JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Donghong Duan,Kaixin Chen,Chongzhi Xing,Xiaoqiang Wang,Xianxian Zhou,Shibin Liu
The development of lithium-sulfur (Li-S) batteries necessitates the creation of efficient cathode materials . By simultaneous phosphating and sulfurating, a spindle-shaped CoP-Co 3 S 4 heterostructure sulfur cathode substrate made up of numerous tiny needle-like structures is created. The benefits of CoP with outstanding conductivity and Co 3 S 4 with great adsorption capacity are combined in the as-prepared CoP-Co 3 S 4 heterostructures, which achieve efficient capture-diffusion-transformation of polysulfides at the interface. The CoP accelerates the redox kinetics toward polysulfide conversion, and the Co 3 S 4 has a considerable adsorption power toward polysulfides. The quick nucleation of polysulfide and increased capture effectiveness are aided by the quick transfer of polysulfide from the Co 3 S 4 surface to the CoP surface. As a result, the CoP-Co 3 S 4 @S cathode battery with a 1.1 mg cm −2 sulfur load achieves a high initial capacity of 1516.9 mAh g −1 at 0.2 C and maintains that capacity after 100 cycles at 750.1 mAh g −1 . After 300 cycles, even the 565.1 mAh g −1 specific capacity can be attained at 1 C.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Qiuyang Ma,Qiqi Liu,Zhongyuan Li,Jun Pu,Jawayria Mujtaba,Zhen Fang
The practical applications of room-temperature sodium-sulfur (RT Na-S) batteries have been greatly hindered by the natural sluggish reaction kinetics of sulfur and the shuttle effect of sodium polysulfide (NaPSs). Herein, oxygen vacancy (OV)-mediated amorphous GeO x /nitrogen doped carbon (donated as GeO x /NC) composites were well designed as sulfur hosts for RT Na–S batteries. Experimental and density functional theory studies show that the introduction of oxygen vacancies on GeO x /NC can effectively immobilize polysulfides and accelerate the redox kinetics of polysulfides. Meanwhile, the micro-and mesoporous framework, acting as a reactor for storing active S, is conducive to alleviating the expansion of S during the charging/discharging process. Consequently, the S@GeO x /NC cathode affords a reversible capacity of 1017 mA h g −1 at 0.1 A g −1 after 100 cycles, outstanding rate capability of 333 mA h g −1 at 10.0 A g −1 and long lifespan cyclability of 385 mAh g −1 at 1 A g −1 after 1200 cycles. This work furnishes a new way for the rational design of metal oxides with oxygen vacancies and boosts the application for RT Na-S batteries.
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Nanomaterials
·
2022
·Vol. 12
·期 15
·2513
·
IF 5.719
Jifeng Gu,Jiaping Zhang,Yun Su,Xu Yu
The separators with high absorbability of polysulfides are essential for improving the electrochemical performance of lithium–sulfur (Li–S) batteries. Herein, the aramid fibers coated polyethylene (AF-PE) films are designed by roller coating, the high polarity of AFs can strongly increase the binding force at AF/PE interfaces to guarantee the good stability of the hybrid film. As confirmed by the microscopic analysis, the AF-PE-6 film with the nanoporous structure exhibits the highest air permeability by the optimal coating content of AFs. The high absorbability of polysulfides for AF-PE-6 film can effectively hinder the migration of polysulfides and alleviate the shuttle effect of the Li–S battery. AF-PE-6 cell shows the specific capacity of 661 mAh g−1at 0.1 C. After 200 charge/discharge cycles, the reversible specific capacity is 542 mAh g−1with the capacitance retention of 82%, implying the excellent stability of AF-PE-6. The enhanced cell performance is attributed to the porous architecture of the aramid layer for trapping the dissolved sulfur-containing species and facilitating the charge transfer, as confirmed by SEM and EDS after 200 cycles. This work provides a facile way to construct the aramid fiber-coated separator for the inhibition of polysulfides in the Li–S battery.Keywords:nanoporous;aramid fibers;polysulfides;Li–S battery
