The effects of Fe@C nanoparticles on the lithium storage performance of VS4 anode

Wang, Lili; Xue, Lihong; Wang, Jinsong; Liu, Miao; Chen, Wei‐Lun; Wan, Min; Gong, Wenzhe; Liu, Qing; Zhang, Nan; Zhang, Wuxing

doi:10.1016/j.jallcom.2018.07.322

Cited by 12 publications

(3 citation statements)

References 30 publications

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“…[ 13 ] As one of the transition metal sulfides, vanadium‐based sulfides have been attracting interest due to the abundant resource and high theoretical capacity deriving in the main from their alterable valence state from V 5+ to V 0 . [ 14–16 ] The V layers of vanadium disulfide (VS 2 ) are located in the middle place between the sulfur layers and possess larger interlayer spacing of 5.76 Å, [ 17,18 ] which is much bigger than that of lithium ion (0.76 Å), [ 19 ] facilitating the dynamics process and enhancing the storage performance of lithium ions. [ 20 ] The theoretical capacity of VS 2 anode material for LIB is 466 mAh g −1 , which is superior to the 372 mAh g −1 of graphite.…”

Section: Introductionmentioning

confidence: 99%

Strengthening the Interface between Flower‐Like VS₄ and Porous Carbon for Improving Its Lithium Storage Performance

Zhao

et al. 2020

Adv Funct Materials

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Carbon materials are frequently used to improve the cycle and rate performance of VS 4 as anode material for lithium ion batteries. However, the interfacial interaction between VS 4 and carbon has not been elucidated clearly. Various VS 4 @C composites are prepared and the interface between VS 4 and porous carbon is investigated by X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, Raman spectroscopy, and first-principles calculations. The interfacial structure between VS 4 and carbon and the mechanism of flower-like VS 4 growth on carbon substrate are revealed clearly. The results indicate that C−V bonds and C−O−V bonds are formed when oxygen functional groups are introduced into the porous carbon, and the C−V bonds and C−O−V bonds accelerate the electron transport and enhance structural stability of the VS 4 @C composite. Deriving from the unique structure and robust interfacial interaction, the electrochemical performances of VS 4 @C composite are much better than that of pure VS 4 . Moreover, through the study of lithium storage mechanism of VS 4 anode, it is found that there is an irreversible amorphization change of the original VS 4 in the first cycle, and that during the following electrochemical process, the main storage behavior of lithium ions derives from the insertion−extraction reactions in the amorphous VS 4 with the reaction between V 4+ and V 3+ .

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Section: Introductionmentioning

confidence: 99%

Strengthening the Interface between Flower‐Like VS₄ and Porous Carbon for Improving Its Lithium Storage Performance

Zhao

et al. 2020

Adv Funct Materials

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“…It is composed of V 4+ ions that are coordinated with sulfur-containing dimeric S 2 2– species . Performance-wise, VS 4 , when used as an electrode material, − demonstrates an exceptionally high theoretical capacity of 1196 mAh/g, a finding ascribable not only to its rich redox chemistry and high sulfur content but also to its linear-chain-like structure, which likely facilitates its favorable charge-transfer kinetics, due to weak neighboring-chain interactions . Specifically, its loose stacking structure, constructed from atomic chains held together by weak van der Waals forces and characterized by an interval of 5.83 Å, provides for a number of potential sites for ion insertion/extraction.…”

Section: Introductionmentioning

confidence: 99%

Microwave-Based Synthesis of Functional Morphological Variants and Carbon Nanotube-Based Composites of VS₄ for Electrochemical Applications

Salvatore

Tan

Tang

et al. 2020

ACS Sustainable Chem. Eng.

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A novel facile, fast, and efficient microwave-assisted method was developed to synthesize a number of diverse nanostructured motifs (ranging from nanorods to nanoflowers) of VS 4 along with its associated composite heterostructures, VS 4 / multi-walled carbon nanotube (MWNT; i.e., multi-walled carbon nanotubes). In particular, we have probed and correlated the effects of a number of specific experimental variables, including primarily precursor, solvent, temperature, and time. We noted that nanorods formed more readily with VO(acac) 2 as the vanadium precursor and n-methyl-2-pyrrolidone (NMP) as a polar reaction solvent. By contrast, we determined that hierarchical three-dimensional (3D) nanoflower-like assemblies, ranging in size from 100 to 200 nm in average diameter, could be controllably synthesized by using Na 3 VO 4 as the vanadium precursor and an aqueous water: polar solvent mixture as the reaction medium. We also observed that VS 4 disintegrates, when in the presence of either air, solution, or a combination of these environments, and established that the extent of VS 4 nanorod decomposition could be almost fully prevented by storage under nitrogen. From an application's perspective, our VS 4 is electrochemically active and shows behavior, consistent with the literature. In particular, as compared with pristine VS 4 nanorods alone, we observed enhanced electrochemical activity with (i) 3D hierarchical flower-like motifs, (ii) unique necklace-like VS 4 nanorod−MWNT composites, and (iii) samples in which as-prepared VS 4 nanorods had been annealed. Moreover, we found that the rational application of specific physical and chemical processing treatments, such as (i) thermal annealing to improve crystallinity, (ii) the addition of MWNTs to form conductive composites, and (iii) the evolution of morphology from onedimensional (1D) nanorods to more complex 3D nanoflowers, was favorable to the resulting electrochemical performance with respect to increasing stability and reversibility.

