MoS<sub>2</sub>‐Based Nanocomposites for Electrochemical Energy Storage

Wang, Tianyi; Chen, Shuangqiang; Pang, Huan; Xue, Huaiguo; Yu, Yan

doi:10.1002/advs.201600289

Cited by 416 publications

(227 citation statements)

References 177 publications

(314 reference statements)

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“…The XRD pattern of the MoS 2 nanospheres shows three dominant peaks of hexagonal crystalline 2H-MoS 2 (JCPDS: 37-1492). These three peaks, corresponding to the (002), (100), and (110) planes, emerge at 13.5°, 33.3°, and 58.9° [16], respectively. After thin layer carbon coating, the XRD pattern of the MoS 2 /C spheres does not show any obvious changes from pure the MoS 2 spheres sample, except for the appearance of a broad peak at ~ 22° associated with amorphous carbon and a decrease in the intensity of the (100) plane peak of MoS 2 , due to the thin layer carbon coating [36,37].…”

Section: Resultsmentioning

confidence: 98%

“…While silicon anodes possess an initial capacity around 3,500 mAh/g when tested at low rates (e.g., 0.1 C), they retain minimal capacity at high rates (e.g., 10 C) or after long term cycling due to their 280% volumetric expansion upon full lithiation and related unstable solid electrolyte interface [12]. In addition, nanostructured MoS 2 routinely outperforms its bulk equivalent in terms of capacity retention, rate capability, and cycle life, due to shorter lithium diffusion distances and higher concentrations of active edge sites, which further enhance their lithium storage capability [11,16,17].…”

Section: Introductionmentioning

confidence: 99%

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MoS2/C/C nanofiber with double-layer carbon coating for high cycling stability and rate capability in lithium-ion batteries

Hou

Shen

et al. 2018

Nano Res.

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MoS 2 has attracted a lot of interest in the field of lithium-ion storage as an anode material owing to its high capacity and two-dimensional (2D)-layer structure. However, its electrochemical properties, such as rate capability and cycling stability, are usually limited by its low conductivity, volume variation, and polysulfide dissolution during lithiation/delithiation cycling. Here, a designed two-layer carbon-coated MoS 2 /carbon nanofiber (MoS 2 /C/C fiber) hybrid electrode with a double-layer carbon coating was achieved by a facile hydrothermal and subsequent electrospinning method. The double carbon layer (inner amorphous carbon and outer carbon fiber) shells could efficiently increase the electron conductivity, prevent the aggregation of MoS 2 flakes, and limit the volume change and polysulfide loss during long-term cycling. The as-prepared MoS 2 /C/C fiber electrode exhibited a high capacity of up to 1,275 mAh/g at a current density of 0.2 A/g, 85.0% first cycle Coulombic efficiency, and significantly increased rate capability and cycling stability. These results demonstrate the potential applications of MoS 2 /C/C fiber hybrid material for energy storage and may open up a new avenue for improving electrode energy storage performance by fabricating hybrid nanofiber electrode materials with double-layer carbon coatings.

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Section: Resultsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

MoS2/C/C nanofiber with double-layer carbon coating for high cycling stability and rate capability in lithium-ion batteries

Hou

Shen

et al. 2018

Nano Res.

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“…The MoS 2 nanosheets are closely attached to the surface of HCS to form the outer shell. [27] The HCS can not only reduce the volume strain of NaPSs during cycling but also can increase the conductivity of S. Meanwhile, nanocarbon subunits are able to reduce the transmission resistance of electrons and ions upon cycling, thereby maximizing the utilization of S. In addition, polar MoS 2 nanosheets on the surface of the carbon spheres for effective adsorption of NaPSs reduce the shuttle of intermediates to prolong the life cycle of the battery. High-resolution TEM images show that each MoS 2 nanosheet is composed of several layers.…”

Section: Resultsmentioning

confidence: 99%

Design and Construction of Sodium Polysulfides Defense System for Room‐Temperature Na–S Battery

et al. 2019

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popularization and application of this technology can not only reduce the environmental pollution caused by burning fossil fuels, but also address the issue of the intermittency of green energy resources including wind and solar energy, providing convenience for the life and development of human society. Therefore, it is crucial to explore and develop an energy storage system which is capable of supplementing existing limited energy density and long cycle life of lithium-ion battery (LIBs). [1][2][3] Recently, room-temperature Na-S batteries have attracted much attention because of their high theoretical specific capacity (1675 mAh g −1 ) and energy density (1274 Wh kg −1 ) as well as abundant Na and S resources in the Earth's crust. [4][5][6][7] These advantages make the room-temperature Na-S battery have broad application prospects in large-scale power grid equipment.However, there are still some burning questions that need to be solved in room-temperature Na-S battery: first, the active S has poor conductivity, resulting in slow electrochemical reaction kinetics and low utilization. [8,9] Second, Na-S batteries have a higher volume expansion than lithium-sulfur batteries (LSBs), which makes the cathode structure of Na-S batteries prone to collapse. [10] Finally, sodium polysulfides generated in the multistep reaction have high reactivity and solubility and are easy to diffuse to the sodium anode, resulting in serious "shuttle effect" that leads to a significant reduction in capacity. [11][12][13] Some progresses have been made in improving the poor conductivity of S and reaction kinetics of room-temperature Na-S batteries. [14][15][16] For example, porous carbon materials with good electrical conductivity can be combined with S to enhance the electrical conductivity of the cathode, such as carbon nanofiber, [17,18] carbon cloth, [19] carbon nanotube, [20,21] etc. Introducing carbon matrix can not only improve the utilization of S, but also are able to efficiently accommodate the volume expansion due to their abundant porous structure. For example, Wang et al. have constructed a Na-S battery using S@interconnected mesoporous carbon hollow nanospheres as the cathode. The results showed that the battery can deliver a good capacity of ≈390 and 127 mAh g −1 at 0.1 and 5 A g −1 , respectively. But these batteries can only cycle for 200 cycles. [22] Although the S/carbon hybrid design can immensely improve the utilization of S, it has to be pointed out that it is difficult to achieve complete electrochemical reversibility because the Room-temperature Na-S batteries are facing one of the most serious challenges of charge/discharge with long cycling stability due to the severe shuttle effect and volume expansion. Herein, a sodium polysulfides defense system is presented by designing and constructing the cathode-separator double barriers. In this strategy, the hollow carbon spheres are decorated with MoS 2 (HCS/MoS 2 ) as the S carrier (S@HCS/MoS 2 ). Meanwhile, the HCS/MoS 2 composite is uniformly coated on the surface...

