Preparation of hierarchical C@MoS<sub>2</sub>@C sandwiched hollow spheres for lithium ion batteries

Li, Zhenyou; Ottmann, Alexander; Zhang, Ting; Sun, Qing; Meyer, Hans‐Peter; Vaynzof, Yana; Xiang, Jinjuan; Klingeler, R.

doi:10.1039/c6ta10439h

Cited by 79 publications

(30 citation statements)

References 44 publications

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“…Meanwhile, the Coulombic efficiency increased to nearly 100% from the second cycle in Figure b, and the discharge capacity was 931 mAh g −1 after 100 cycles at a current density of 0.1 A g −1 . The capacities are superior to many MoS 2 ‐based electrodes such as MoS 2 /PANI (801 mAh g −1 at 100 mA g −1 after 50 cycles), C@MoS 2 @C hollow spheres (856mAh g −1 at 67 mA g −1 after 100 cycles), MoS 2 /3D graphene (877 mAh g −1 at 100 mA g −1 after 50 cycles) . The outstanding performance was attributed to the composite construction of G/MoS 2 , which prevented the restack of MoS 2 nanosheets and promoted the transportation of lithium ion and electron in charging and discharging processes.…”

Section: Resultsmentioning

confidence: 98%

Graphene‐Assisted Exfoliation of Molybdenum Disulfide to Fabricate 2D Heterostructure for Enhancing Lithium Storage

Wang

Zhao

Sun

et al. 2017

Adv Materials Inter

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Graphene–molybdenum sulfide composite materials are attracting considerable interest as a promising candidate of anode for lithium‐ion batteries because of their excellent electrical properties. However, few studies have been conducted on the lithium‐storage mechanism and process of dynamics of these materials. In this work, the lithium‐storage mechanism of these materials is examined by structural characterization and kinetic analysis. Structural characterization results show that the prepared G/MoS2 is a heterostructure and contains CS bonds after treatment with a novel layered graphene oxide‐assisted ultrasonic method. The existence of CS bond benefits the transport of lithium ion and electrons and enhances the electrochemical properties of G/MoS2 electrode. Kinetic analysis further reveals that the lithium‐ion diffusion effect plays a major role in charge and discharge processes. This synthesis method and analysis strategy may also apply to other composite materials for high‐performance lithium‐ion storage.

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Section: Resultsmentioning

confidence: 98%

Graphene‐Assisted Exfoliation of Molybdenum Disulfide to Fabricate 2D Heterostructure for Enhancing Lithium Storage

Wang

Zhao

Sun

et al. 2017

Adv Materials Inter

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“…Although the volume change of MoS 2 is significantly less than that in silicon-based electrodes, the theoretical 103% volume expansion via the conversion reaction of MoS 2 to Li 2 S and molybdenum will still lead to depressed cycling stability and rate performance [18][19][20][21]. The intrinsically limited conductivity, restacking of MoS 2 nanosheets, side reactions between Li 2 S and electrolyte, and polysulfide dissolution during cycling can further aggravate the degradation of electrochemical performance [22][23][24].…”

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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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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“…Another peak at 0.58 V is related to the conversion of Li x MoS 2 into metal Mo and Li 2 S. In the subsequent cycles, the two peaks are not observed and the CV curves appear three new peaks located at 1.87 V, 1.06 V and 0.3 V, respectively. These three peaks are attributed to the following reaction equation (1), (2) and (3), respectively ,

true 2 Li^{+} + normalS + 2 e^{-} \to Li_{2} normalS

true MoS_{2} + xLi^{+} + xe^{-} \to Li_{x} MoS_{2}

true Li_{x} MoS_{2} + (4 - x) Li^{+} + (4 - x) normale^{-} \to Mo + 2 Li_{2} normalS

…”

Section: Resultsmentioning

confidence: 99%

Synthesis of MoS₂ and Graphene Composites as the Anode Materials for Li–Ion Batteries

et al. 2018

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The MoS2 and N‐doped graphene (MoS2/NG) composites are fabricated by an ethylenediamine‐assisted hydrothermal method for the anode materials of lithium‐ion batteries. The effects of hydrothermal systems with different amount ethylenediamine on the morphology of the MoS2 in the prepared composites are investigated. The microstructure and morphology of the as‐obtained composites are characterized by SEM, TEM and XRD methods. The analytical result reveals that the ultrathin few‐layered MoS2 nanosheets are tightly anchored on the graphene in the MoS2/NG composites. Given the different nanostructures of the as‐obtained composites, the possible formation mechanism is discussed and the electrochemical properties are studied. The MoS2/NG composites prepared with optimized amount of ethylenediamine modifier exhibit improved electrochemical performances, i. e. the enhanced cycling stability with reversible capacity of 816.6 mA h g−1 at 200 mA g−1 after 120 cycles and remarkable high‐rate capacity of 683.8 mA h g−1 at 2000 mA g−1. Therefore, the MoS2/graphene composites have great potential being an electrode material for lithium‐ion batteries (LIBs).

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Preparation of hierarchical C@MoS₂@C sandwiched hollow spheres for lithium ion batteries

Cited by 79 publications

References 44 publications

Graphene‐Assisted Exfoliation of Molybdenum Disulfide to Fabricate 2D Heterostructure for Enhancing Lithium Storage

Graphene‐Assisted Exfoliation of Molybdenum Disulfide to Fabricate 2D Heterostructure for Enhancing Lithium Storage

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

Synthesis of MoS₂ and Graphene Composites as the Anode Materials for Li–Ion Batteries

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Preparation of hierarchical C@MoS2@C sandwiched hollow spheres for lithium ion batteries

Cited by 79 publications

References 44 publications

Graphene‐Assisted Exfoliation of Molybdenum Disulfide to Fabricate 2D Heterostructure for Enhancing Lithium Storage

Graphene‐Assisted Exfoliation of Molybdenum Disulfide to Fabricate 2D Heterostructure for Enhancing Lithium Storage

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

Synthesis of MoS2 and Graphene Composites as the Anode Materials for Li–Ion Batteries

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Preparation of hierarchical C@MoS₂@C sandwiched hollow spheres for lithium ion batteries

Synthesis of MoS₂ and Graphene Composites as the Anode Materials for Li–Ion Batteries