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ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Wentong Fan,Miao Jiang,Gaozhan Liu,Wei Weng,Jing Yang,Xiayin Yao
All-solid-state lithium/sulfide batteries are considered as next-generation high-energy-density batteries with unrivaled safety. However, sulfide cathodes generally suffer from insulating properties and huge volume expansion in all-solid-state lithium batteries. Based on amorphous TiS4 (a-TiS4), a certain proportion of Super P is introduced to suppress the volume expansion and increase the electronic conductivity. Meanwhile, a Li7P3S11 solid electrolyte is in situ coated on the surface of 20% Super P/a-TiS4, and the close interfacial contact between the active material and the solid electrolyte constructs a favorable ionic conduction path. As a result, a Li/75% Li2S-24% P2S5-1% P2O5/Li10GeP2S12/20% Super P/a-TiS4@Li7P3S11 battery shows a high reversible capacity of 507.4 mAh g–1 after 100 cycles at 0.1 A g–1. Even the current density increases to 1.0 A g–1, and it can also provide a reversible capacity of 349.8 mAh g–1 after 200 cycles. These results demonstrate a promising 20% Super P/a-TiS4@Li7P3S11 cathode material with electronic/ionic conduction networks for all-solid-state lithium batteries.
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Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 36
·12261-12269
·
IF 6.4
Ying-Jie Ma,Jing-Wen Wang,Guo-Chao Zhuang,Yang Zhang,Zi-Long Zhang,Ming-Yue Zhang,Guang-Bin Ji
To overcome the effect of high actuation voltages causing dielectric elastomer films to breakdown, fabricating films with excellent dielectric properties and high durability is the current focus. Previously reported dielectric elastomer films, nevertheless, still require better dielectric properties and suffer from a lack of self-healing properties, which reduces the service life of the films. In this work, polysulfide polyurethane–urea (PSPU) elastomers with self-healing properties were synthesized through the insertion of dynamic disulfide bonds into the polymer chain segments via hydrogen transfer reactions. In addition, PSPU-based composites were fabricated in which the filler was MXene loaded with CeO2 obtained using a hydrothermal method. Benefiting from dynamic disulfide bonding and multiple hydrogen bonding interactions, PSPU attained a self-healing efficiency of 95%. Moreover, the 5.25 vol% CeO2@MXene/PSPU composite exhibited a dielectric constant of 206 at 100 Hz, maintaining a loss of 0.19 while having a self-healing efficiency of 97.9%. In contrast to PSPU, the dielectric constant of 5.25 vol% CeO2@MXene/PSPU was 34 times higher than that of the former at 100 Hz. These distinctive properties promise to render the films an integral part of the actuator.
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Shiwei Ge,Qian Zhao,Yaoyang Liu,Fangfang Wang,Guijuan Wei,Yu Liu,Bin Xu
Lithium–sulfur (Li–S) batteries are considered as promising energy storage systems due to the high energy density of 2600 W h kg–1. However, the practical application of Li–S batteries is hindered by the inadequate conductivity of sulfur and Li2S, as well as the shuttle effect caused by polysulfides during the charge–discharge process. Introducing a conductive interlayer between the cathode and the separator to physically resist polysulfides represents an effective and straightforward approach to mitigate the shuttle effect in Li–S batteries. In this paper, an ultrathin (<1 μm) 2D–2D MXene-LDH interlayer with high polysulfide adsorption ability was introduced to Li–S batteries. The synergistic effect between MXene and layered double hydroxide greatly improved the adsorption effect of the interlayers: the conductive Ti3C2Tx MXene chemically adsorbs polysulfides and promotes their fast transfer, and the NiCo-LDH alleviates the restack of MXene and facilitates Li+ diffusion. After inserting the MXene-LDH interlayer, the Li–S batteries exhibit an enhanced specific capacity of 1137.6 mA h g–1 at 0.1 C and retain 622.6 mA h g–1 after 100 cycles. The ultrathin 2D–2D interlayer offers a feasible way for the development of highly efficient and lightweight interlayers in Li–S batteries.
