Ultrathin TiO2 surface layer coated TiN nanoparticles in freestanding film for high sulfur loading Li-S battery

Qi, Congyu; Cai, Mingli; Zheng, Li; Jin, Jun; Chowdari, B. V. R.; Chen, Chunhua; Zhang, Wen

doi:10.1016/j.cej.2020.125674

Cited by 38 publications

(17 citation statements)

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“…We subsequently examined the X-ray photoelectron spectroscopy (XPS) of the oxide powders after trapping the polysulfides after the adsorption analysis to understand the polysulfide adsorption chemistry of different oxide materials (Figure ). The XPS S 2p spectra of the oxide materials shown in Figure a display three main peaks, which are identified as the peak at 169.3–168.8 eV that is ascribed to the polythionate complex, the peak at 167.0–166.8 eV that is ascribed to thiosulfate, and the peaks at 164.8–163.0 and 163.0–162.1 eV that are ascribed to the S b 0 and S t –1 of polysulfides, respectively. ,− Specifically, the identified polythionate complex suggests the trapped long-chain polysulfide, while the inspected thiosulfate is a short-chain polysulfide, which might be the product of the redox reaction between the oxide powders and their trapped polysulfide species. , The terminal S t –1 and bridge S b are the bonding of polysulfide molecules. The XPS spectra of the metal elements of the individual oxide powder before and after the polysulfide adsorption analysis are summarized in Figure b–f, which are presented as TiO 2 , ZrO 2 , SiO 2 , ZnO, and Al 2 O 3 in sequence.…”

Section: Resultsmentioning

confidence: 98%

Investigation and Design of High-Loading Sulfur Cathodes with a High-Performance Polysulfide Adsorbent for Electrochemically Stable Lithium–Sulfur Batteries

Huang

Hsiang

Chung

2022

ACS Sustainable Chem. Eng.

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Sulfur cathodes are inexpensive and exhibit a high theoretical charge-storage capacity of 1672 mA•h g −1 . Consequently, electrochemical lithium−sulfur batteries can attain a high gravimetric energy density of 400−600 W•h kg −1 . Practical high-performance sulfur cathodes depend on the efficient electrochemical utilization of active solid-state materials and high electrochemical stability of active liquid-state materials in cells with high amounts of sulfur. In this study, we systematically investigate a series of oxide-based polysulfide adsorbents that exhibit chemical polysulfide-trapping and electrocatalytic conversion capabilities. After ruling out the possibility of the physical adsorption of polysulfides, various types of oxides are used to develop a cathode with high sulfur loading values of 3.0 and 4.0 mg cm −2 and a sufficient sulfur content of 60 wt %. The analytical results indicate that the presence of SiO 2 promotes the adsorption and conversion of a high amount of polysulfides. The prepared high-loading sulfur cathodes optimized through the use of a SiO 2 adsorbent exhibit a high charge-storage capacity (895 mA•h g −1 ), a long cycle life (200 cycles), a high rate performance (C/20−C/2), and a high sulfur loading capability (8.0 mg cm −2 ) while maintaining a high areal capacity (3.7 mA•h cm −2 ) and a high energy density (7.9 mW•h cm −2 ).

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Section: Resultsmentioning

confidence: 98%

Investigation and Design of High-Loading Sulfur Cathodes with a High-Performance Polysulfide Adsorbent for Electrochemically Stable Lithium–Sulfur Batteries

Huang

Hsiang

Chung

2022

ACS Sustainable Chem. Eng.

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“…Instead, the two anodic peaks can be attributed to the oxidation of Li 2 S toward soluble Li 2 S x and sulfur, respectively. [31][32][33][34] Compared to the peaks of the V 2 O 5 -S and C-S cathodes, the cathodic peaks shift to higher potential, and the anodic peak shift to lower potential for the VN/V 2 O 5 -S cathode. The significantly different results indicated relatively enhanced reaction kinetics for LiPSs redox by adding VN/V 2 O 5 host as compared to V 2 O 5 and C. Moreover, the rate capabilities of the VN/V 2 O 5 -S, V 2 O 5 -S, and C-S cathodes were evaluated by the GCD profiles from 0.2 to 5C per every 5 cycles and returning to 1C and 0.2C.…”

Section: Resultsmentioning

confidence: 99%

“…Since most of these polar hosts are poorly conductive and slightly catalytically active, they still need to be combined with high conductivity catalysts to ensure their fast trapping, localization, and conversion capabilities for Li 2 S. Recently, some prospective researchers have been devoted to tackling the above problems by introducing catalysts into host materials. Until now, various hosts with catalysts, including VO 2 –VN, 32 TiO 2 –TiN, 33,34 MoS 2 –GN, 31 WS 2 –WO 3 , 7 TiN–VN, 27 etc . have been developed to accelerate the LiPSs conversion and effectively suppress their shuttling in the Li–S batteries.…”

Section: Introductionmentioning

confidence: 99%

Multifunctional integrated VN/V₂O₅ heterostructure sulfur hosts for advanced lithium–sulfur batteries

