Improve the electrodeposition of sulfur and lithium sulfide in lithium-sulfur batteries with a comb-like ion-conductive organo-polysulfide polymer binder

Zeng, Fanglei; Li, Ning; Shen, Yan-Qiu; Zhou, Xinyu; Jin, Zhaoqing; Yuan, Ningyi; Ding, Jianning; Wang, Anbang; Wang, Weikun; Yang, Yusheng

doi:10.1016/j.ensm.2018.09.018

Cited by 38 publications

(32 citation statements)

References 35 publications

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“…As shown in Fig. S1(a), this organo-polysulfide polymer (PSPEG) is comb-like, which consists of a plenty of organopolysulfide (-S x -) bonds in the main chain and low-molecular weight ethylene oxide groups (PEG) on the side chain as previous work reported [43] . And the -S x -bond in PSPEG polymer is reactive, which could chemically/electrochemically generate both inorganic unit (Li 2 S/Li 2 S 2 ) and organic unit (organo-sulfides/organopolysulfides, PEGS x 2 − , x ≥ 2) simultaneously once contacting fresh Li metal surface ( Fig.…”

Section: Introductionmentioning

confidence: 71%

“…However, the interfacial unstability of PVDF-based GPE with lithium anode influences its effective application in Li-S batteries. Recently, people found organo-polysulfide compounds/polymers can improve the SEI layer and stabilize the lithium anode [40][41][42][43] . Song [40] et al used alphalipoic acid (ALA) as an electrolyte additive in Li-S battery and found that the ALA could form a stable SEI layer on the cathode and anode surface, respectively, during the first discharge.…”

Section: Introductionmentioning

confidence: 99%

“…Wang's group [41 , 42] further developed a number of organo-sulfides as co-solvents or electrolyte additives, which could fabricate stable and flexible SEI layers to inhibit lithium dendrite growth. Furthermore, this organo-polysulfide compound/polymer also could serve as a kind of mediator for the undissolved Li 2 S/Li 2 S 2 and improve the deposition of Li 2 S/Li 2 S 2 on the electrode materials' surface [43] . In a word, the organopolysulfide compound/polymer is a good candidate for stabilizing the lithium anode.…”

Section: Introductionmentioning

confidence: 99%

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A novel permselective organo-polysulfides/PVDF gel polymer electrolyte enables stable lithium anode for lithium–sulfur batteries

Shen

Zeng

Zhou

et al. 2020

Journal of Energy Chemistry

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Lithium-sulfur (Li-S) battery can satisfy the need of the future power battery market because of its high energy density, but the hidden dangers caused by lithium anode have seriously hindered their commercialization. Herein, an innovative gel polymer electrolyte (GPE) composed of polyvinylidene fluoride (PVDF) and organo-polysulfide polymer (PSPEG) is proposed, which could be used in semisolid-state Li-S batteries for protection of Li anodes. Particularly, organo-polysulfide polymer could chemically/electrochemically generate both inorganic and organic components simultaneously in-situ once contacting fresh Li metal surface and/or during discharging processes. And these inorganic/organic components could participate in the formation of the SEI layer and finally constitute a stable and flexible hybrid SEI layer on the surface of Li metal anode. Moreover, the organic components were permselective to lithium ions against anions. Therefore, PVDF/PSPEG GPE ensures the ideal chemical and electrochemical properties for Li-S batteries. Our work demonstrates an effective solution to solve the problems about Li anodes and contributes to the development of the safe Li metal batteries.

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Section: Introductionmentioning

confidence: 71%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A novel permselective organo-polysulfides/PVDF gel polymer electrolyte enables stable lithium anode for lithium–sulfur batteries

Shen

Zeng

Zhou

et al. 2020

Journal of Energy Chemistry

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“…Furthermore, peaks at 161.2 and 162.5 eV demonstrate the existence of S 2− in Figure 5D, suggesting the formation of MoS 2 (Liu L. et al, 2013;Song et al, 2018). In addition, sulfur peak at 164.3 eV means some sulfur ions may be reduced in the reaction process (Zeng et al, 2019).…”

Section: Electronic Properties and Chemical Valencementioning

confidence: 95%

Layered MoS2 Grown on Anatase TiO2 {001} Promoting Interfacial Electron Transfer to Enhance Photocatalytic Evolution of H2 From H2S

Cai

Wang

Xiang

et al. 2020

Front. Environ. Chem.