研究领域:
材料科学
·
能源存储技术
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ACS Applied Polymer Materials
·
2024
·
IF 4.4
Yuanhao Shi,Dongxia Li,Xiangfeng Sun,Yuxin Xue,Zhiqi Li,Yulin Fu,Chongxian Luo,Qiong Lin,Xuefeng Gui,Kai Xu
Lithium–sulfur (Li–S) batteries, possessing substantial capacity, present a promising successor to current lithium-ion batteries, but the “shuttle effect” during cycling and deficient lithium-ion conductivity in Li–S batteries limit their practical applications. One potential remedy to these issues lies in the use of functional binders. In this study, building on the exceptional electrochemical stability of poly(vinylidene fluoride) (PVDF), we strategically grafted the cationic monomer 1-butyl-3-vinylimidazole with bis(trifluoromethanesulfonyl)imide (TFSI–) coordination from the chain of PVDF, thereby engineering the ionomer binder PVDF-g-(1-butyl-3-vinylimidazolium bis((trifluorompropyl)sulfonyl)imide) (BVIM). Density-functional theory (DFT) calculations affirmed that these cationic polymer branches, possessing a high binding energy with lithium polysulfides (LiPSs), are effective in trapping the LiPSs generated at the cathode. Moreover, while adsorbing LiPSs the TFSI– originally coordinated with the branched chain will be displaced, forming a dynamic small molecule pathway in the cathode that promotes lithium-ion conduction. As a result, Li–S batteries with BVIM binders deliver a persistent reversible capacity of 792.5 mAh g–1 over 250 cycles at a rate of 0.5C. Concurrently, at a high sulfur loading of 5.5 mg cm–2, a specific capacity of 3.3 mAh cm–2 was maintained after 50 cycles at 0.2C.
研究领域:
材料科学
·
电化学
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ChemSusChem
·
2024
·
IF 7.5
Jiaqi Zhao,Zhanwei Xu,Yujiao Zhang,Jin QingZhu,Longhua Guo,Siyu Chen,Xuetao Shen,Jiayin Li,Zhi Li
The sluggish transition and shuttle of polysulfides (LiPS) significantly hinder the application and commercialization of Li-S batteries. Herein, carbon nanotubes (CNTs) supported 10 nm sized iron Hexadecafluorophthalocyanine (FePcF16/CNTs) are prepared using a solid synthesis approach. The well-exposed FePcF16 molecular improve the LiPS capture efficiency and redox kinetics by its central Fe-N4 units and F functional groups. The strong electron withdraw F groups significantly promote the conjugate effect and decrease the steric hindrance during mass migration procedure. Distribution of relaxation time (DRT) analysis shows that the Fe-N4 units exhibit strong affinity towards LiPS and the F groups further improve the Li+ diffusion rate in Li2S nucleation and oxidation procedure, accomplishing a porous surface on cathode. As a result, the FePcF16/CNTs separator exhibits a high initial capacity of 1136.2 mAh g-1 at 0.2 C, outstanding rate capacity of 624.9 mAh g-1 at 5 C and superior long-term stability at 2 C surviving 300 cycles with a low capacity decay of 0.43‰ per cycle.
研究领域:
材料科学
·
电化学
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ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Qifan Peng,Fan Yu,Weikun Wang,Anbang Wang,Feng Wang,Yaqin Huang
Lithium-sulfur (Li-S) battery has been regarded as one of the most promising next-generation energy storage systems, due to its high energy density and low cost. However, the dissolution of polysulfides to electrolyte and consequent “shuttle effect” still hinder the application of Li-S battery. Here, a polyethylenimine/fish-scale based porous carbon composite (PFPC) with abundant active sites and a relatively compact morphology is prepared by wet impregnation method. Modified separator with the PFPC coating significantly improves the rate capability and cycle stability of Li-S battery. The Li-S battery with the PFPC separator shows a reversible capacity of 638 mAh g −1 after stably cycling for 400 cycles at 1.0 C (1.0 C = 1675 mA g −1 ) with an ultralow capacity fading rate of 0.030% per cycle. The improved electrochemical performance of Li-S battery can be attributed to the synergistic effect of physical blocking and chemical adsorption of PFPC for polysulfides and the fast electron conduction between adsorbed polysulfides and conductive network. Moreover, the PFPC separator is ultralight with a mass loading of about 0.04 mg cm −2 . The good electrochemical performance, facile preparation method and light weight make the PFPC separator promising for the Li-S battery application.