Liu

Shi

et al. 2022

Nanoscale

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“…Lithium-sulfur (Li-S) batteries with energy density of 2600 Wh kg -1 , which is several times higher than the stateof-the-art lithium-ion batteries, are promising candidates for next generation energy storage devices. [1][2][3] Unfortunately, the commercialization of Li-S batteries has been plagued by some intrinsic and fundamental challenges, including the dissolution of lithium polysulfide in ether electrolytes and the insulating nature of sulfur-related species. The former leads to rapid capacity declining, low Coulombic efficiency and the latter causes low sulfur utilization and failure of Li-S batteries.…”

Section: Introductionmentioning

confidence: 99%

Microregion Welding Strategy Prevents the Formation of Inactive Sulfur Species for High‐Performance Li–S Battery

Gan

et al. 2021

Advanced Energy Materials

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Numerous efforts have been devoted to addressing the abovementioned challenging issues and great progresses have been achieved during the past decades. [8][9][10][11] Nanostructured carbon-based materials with high electrical conductivities, large surface areas, and hierarchical pores are first applied as sulfur hosts to promote the performance of Li-S batteries. [12,13] Unfortunately, most carbon/sulfur electrodes show poor cycling performance and low Coulombic efficiency, especially under high areal sulfur loading condition. Up to now, more studies suggest that the weak interaction between carbon-based materials and lithium polysulfide results in the degradation of Li-S batteries. [14][15][16] Therefore, effective trapping of lithium polysulfide in cathodes has been considered to be a superior way to achieve high-performance Li-S batteries. Carbon-based hollow spheres, core-shell structure and heteroatom doping, which suppress polysulfide dissolution through physical and chemical strategies, are applied. [17][18][19] Recently, there is an increasing interest in polar transition metal composites which show stronger adsorption to lithium polysulfide than carbon-based materials. Numerous transition metal composites including metal oxide, [20,21] metal carbide, [22] metal sulfide, [23] metal nitride, [24] and metal phosphide, [25] all suffer from inferior electronic conductivity compared with carbon-based materials, and limited specific surface area for the adsorption and conversion reaction of sulfur species. In fact, in most cases, chemical confinement of lithium polysulfide is rather limited for promoting Li-S batteries performance because the trapped lithium polysulfide is hard to be effectively converted due to the sluggish redox kinetics. [26] Meanwhile, the abovementioned solutions can achieve good results under low areal sulfur loading condition, but are powerless with high areal sulfur loading. Therefore, the failure mechanism of Li-S batteries is still controversial and the new and effective solution is urgent to be find out.Recently, the conceptions of "dead sulfur," "dead sulfur layer," "inactive sulfur" have been proposed and show significant importance in Li-S batteries studies. [27][28][29][30] They all point out that the agglomeration and deposition of inactive sulfur relatedspecies during the discharging-charging cycles are main performance degradation factors for Li-S batteries. Our research also found out that the "dead sulfur layer" can even cause the complete failure of Li-S batteries. [28] Therefore, exploring the reasons An in-depth understanding of Li-S battery failure mechanisms is of significance for providing design guidance of promoting this class of batteries' electrochemical performance. During discharge, deposition of solid sulfur species on substrates is observed, leading to large contact resistance and sluggish redox kinetics. Then, the cumulative effect leads to the formation of isolated inactive sulfur species on low-dimensional substrates (0D, 1D, and 2D), which has been confirme...

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Ultrathin TiO2 surface layer coated TiN nanoparticles in freestanding film for high sulfur loading Li-S battery

Cited by 38 publications

References 37 publications

Investigation and Design of High-Loading Sulfur Cathodes with a High-Performance Polysulfide Adsorbent for Electrochemically Stable Lithium–Sulfur Batteries

Investigation and Design of High-Loading Sulfur Cathodes with a High-Performance Polysulfide Adsorbent for Electrochemically Stable Lithium–Sulfur Batteries

Multifunctional integrated VN/V₂O₅ heterostructure sulfur hosts for advanced lithium–sulfur batteries

Microregion Welding Strategy Prevents the Formation of Inactive Sulfur Species for High‐Performance Li–S Battery

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Ultrathin TiO2 surface layer coated TiN nanoparticles in freestanding film for high sulfur loading Li-S battery

Cited by 38 publications

References 37 publications

Investigation and Design of High-Loading Sulfur Cathodes with a High-Performance Polysulfide Adsorbent for Electrochemically Stable Lithium–Sulfur Batteries

Investigation and Design of High-Loading Sulfur Cathodes with a High-Performance Polysulfide Adsorbent for Electrochemically Stable Lithium–Sulfur Batteries

Multifunctional integrated VN/V2O5 heterostructure sulfur hosts for advanced lithium–sulfur batteries

Microregion Welding Strategy Prevents the Formation of Inactive Sulfur Species for High‐Performance Li–S Battery

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Multifunctional integrated VN/V₂O₅ heterostructure sulfur hosts for advanced lithium–sulfur batteries