibits the shuttle effect. Meanwhile, the in situ formed polymer electrolyte with high ionic conductivity and enhanced safety successfully stabilizes the Na anode/electrolyte interface, and simultaneously immobilizes soluble Na polysulfides. The as-developed quasi-solid-state Na-S cells exhibit a high reversible capacity of 877 mA h g-1 at 0.1 C and an extended cycling stability.

  • discharge reaction mechanism of room temperature Sodium Sulfur Battery with tetra ethylene glycol dimethyl ether liquid electrolyte
    Journal of Power Sources, 2011
    Co-Authors: Ho Suk Ryu, Jou-hyeon Ahn, Ki-won Kim, Guoxiu Wang, T B Kim, Taehyun Nam, Hyo-jun Ahn
    Abstract:

    Abstract The first discharge curve of a Sodium–Sulfur cell using a tetra ethylene glycol dimethyl ether liquid electrolyte at room temperature shows two different regions: a sloping region and a plateau region of 1.66 V. The first discharge capacity is 538 mAh g −1 Sulfur and then decreases with repeated charge–discharge cycling to give 240 mAh g −1 after ten cycles. Elemental Sulfur of the cathode changes to Sodium polysulfides Na 2 S 2 and Na 2 S 3 , during full discharge. The Sodium polysulfides, however, do not reduce completely to elemental Sulfur after full charging. In summary, the mechanism of the Battery with liquid electrolyte is 2Na +  n S → Na 2 S n (4 >  n  ≥ 2) on discharge and Na 2 S n (4 >  n  ≥ 2) →  x (2Na +  n S) + (1 −  x )Na 2 S n (5 >  n  > 2) on charge.

Cheol-wan Park - One of the best experts on this subject based on the ideXlab platform.

  • discharge properties of all solid Sodium Sulfur Battery using poly ethylene oxide electrolyte
    Journal of Power Sources, 2007
    Co-Authors: Cheol-wan Park, Ho Suk Ryu, Jou-hyeon Ahn, Jaiyoung Lee, Ki-won Kim, Hyo-jun Ahn
    Abstract:

    Abstract An all-solid Sodium/Sulfur Battery using poly (ethylene oxide) (PEO) polymer electrolyte are prepared and tested at 90 °C. Each Battery is composed of a solid Sulfur electrode, a Sodium metal electrode, and a solid PEO polymer electrolyte. During the first discharge, the Battery shows plateau potentials at 2.27 and at 1.76 V. The first discharge capacity is 505 mAh g −1 Sulfur at 90 °C. The capacity drastically decreases by repeated on charge–discharge cycling but remains at 166 mAh g −1 Sulfur after 10 cycles. The latter value is higher than that reported for a Na/poly (vinylidene difluoride)/S Battery at room temperature.

  • Discharge properties of all-solid Sodium–Sulfur Battery using poly (ethylene oxide) electrolyte
    Journal of Power Sources, 2007
    Co-Authors: Cheol-wan Park, Ho Suk Ryu, Jou-hyeon Ahn, Jaiyoung Lee, Ki-won Kim, Hyo-jun Ahn
    Abstract:

    Abstract An all-solid Sodium/Sulfur Battery using poly (ethylene oxide) (PEO) polymer electrolyte are prepared and tested at 90 °C. Each Battery is composed of a solid Sulfur electrode, a Sodium metal electrode, and a solid PEO polymer electrolyte. During the first discharge, the Battery shows plateau potentials at 2.27 and at 1.76 V. The first discharge capacity is 505 mAh g −1 Sulfur at 90 °C. The capacity drastically decreases by repeated on charge–discharge cycling but remains at 166 mAh g −1 Sulfur after 10 cycles. The latter value is higher than that reported for a Na/poly (vinylidene difluoride)/S Battery at room temperature.

  • room temperature solid state Sodium Sulfur Battery
    Electrochemical and Solid State Letters, 2006
    Co-Authors: Cheol-wan Park, Ho Suk Ryu, Jou-hyeon Ahn, Ki-won Kim, Hyo-jun Ahn
    Abstract:

    Solid-state Sodium/Sulfur batteries using polyvinylidene-fluoride-hexafluoropropene (PVDF) polymer electrolyte were prepared and tested at room temperature. Solid Sodium/Sulfur batteries may be composed of solid-composite-type Sulfur electrodes, Sodium metal electrodes, and PVDF gel polymer electrolyte. The PVDF gel polymer electrolyte with tetraglyme plasticizer and NaCF 3 SO 3 salt had a high Sodium ion conductivity of 5.1 X 10 -4 S cm -1 at 25°C. During the first discharge, the Sodium/Sulfur Battery showed two plateau potentials of 2.27 and 1.73 V, respectively. The first discharge capacity was 489 mAh/g Sulfur at room temperature, which was similar to the high temperature Battery. The discharge capacity drastically decreased by repeated charge-discharge cycling, and remained at 40 mAh/g after 20 cycles.

  • Room-Temperature Solid-State Sodium∕Sulfur Battery
    Electrochemical and Solid-State Letters, 2006
    Co-Authors: Cheol-wan Park, Ho Suk Ryu, Jou-hyeon Ahn, Ki-won Kim, Hyo-jun Ahn
    Abstract:

    Solid-state Sodium/Sulfur batteries using polyvinylidene-fluoride-hexafluoropropene PVDF polymer electrolyte were prepared and tested at room temperature. Solid Sodium/Sulfur batteries may be composed of solid-composite-type Sulfur electrodes, Sodium metal electrodes, and PVDF gel polymer electrolyte. The PVDF gel polymer electrolyte with tetraglyme plasticizer and NaCF3SO3 salt had a high Sodium ion conductivity of 5.1 10−4 S cm−1 at 25°C. During the first discharge, the Sodium/Sulfur Battery showed two plateau potentials of 2.27 and 1.73 V, respectively. The first discharge capacity was 489 mAh/g Sulfur at room temperature, which was similar to the high temperature Battery. The discharge capacity drastically decreased by repeated chargedischarge cycling, and remained at 40 mAh/g after 20 cycles.