Chemical Synthesis of K                         2                         S                         2                          and K                         2                         S                         3                          for Probing Electrochemical Mechanisms in K-S Batteries

Sichen Gu; Neng Xiao; Feng Wu; Ying Bai; Chuan Wu; Yiying Wu

doi:10.1021/acsenergylett.8b01719

Chemical Synthesis of K ₂ S ₂ and K ₂ S ₃ for Probing Electrochemical Mechanisms in K-S Batteries

Sichen Gu
, Neng Xiao
, Feng Wu
, Ying Bai^*
, Chuan Wu
, Yiying Wu

^*Corresponding author for this work

School of Material Science and Engineering

Beijing Institute of Technology
Ohio State University

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

87 Citations (Scopus)

Abstract

Understanding the properties of polysulfide intermediates is crucial for explaining and optimizing metal-sulfur batteries. Unlike the unstable or inseparable low-order polysulfide intermediates in Li-S systems, the K-S phase diagram displays a series of stable phases of K ₂ S _n (n = 1, 2, 3, 4, 5, 6), which provides the accessibility of an individual polysulfide to investigate the mechanism using pure-phase polysulfides. Herein, we synthesized two key intermediate polysulfides, K ₂ S ₂ and K ₂ S ₃ , and probed their electrochemical pathways. When K ₂ S ₂ and K ₂ S ₃ are coated directly on a current collector, both species can be further reduced. However, when K ₂ S ₂ and K ₂ S ₃ are electrically isolated from the current collector, no further reduction is observed, showing the reduction occurs through a solid-state conversion pathway. Interestingly, K ₂ S ₂ and K ₂ S ₃ can be charged even when they are electrically isolated from the current collector, proving solution-mediated charging pathways. Only K ₂ S is the "dead" sulfur species that cannot be charged.

Original language	English
Pages (from-to)	2858-2864
Number of pages	7
Journal	ACS Energy Letters
Volume	3
Issue number	12
DOIs	https://doi.org/10.1021/acsenergylett.8b01719
Publication status	Published - 14 Dec 2018

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Gu, S., Xiao, N., Wu, F., Bai, Y., Wu, C., & Wu, Y. (2018). Chemical Synthesis of K ₂ S ₂ and K ₂ S ₃ for Probing Electrochemical Mechanisms in K-S Batteries ACS Energy Letters, 3(12), 2858-2864. https://doi.org/10.1021/acsenergylett.8b01719

Gu, Sichen ; Xiao, Neng ; Wu, Feng et al. / Chemical Synthesis of K ₂ S ₂ and K ₂ S ₃ for Probing Electrochemical Mechanisms in K-S Batteries In: ACS Energy Letters. 2018 ; Vol. 3, No. 12. pp. 2858-2864.

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title = " Chemical Synthesis of K 2 S 2 and K 2 S 3 for Probing Electrochemical Mechanisms in K-S Batteries ",

abstract = " Understanding the properties of polysulfide intermediates is crucial for explaining and optimizing metal-sulfur batteries. Unlike the unstable or inseparable low-order polysulfide intermediates in Li-S systems, the K-S phase diagram displays a series of stable phases of K 2 S n (n = 1, 2, 3, 4, 5, 6), which provides the accessibility of an individual polysulfide to investigate the mechanism using pure-phase polysulfides. Herein, we synthesized two key intermediate polysulfides, K 2 S 2 and K 2 S 3 , and probed their electrochemical pathways. When K 2 S 2 and K 2 S 3 are coated directly on a current collector, both species can be further reduced. However, when K 2 S 2 and K 2 S 3 are electrically isolated from the current collector, no further reduction is observed, showing the reduction occurs through a solid-state conversion pathway. Interestingly, K 2 S 2 and K 2 S 3 can be charged even when they are electrically isolated from the current collector, proving solution-mediated charging pathways. Only K 2 S is the {"}dead{"} sulfur species that cannot be charged.",

author = "Sichen Gu and Neng Xiao and Feng Wu and Ying Bai and Chuan Wu and Yiying Wu",

