Controllable morphologies and electrochemical performances of self-assembled nano-honeycomb WS2 anodes modified by graphene doping for lithium and sodium ion batteries

Song, Yaochen; Liao, Jiaxuan; Chen, Cheng; Yang, Jian; Chen, Jinchen; Gong, Feng; Wang, Sizhe; Xu, Ziqiang; Wu, Mengqiang

doi:10.1016/j.carbon.2018.07.060

Cited by 82 publications

(37 citation statements)

References 41 publications

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“…By contrast, the H‐WS 2 @NC displays a decrease frequency gap between the two peak positions and a lower intensity ratio of A 1g /

E_{2g}^{1}

, further verifying the few‐layered WS 2 nanosheets in H‐WS 2 @NC composite . The other two peaks appeared at 1352 and 1587 cm −1 are associated with the sp 3 ‐hybridized disordered carbon (D‐band) and the sp 2 ‐hybridized graphitic carbon (G‐band) in the sample of H‐WS 2 @NC, respectively . The relative intensity ratio value of the two peaks ( I D / I G ) was estimated to 1.06, demonstrating the abundant structural defects in the H‐WS 2 @NC composite owing to the formation of the N‐doping carbon matrix.…”

Section: Resultsmentioning

confidence: 93%

Self‐Assembling of Conductive Interlayer‐Expanded WS₂ Nanosheets into 3D Hollow Hierarchical Microflower Bud Hybrids for Fast and Stable Sodium Storage

Liu

et al. 2019

Adv Funct Materials

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Transition-metal dichalcogenides have emerged as promising anodes of sodium ion batteries (SIBs). Their practical SIB application calls for an easyto-handle synthetic technique capable of fabricating favorable properties with high conductivity and stable structure. Here, a solvothermal strategy is reported for bottom-up self-assembling of nanoflowers' building block, i.e., conductive interlayer-expanded 2D WS 2 nanosheets thanks to in situ interlayer modification by nitrogen-doped carbon matrix, into 3D hollow microflower bud-like hybrids (H-WS 2 @NC). The 3D nano/microhierarchical hollow structures are constructed by conductive interlayer-expanded WS 2 nanosheets' building blocks, providing abundant channels facilitating mass transport/ electrons transfer, robust protection layer to avoid the direct contact between WS 2 nanosheets and electrolyte, sufficient inner space for accommodating volume variation, and decreased ions diffusion energy barrier for accelerating electrochemical kinetics, as revealed by density functional theory calculations. As such, the 3D H-WS 2 @NC hybrids exhibit quite attractive sodium storage performance with high reversible capacity, superior rate capability, and impressively long cycling life. The 3D H-WS 2 @NC is further verified as anode of sodium-ion full cell pairing with Na 3 V 2 (PO4) 3 /rGO cathode, delivering a stable reversible capacity of 296 mAh g −1 at 0.5 A g −1 with high energy density of 128 Wh kg −1 total at a power density of 386 W kg −1 total .hierarchical hollow or porous architectures could effectively prevent the 2D subunits self-aggregation, shorten the Na + diffusion length, and alleviate the volume variation upon cycling, resulting in significantly improved cycling stability. [6] Moreover, the hollow structures would offer more accessible electroactive sites, which would promote reversible capacity. So far, most of the reported hollow structures involve impregnation of the desired materials or precursors on a structure desired template, followed by removal of the internal sacrificial template, [7] which tend to suffer from relatively high costs, tedious processes, as well as possible incompatibility between the internal template and external materials. Therefore, it is highly desirable albeit challenging to explore reliable and efficient strategies for fabrication of such hierarchical hollow architecture.Herein, we report a bottom-up template-free self-assembling solvothermal approach to fabricate 3D hierarchical hollow microflower bud hybrids constructed by nanoflowers building block of ultrathin WS 2 nanosheets embedded into nitrogendoped carbon framework (H-WS 2 @NC). Such distinctive nanomicrostructure synergistically combines the functionalities of few-layers (1-3 layers) and expanded interlayers distance (0.92 nm) of 2D ultrathin WS 2 nanosheets as well as nitrogendoped carbon incorporation a 3D hierarchical hollow porous construction. With these merits, the H-WS 2 @NC hybrids display extraordinary structural stability with high reversible capacity, outs...

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“…By contrast, the H‐WS 2 @NC displays a decrease frequency gap between the two peak positions and a lower intensity ratio of A 1g /

E_{2g}^{1}

Section: Resultsmentioning

confidence: 93%

Self‐Assembling of Conductive Interlayer‐Expanded WS₂ Nanosheets into 3D Hollow Hierarchical Microflower Bud Hybrids for Fast and Stable Sodium Storage

Liu

et al. 2019

Adv Funct Materials

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“…The key to widespread application for SIBs is to seek a suitable electrode material which is expected to simultaneously possess high theoretical capacity, low volume expansion, and excellent electric conductivity . To date, considerable efforts have been devoted to developing suitable anode materials for SIBs, such as transition metal dichalcogenides (M = Mo and W), alloying compounds (Sb, Sn, and SnO 2 ), titanates, and 2D metal carbides . It is found that most of these materials more or less tend to suffer from low reversible capacity, inferior cycling stability, or large volume expansion upon repeated Na + insertion/extraction process.…”

mentioning

confidence: 99%

Metal–Semiconductor Phase Twinned Hierarchical MoS₂ Nanowires with Expanded Interlayers for Sodium‐Ion Batteries with Ultralong Cycle Life