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The treatment of hazardous hydrogen sulfide (H2S) via photocatalysis technology has been known as one of the most promising green technologies. Photocatalytic production of hydrogen (H2) from H2S by two-dimensional (2D) semiconductor materials has gathered great attention owing to its large surface area and high catalytic activity. In this work, layered MoS2 has been successfully grown on TiO2 {001} surface to fabricate the 2D MoS2/TiO2 {001} composites for H2 evolution from H2S, which can be confirmed by the X-ray diffraction (XRD) and transmission electron microscopy (TEM) tests. Band structures and UV-Vis spectra provide important evidences that MoS2 loading can significantly narrow the band gap and broaden the light absorbance into the visible light region. Electron transfer is obviously visualized at the interface of MoS2/TiO2, resulting in the built-in potential from TiO2 to MoS2, which is determined by the density functional theory (DFT) calculations and X-ray photoelectron spectroscopy (XPS) test. Consequently, the photo-induced electrons and holes are accumulated at the sides of TiO2 and MoS2 under the illumination, respectively, which largely promote the interfacial electron transfer and prolong the lifetime of photo-generated electrons that participate in the photocatalytic reactions of H2 evolution from H2S. This efficient separation of photo-induced carriers can be further proved by photoluminescence (PL) spectra, photocurrent responses, and electrochemical impedance spectra. As a result, the photocatalytic activity of H2 evolution is largely increased by 9.4 times compared to the pristine TiO2. This study could offer a new and facile way to design highly efficient 2D photocatalysts for the application of H2S treatment.

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“…In order to address these challenges, various carbon/sulfur matrices with optimized structures have been proposed, such as the integration of sulfur with porous carbon [8], graphene [9], graphene oxide [10][11][12][13], and carbon nanotubes [14][15][16][17]. Such unique structures can efficiently improve electronic conductivity and prevent the dissolution, diffusion, and shuttling of lithium polysulfides by physical encapsulation [18,19].…”

Section: Introductionmentioning

confidence: 99%

Revealing the working mechanism of a multi-functional block copolymer binder for lithium-sulfur batteries

Liu

Gao

et al. 2021

Journal of Energy Chemistry

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The lithium-sulfur (Li-S) battery is one of the most promising substitutes for current energy storage systems because of its low cost, high theoretical capacity, and high energy density. However, the high solubility of intermediate products (i.e., lithium polysulfides) and the resultant shuttle effect lead to rapidly fading capacity and a low coulombic efficiency, which hinder the practical application of Li-S batteries. In this study, block copolymers are constructed with both an ethylene oxide unit and a styrene unit and then used as binders for Li-S batteries. Electrochemical performance improvements are attributed to the synergistic effects contributed by the different units of the block copolymer. The ethylene oxide unit traps polysulfide, which bonds strongly with the intermediate lithium polysulfide, and enhances the transport of lithium ions to reach high capacity. Meanwhile, the styrene unit maintains cathode integrity by improving the mechanical properties and elasticity of the constructed block copolymer to accommodate the large volume changes. By enabling multiple functions via different units in the polymer chain, high sulfur utilization is achieved, polysulfide diffusion is confined, and the shuttle effect is suppressed during the cycle life of Li-S batteries, as revealed by operando ultraviolet-visible spectroscopy and S K-edge X-ray absorption spectroscopy.

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Improve the electrodeposition of sulfur and lithium sulfide in lithium-sulfur batteries with a comb-like ion-conductive organo-polysulfide polymer binder

Cited by 38 publications

References 35 publications

A novel permselective organo-polysulfides/PVDF gel polymer electrolyte enables stable lithium anode for lithium–sulfur batteries

A novel permselective organo-polysulfides/PVDF gel polymer electrolyte enables stable lithium anode for lithium–sulfur batteries

Layered MoS2 Grown on Anatase TiO2 {001} Promoting Interfacial Electron Transfer to Enhance Photocatalytic Evolution of H2 From H2S

Revealing the working mechanism of a multi-functional block copolymer binder for lithium-sulfur batteries

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