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Gu, S, Xiao, N, Wu, F, Bai, Y , Wu, C & Wu, Y 2018, ' Chemical Synthesis of K ₂ S ₂ and K ₂ S ₃ for Probing Electrochemical Mechanisms in K-S Batteries ', ACS Energy Letters, vol. 3, no. 12, pp. 2858-2864. https://doi.org/10.1021/acsenergylett.8b01719

Chemical Synthesis of K ₂ S ₂ and K ₂ S ₃ for Probing Electrochemical Mechanisms in K-S Batteries . / Gu, Sichen; Xiao, Neng; Wu, Feng et al.
In: ACS Energy Letters, Vol. 3, No. 12, 14.12.2018, p. 2858-2864.

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

TY - JOUR

T1 - Chemical Synthesis of K 2 S 2 and K 2 S 3 for Probing Electrochemical Mechanisms in K-S Batteries

AU - Gu, Sichen

AU - Xiao, Neng

AU - Wu, Feng

AU - Bai, Ying

AU - Wu, Chuan

AU - Wu, Yiying

PY - 2018/12/14

Y1 - 2018/12/14

N2 - Understanding the properties of polysulfide intermediates is crucial for explaining and optimizing metal-sulfur batteries. Unlike the unstable or inseparable low-order polysulfide intermediates in Li-S systems, the K-S phase diagram displays a series of stable phases of K 2 S n (n = 1, 2, 3, 4, 5, 6), which provides the accessibility of an individual polysulfide to investigate the mechanism using pure-phase polysulfides. Herein, we synthesized two key intermediate polysulfides, K 2 S 2 and K 2 S 3 , and probed their electrochemical pathways. When K 2 S 2 and K 2 S 3 are coated directly on a current collector, both species can be further reduced. However, when K 2 S 2 and K 2 S 3 are electrically isolated from the current collector, no further reduction is observed, showing the reduction occurs through a solid-state conversion pathway. Interestingly, K 2 S 2 and K 2 S 3 can be charged even when they are electrically isolated from the current collector, proving solution-mediated charging pathways. Only K 2 S is the "dead" sulfur species that cannot be charged.

AB - Understanding the properties of polysulfide intermediates is crucial for explaining and optimizing metal-sulfur batteries. Unlike the unstable or inseparable low-order polysulfide intermediates in Li-S systems, the K-S phase diagram displays a series of stable phases of K 2 S n (n = 1, 2, 3, 4, 5, 6), which provides the accessibility of an individual polysulfide to investigate the mechanism using pure-phase polysulfides. Herein, we synthesized two key intermediate polysulfides, K 2 S 2 and K 2 S 3 , and probed their electrochemical pathways. When K 2 S 2 and K 2 S 3 are coated directly on a current collector, both species can be further reduced. However, when K 2 S 2 and K 2 S 3 are electrically isolated from the current collector, no further reduction is observed, showing the reduction occurs through a solid-state conversion pathway. Interestingly, K 2 S 2 and K 2 S 3 can be charged even when they are electrically isolated from the current collector, proving solution-mediated charging pathways. Only K 2 S is the "dead" sulfur species that cannot be charged.

UR - https://www.scopus.com/pages/publications/85058799695

U2 - 10.1021/acsenergylett.8b01719

DO - 10.1021/acsenergylett.8b01719

M3 - Article

AN - SCOPUS:85058799695

SN - 2380-8195

VL - 3

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JO - ACS Energy Letters

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ER -

Gu S, Xiao N, Wu F, Bai Y , Wu C, Wu Y. Chemical Synthesis of K ₂ S ₂ and K ₂ S ₃ for Probing Electrochemical Mechanisms in K-S Batteries ACS Energy Letters. 2018 Dec 14;3(12):2858-2864. doi: 10.1021/acsenergylett.8b01719

Chemical Synthesis of K ₂ S ₂ and K ₂ S ₃ for Probing Electrochemical Mechanisms in K-S Batteries

Abstract

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