Shi

et al. 2019

Small

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Sodium-ion batteries (SIBs) have recently attracted great interest and been considered an ideal alternative toward lithiumion batteries due to the low cost and abundance of sodium resources on the earth. [1][2][3] However, the intrinsic larger radius (1.06 Å) of Na + than that of Li + (0.76 Å), leads to a sluggish kinetics and grievous volume expansion during Na + insertion and extraction as well as low reversible capacity and fast capacity fading for SIBs. [4,5] The key to widespread application for SIBs is to seek a suitable electrode material which is expected to simultaneously possess high theoretical capacity, low volume expansion, and excellent electric conductivity. [6] To date, considerable efforts have been devoted to developing suitable anode materials for SIBs, such as transition metal dichalcogenides (M = Mo and W), [7,8] alloying compounds (Sb, Sn, and SnO 2 ), [9][10][11] titanates, [12] and 2D metal carbides. [13] It is found that most Sodium-ion batteries (SIBs) are considered a prospective candidate for large-scale energy storage due to the merits of abundant sodium resources and low cost. However, a lack of suitable advanced anode materials has hindered further applications. Herein, metal-semiconductor mixed phase twinned hierarchical (MPTH) MoS 2 nanowires with an expanded interlayer (9.63 Å) are engineered and prepared using MoO 3 nanobelts as a selfsacrificed template in the presence of a trace amount of (NH 4 ) 6 Mo 7 O 24 ·4H 2 O as initiator. The greatly expanded interlayer spacing accelerates Na + insertion/extraction kinetics, and the metal-semiconductor mixed phase enhances electron transfer ability and stabilizes electrode structure during cycling. Benefiting from the structural merits, the MPTH MoS 2 electrode delivers high reversible capacities of 200 mAh g −1 at 0.1 A g −1 for 200 cycles and 154 mAh g −1 at 1 A g −1 for 2450 cycles in the voltage range of 0.4-3.0 V. Strikingly, the electrode maintains 6500 cycles at a current density of 2 A g −1 , corresponding to a capacity retention of 82.8% of the 2nd cycle, overwhelming the all reported MoS 2 cycling results. This study provides an alternative strategy to boost SIB cycling performance in terms of reversible capacity by virtue of interlayer expansion and structure stability.

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“…[33][34][35] From scanning electron microscopy (SEM, Figure S1a-c, Supporting Information) and transmission electron microscopy (TEM, Figure S1d-f, Supporting Information) images, it can be readily observed that rGO@ReS 2 nanosheets display a typical sandwich-like structure, in which honeycombed ReS 2 with few-layers (≈5 layers) and hierarchical meso-/macro-pores are tightly anchored on rGO nanosheets. [33][34][35] From scanning electron microscopy (SEM, Figure S1a-c, Supporting Information) and transmission electron microscopy (TEM, Figure S1d-f, Supporting Information) images, it can be readily observed that rGO@ReS 2 nanosheets display a typical sandwich-like structure, in which honeycombed ReS 2 with few-layers (≈5 layers) and hierarchical meso-/macro-pores are tightly anchored on rGO nanosheets.…”

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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...

show abstract

Controllable morphologies and electrochemical performances of self-assembled nano-honeycomb WS2 anodes modified by graphene doping for lithium and sodium ion batteries

Cited by 82 publications

References 41 publications

Self‐Assembling of Conductive Interlayer‐Expanded WS₂ Nanosheets into 3D Hollow Hierarchical Microflower Bud Hybrids for Fast and Stable Sodium Storage

Self‐Assembling of Conductive Interlayer‐Expanded WS₂ Nanosheets into 3D Hollow Hierarchical Microflower Bud Hybrids for Fast and Stable Sodium Storage

Metal–Semiconductor Phase Twinned Hierarchical MoS₂ Nanowires with Expanded Interlayers for Sodium‐Ion Batteries with Ultralong Cycle Life

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

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Controllable morphologies and electrochemical performances of self-assembled nano-honeycomb WS2 anodes modified by graphene doping for lithium and sodium ion batteries

Cited by 82 publications

References 41 publications

Self‐Assembling of Conductive Interlayer‐Expanded WS2 Nanosheets into 3D Hollow Hierarchical Microflower Bud Hybrids for Fast and Stable Sodium Storage

Self‐Assembling of Conductive Interlayer‐Expanded WS2 Nanosheets into 3D Hollow Hierarchical Microflower Bud Hybrids for Fast and Stable Sodium Storage

Metal–Semiconductor Phase Twinned Hierarchical MoS2 Nanowires with Expanded Interlayers for Sodium‐Ion Batteries with Ultralong Cycle Life

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

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Self‐Assembling of Conductive Interlayer‐Expanded WS₂ Nanosheets into 3D Hollow Hierarchical Microflower Bud Hybrids for Fast and Stable Sodium Storage

Self‐Assembling of Conductive Interlayer‐Expanded WS₂ Nanosheets into 3D Hollow Hierarchical Microflower Bud Hybrids for Fast and Stable Sodium Storage

Metal–Semiconductor Phase Twinned Hierarchical MoS₂ Nanowires with Expanded Interlayers for Sodium‐Ion Batteries with Ultralong Cycle Life

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