研究领域:
材料科学
·
电化学
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2026
·
IF 3.1
Yong Wang,Rongjun E,Hongxia Li,Yu Li,Yu Li
This study investigates the synergistic flame-retardant and smoke-suppression effects of an aluminum hydroxide/antimony pentoxide (ATH/Sb 2 O 5 ) composite in epoxy-modified polysulfide rubber (PSR), and explores the underlying synergistic mechanism. Compared to PSR containing ATH or Sb 2 O 5 alone, the ATH/Sb 2 O 5 -PSR composite demonstrates a significantly higher limiting oxygen index (LOI) of 27.7%, a lower peak heat release rate (pHRR) of 208.9 kW/m 2 , and a reduced total smoke release (TSR) of 174.9 m 2 /m 2 . This synergy not only effectively enhances the flame retardancy of PSR but also suppresses the release of toxic gases, notably SO 2 .
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Bin Fan,Weikun Chen,Qian He,Bigui Zhou,Zhiyun Xu,Wei Liu,Qingya Wei,Yingping Zou
To achieve the practical application of high energy density lithium–sulfur (Li–S) batteries, it is essential not only to enhance lithium-ion (Li + ) transport but also to effectively suppress the lithium polysulfides (LiPSs) shuttle effect, which remains challenge for the conventional commercial separators. In this study, a fluorinated covalent organic framework (Tp-TFAB COF) material with high selective permeability was employed to modify separators for Li–S batteries. The fluorinated Tp-TFAB COF layer can effectively enhance Li + conduction while providing electrostatic shielding against LiPSs, which were also confirmed by density functional theory calculations. As a result, Li–S batteries with Tp-TFAB/PP-modified separators retained 79.4 % of their initial capacity after 800 cycles at a 0.5C rate, with a low capacity decay of 0.026 % per cycle. Even at a high sulfur loading (7.3 mg cm −2 ), the batteries exhibited an impressive areal capacity of 5.83 mAh cm −2 . This work highlights the selective functionality of the fluorinated COFs nanoscopic channels, demonstrating its potential for applications in energy storage and beyond.
研究领域:
材料科学
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电化学
·
能源存储
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Materials Today Chemistry
·
2025
·
IF 6.7
Di Wang,Ya Yang,Shiyi Liu,Hailong Yan,Jinbing Cheng,Yang Lu,Yongsong Luo,Hui Ying Yang
Lithium-sulfur (Li–S) batteries face significant challenges, including capacity fading and restricted rate performance, primarily caused by the passivation of active materials, the polysulfide shuttle phenomenon, and sluggish redox reactions. To address these issues, a composite material comprising CoSe quantum dots (QDs)/NiO PCNFs (porous carbon nanofibers) has been designed and synthesized. This innovative design enhances the accessibility of active sites, which play a vital role in effectively anchoring and converting lithium polysulfides (LiPSs). The CoSe quantum dots (QDs) embedded in NiO porous carbon nanofibers (PCNFs) leveraged the synergistic interactions between their components to achieve exceptional cyclic stability, maintaining an ultra-low capacity decay rate of 0.034 % per cycle over 500 cycles at a current density of 2 C. The heterostructure and the built-in electric field (BIEF) work in concert to mitigate the polysulfide shuttle effect and promote faster electron and lithium-ion transport. This advanced architecture presents a promising strategy for enhancing the energy density and cycle lifespan of Li–S batteries, advancing their potential for practical implementation.
研究领域:
材料科学
·
能源存储技术
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