X-ray Absorption Spectroscopic Characterization of the Synthesis Process: Revealing the Interactions in Cetyltrimethylammonium Bromide-Modified Sulfur–Graphene Oxide Nanocomposites

Ye, Yifan; Kawase, Ayako; Song, Min‐Kyu; Feng, Bo; Liu, Yi‐Sheng; Marcus, Matthew A.; Feng, Jun; Fang, Hai‐Tao; Cairns, Elton J.; Zhu, Junfa; Guo, Jinghua

doi:10.1021/acs.jpcc.6b00751

Cited by 13 publications

(18 citation statements)

References 32 publications

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“…This double plateau behavior of both PVS-and carrageenan-based electrodes shows the formation of S8 2-, and other longer chain (n > 8) sulfur species in every cycle even though the sulfur is bonded with polymer backbones. The sulfur electrode behavior is distinctively different from pre-synthesized carbon sulfur composite materials [12,21,57] . Fig.…”

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confidence: 82%

Nucleophilic substitution between polysulfides and binders unexpectedly stabilizing lithium sulfur battery

et al. 2017

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Polysulfide shuttling has been the primary cause of failure in lithium-sulfur (Li-S) battery cycling. Here, we demonstrate an uncleophilic substitution reaction between polysulfides and binder functional groups can unexpectedly immobilizes the polysulfides. The substitution reaction is verified by UV-visible spectra and X-ray photoelectron spectra. The immobilization of polysulfide is in situ monitored by synchrotron based sulfur K-edge X-ray absorption spectra. The resulting electrodes exhibite initial capacity up to 20.4 mAh/cm 2 , corresponding to 1199.1 mAh/g based on a micron-sulfur mass loading of 17.0 mg/cm 2 . The micron size sulfur transformed into nano layer coating on the cathode binder during cycling.Directly usage of nano-size sulfur promotes higher capacity of 33.7 mAh/cm 2 , which is the highest areal capacity reported in Li-S battery. This enhance performance is due to the reduced shuttle effect by covalently binding of the polysulfide with the polymer binder.2

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confidence: 82%

Nucleophilic substitution between polysulfides and binders unexpectedly stabilizing lithium sulfur battery

et al. 2017

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“…The synthesis of the CTAB-modified S-GO nano-compositions has been reported in our previous work. [1,28] Electrolytes containing 0.1 M, 0.5 M, and 1.0 M LiNO 3 have been investigated in each set of experiments. Galvanostatic discharge and charge cycling between 1.5 V and 2.8 V was performed using a battery cycler (Maccor Series 4000).…”

Section: Materials and Methods: 21 Cell Assembly And Testingmentioning

confidence: 99%

“…Benefiting from the element-resolved and chemical environmental-sensitive properties of XAS, various sulfur electrode constituents can be investigated individually. [27][28][29][30][31] Combining the spectroscopic investigations and electrochemical characterizations on Li-S cells with electrolyte containing various concentrations of LiNO 3 during longterm cycling we are able to provide new insights on how the LiNO 3 in the electrolyte can alter the properties of the CEI layer and thus influence the cell performance.…”

Section: Introductionmentioning

confidence: 99%

Lithium nitrate: A double-edged sword in the rechargeable lithium-sulfur cell

Song

et al. 2019

Energy Storage Materials

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Lithium nitrate (LiNO 3) has been the most studied electrolyte additive in lithium-sulfur (Li-S) cells, due to its known function of suppressing the shuttle effect in Li-S cells, which provides a significant increase in the cell's coulombic efficiency and cycling stability. Previous studies indicated that LiNO 3 participated in the formation of a passive layer on the lithium electrode and thus suppressed the redox shuttle of the dissolved polysulfides. However, the effects of the LiNO 3 on the positive electrode materials have rarely been investigated. By combining scanning electron microscopy (SEM), element-selective X-ray absorption spectroscopy, and electrochemical characterizations, we performed a comprehensive study of how the LiNO 3 altered the properties of the sulfur electrode/electrolyte interface in Li-S cells and thus influenced the cell performance. We found that LiNO 3 is a double-edged sword in the Li-S cell: on one hand, it increased the consumption of the active sulfur; on the other hand, it promoted the survival of the carbon matrix constituent in the sulfur electrode. These two competitive effects indicated that a proper moderate concentration of LiNO 3 is required to achieve an optimized cell performance.

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“…Finally, XAS was very recently used for detecting the interaction of sulfur precursors with appropriately modified graphene oxide nanocomposites, leading to the immobilization of the sulfur species in the electrode, improving the overall cycling performance of the cell [86].…”

Section: 3studyofli-sulfurbatteriesbysk-edgexasmentioning

confidence: 99%

X-Ray Absorption Spectroscopy Study of Battery Materials

Giorgetti¹,

Stievano²

2017

X-Ray Characterization of Nanostructured Energy Materials by Synchrotron Radiation

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X-ray absorption spectroscopy (XAS) as a local structural tool for the study of the electrochemical processes in battery materials is highlighted. Due to its elemental specificity and high penetration of the X-rays in the 4-35 keV range, XAS is particularly suited for this, allowing the study of battery materials using specifically developed in situ electrochemical cells. This energy is required to dislodge one core electron from transition metal or p-group atoms, which are commonly used as redox centers in positive and negative electrode materials. In such a simple picture, the ejected photoelectron is scattered by the surrounding atoms, producing characteristic traces in the X-ray absorption spectrum. Both positive and negative electrode materials (intercalation, alloy and conversion electrodes) can be studied. The chapter starts with an introduction of the context around battery studies, followed by a short explanation of the photoelectric effect at the basis of the X-ray absorption phenomenon and to specific features of XAS. A selection of XAS experiments conducted in the field of batteries will be then outlined, also emphasizing the effects due to nanoscale dimension of the material studied. Finally, a perspectives section will summarize the specific role that this spectroscopy has played in the battery community.

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X-ray Absorption Spectroscopic Characterization of the Synthesis Process: Revealing the Interactions in Cetyltrimethylammonium Bromide-Modified Sulfur–Graphene Oxide Nanocomposites

Cited by 13 publications

References 32 publications

Nucleophilic substitution between polysulfides and binders unexpectedly stabilizing lithium sulfur battery

Nucleophilic substitution between polysulfides and binders unexpectedly stabilizing lithium sulfur battery

Lithium nitrate: A double-edged sword in the rechargeable lithium-sulfur cell

X-Ray Absorption Spectroscopy Study of Battery Materials

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