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“…[4][5][6] However, the larger ionic radius of Na + (1.02 vs Li + 0.76 Å) leads to sluggish electrochemical kinetics, larger volume change, and unsatisfactory reversibility. [12][13][14] However, conductivity and Na + diffusion is restricted by its semi-conducting 2H-phase and relatively large van der Waals interaction between adjacent layers. [7,8] The development of an earth-abundant and low-cost anode material remains a significant research challenge to the fabrication of high-performance SIBs.…”

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confidence: 99%

1T′‐ReS₂ Confined in 2D‐Honeycombed Carbon Nanosheets as New Anode Materials for High‐Performance Sodium‐Ion Batteries

Chen

Liu

et al. 2019

Advanced Energy Materials

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a viable alternative to more widespread lithium-ion batteries (LIBs). This is because of low cost and ready availability of sodium. [4][5][6] However, the larger ionic radius of Na + (1.02 vs Li + 0.76 Å) leads to sluggish electrochemical kinetics, larger volume change, and unsatisfactory reversibility. Consequently, graphite, the commercial anode material of LIBs, cannot be directly used in SIBs because of suppressed electrochemical kinetics. [7,8] The development of an earth-abundant and low-cost anode material remains a significant research challenge to the fabrication of high-performance SIBs.Recently, transition metal dichalcogenides (TMDs) have attracted attention as potential anode materials for SIBs due to their unique physical and chemical properties. [9][10][11] MoS 2 , a typical TMD, has been widely investigated because of its layered structure with large interlayerspacing (6.15 Å) that is beneficial to insertion/extraction of Na + . [12][13][14] However, conductivity and Na + diffusion is restricted by its semi-conducting 2H-phase and relatively large van der Waals interaction between adjacent layers. This results in poor electrochemical performance. 1T-MoS 2 with metallic conductivity and interlayer-expanded MoS 2 with reduced van der Waals interaction, have therefore been extensively studied. [15][16][17][18] However the fabrication of a stable 1T-MoS 2 together with extremely weak interlayer coupling via a facile and low-cost method has not been reported.Inspiringly, ReS 2 (rhenium disulfide) is a new TMD known to exhibit both distorted 1T (1T′) phase and extremely weak interlayer van der Waals interaction. [19][20][21][22][23] This makes it highly suitable for application to LIBs and SIBs. [24][25][26] The theoretical capacity of ReS 2 is 428 mAh g −1 . This value is based on the conversion reaction between one atom of ReS 2 and four of Li + or Na + . Despite these intrinsic structural advantages, a drawback is that, ReS 2 nanosheets suffer from irreversible structural change on deep charge-discharge processing. Additionally, it is reported that the direction of the largest volume expansion is along the out-of-plane. [27,28] This significantly impedes electrochemical performance of anisotropic ReS 2 anode materials in SIBs. To the best of our knowledge, only limited research has been undertaken to address this, including preparation of ReS 2 (rhenium disulfide) is a new transition-metal dichalcogenide that exhibits 1T′ phase and extremely weak interlayer van der Waals interactions. This makes it promising as an anode material for sodium-ion batteries. However, achieving both a high-rate capability and a long-life has remained a major research challenge. Here, a new composite is reported, in which both are realized for the first time. 1T′-ReS 2 is confined through strong interfacial interaction in a 2D-honeycombed carbon nanosheets that comprise an rGO inter-layer and a N-doped carbon coating-layer (rGO@ReS 2 @N-C). The strong interfacial interaction between carbon and ReS 2 increases overallconduc...

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MoS₂‐Based Nanocomposites for Electrochemical Energy Storage

Cited by 416 publications

References 177 publications

MoS2/C/C nanofiber with double-layer carbon coating for high cycling stability and rate capability in lithium-ion batteries

MoS2/C/C nanofiber with double-layer carbon coating for high cycling stability and rate capability in lithium-ion batteries

Design and Construction of Sodium Polysulfides Defense System for Room‐Temperature Na–S Battery

1T′‐ReS₂ Confined in 2D‐Honeycombed Carbon Nanosheets as New Anode Materials for High‐Performance Sodium‐Ion Batteries

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MoS2‐Based Nanocomposites for Electrochemical Energy Storage

Cited by 416 publications

References 177 publications

MoS2/C/C nanofiber with double-layer carbon coating for high cycling stability and rate capability in lithium-ion batteries

MoS2/C/C nanofiber with double-layer carbon coating for high cycling stability and rate capability in lithium-ion batteries

Design and Construction of Sodium Polysulfides Defense System for Room‐Temperature Na–S Battery

1T′‐ReS2 Confined in 2D‐Honeycombed Carbon Nanosheets as New Anode Materials for High‐Performance Sodium‐Ion Batteries

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Resources

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MoS₂‐Based Nanocomposites for Electrochemical Energy Storage

1T′‐ReS₂ Confined in 2D‐Honeycombed Carbon Nanosheets as New Anode Materials for High‐Performance Sodium‐Ion Batteries