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“…Among them, transition-metal chalcogenides have been extensively investigated because of their inherent advantages including high theoretical capacity, low cost, natural abundance, and intrinsic safety. − In recent years, patronite (VS 4 ) has attracted growing academic interest because of its unique crystal structure and high theoretical capacity. − Patronite VS 4 is monoclinic and belongs to the space group I 2/ c in which VS 8 enneahedron, composed of V 4+ ions coordinated to disulfur dianion (S 2 2– ), extends along the c axis by alternately sharing the edge and surface, forming a unique one-dimensional (1D) chain structure (Figure S1a). − The theoretical capacity of the VS 4 anode for a lithium battery could be determined as 1196 mA h g –1 (VS 4 + 8Li + + 8e – ↔ 4Li 2 S + V), , and its potential advantages can be summarized as follows: (1) because the 1D chains are primarily bonded together through the van der Waals force, the large spacing between the chains can provide more potential storage sites for the lithium ion and rapid channels for charge mobility (Figure S1b), thereby improving the charge-transfer kinetics; (2) a high content of sulfur (71.6 wt %) can not only ameliorate the polarity of electrode materials but also improve the contact with the electrolyte solution; and (3) the variety of vanadium oxidation states and the transformation reaction between S 2 2– and S 2– are conducive to improving the theoretical capacity . To date, considerable efforts have been dedicated to exploring the lithium-ion storage mechanism and improving the electrochemical performance of the VS 4 anode. ,,− Unfortunately, the huge volume expansion/contraction and sluggish electrode reaction kinetics during charge/discharge processes would lead to pulverization of the active materials and poor electrical contact between the current collector and the active materials, causing a rapid degradation of the capacity.…”

Section: Introductionmentioning

confidence: 99%

Design and Synthesis of a Reduced Graphene Oxide/Patronite Composite with Enhanced Lithium-Ion Storage Performance

Liu

Wang

et al. 2019

ACS Appl. Mater. Interfaces

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The construction of graphene-based composites is a novel electrode material design strategy and has become a promising field in new energy material research. However, the rational design principle is still poorly understood, and the synthetic technology urgently needs to be expanded. Here, a novel strategy for the synthesis of a reduced graphene oxide (rGO)/VS4 nanoparticle (NP) composite is reported using an ionic liquid (IL)-assisted hydrothermal method. The synergistic effects of graphene and IL, which include the π–cation/anion interactions of graphene, the capping agent effect of IL, and their π–π stacking interaction, are responsible for the synthesis of the composite, achieving delicate tailoring of VS4 NPs as well as their homogeneous dispersal on the surface of rGO nanosheets. The superior nanostructure of the composite results in enhanced lithium-ion storage performance, such as improved cyclic stability (1009 mA h g–1 at 0.1 A g–1 after 150 cycles and 788 mA h g–1 after 240 cycles even at 1 A g–1) and rate capability (1540 and 621 mA h g–1 at 0.1 and 2 A g–1, respectively). This strategy provides an effective new approach for designing graphene composites and is expected to be applicable in the design of other rGO/transition-metal sulfide composites for energy storage.

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The effects of Fe@C nanoparticles on the lithium storage performance of VS4 anode

Cited by 12 publications

References 30 publications

Strengthening the Interface between Flower‐Like VS₄ and Porous Carbon for Improving Its Lithium Storage Performance

Strengthening the Interface between Flower‐Like VS₄ and Porous Carbon for Improving Its Lithium Storage Performance

Microwave-Based Synthesis of Functional Morphological Variants and Carbon Nanotube-Based Composites of VS₄ for Electrochemical Applications

Design and Synthesis of a Reduced Graphene Oxide/Patronite Composite with Enhanced Lithium-Ion Storage Performance

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The effects of Fe@C nanoparticles on the lithium storage performance of VS4 anode

Cited by 12 publications

References 30 publications

Strengthening the Interface between Flower‐Like VS4 and Porous Carbon for Improving Its Lithium Storage Performance

Strengthening the Interface between Flower‐Like VS4 and Porous Carbon for Improving Its Lithium Storage Performance

Microwave-Based Synthesis of Functional Morphological Variants and Carbon Nanotube-Based Composites of VS4 for Electrochemical Applications

Design and Synthesis of a Reduced Graphene Oxide/Patronite Composite with Enhanced Lithium-Ion Storage Performance

Contact Info

Product

Resources

About

Strengthening the Interface between Flower‐Like VS₄ and Porous Carbon for Improving Its Lithium Storage Performance

Strengthening the Interface between Flower‐Like VS₄ and Porous Carbon for Improving Its Lithium Storage Performance

Microwave-Based Synthesis of Functional Morphological Variants and Carbon Nanotube-Based Composites of VS₄ for Electrochemical Applications