Controlled Synthesis of Core–Shell Carbon@MoS<sub>2</sub> Nanotube Sponges as High‐Performance Battery Electrodes

Wang, Yunsong; Ma, Zhimin; Chen, Yijun; Zou, Mingchu; Yousaf, Muhammad; Yang, Yanbing; Yang, Liusi; Cao, Anyuan; Han, Ray P. S.

doi:10.1002/adma.201603812

Cited by 158 publications

(111 citation statements)

References 34 publications

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“…The decrease in the first charge capacity could be attributed to the irreversible electrolyte degradation, together with the formation of the SEI film as described previously. [11,34] For CNT/MoSe 2 /C∼6, the capacity also increases with cycle number, but this increment is small compared with CNT/MoSe 2 /C∼3 (Figure 5c). Moreover, to further investigate the effect of the carbon layer on the sodiation/desodiation of Na + , the cyclic behaviors of the CNT/ MoSe 2 and CNT/MoSe 2 /C composites with different thickness of carbon coating at a current density of 100 mA g −1 were explored (Figure 5c).…”

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confidence: 96%

“…[7,8] The ionization potential of Na + is also lower than Li + which results in a lower operating voltage and consequently, a lower energy density. [10][11][12] TMDCs such as MoS 2 are often considered a promising anode candidate for LIBs. [10][11][12] TMDCs such as MoS 2 are often considered a promising anode candidate for LIBs.…”

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confidence: 99%

“…[10][11][12] TMDCs such as MoS 2 are often considered a promising anode candidate for LIBs. [10][11][12] TMDCs such as MoS 2 are often considered a promising anode candidate for LIBs.…”

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confidence: 99%

“…[44,45] From the second cycle onward, the shape of the curves together with the cathodic and anodic peak positions of the CNT/MoSe 2 /C overlaps and this is consistent with a high degree of electrochemical reversibility and stability. [11,34] This is a very common phenomenon in TMDC-based layered structure during the charging/discharging process with the active Adv. The decrease in the first charge capacity could be attributed to the irreversible electrolyte degradation, together with the formation of the SEI film as described previously.…”

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A 3D Trilayered CNT/MoSe₂/C Heterostructure with an Expanded MoSe₂ Interlayer Spacing for an Efficient Sodium Storage

Yousaf

Wang

Chen

et al. 2019

Advanced Energy Materials

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attention because of its low cost and abundant supply of sodium. [1][2][3] However, because of its narrow interlayer spacing ≈0.34 nm, the larger size of Na + compared to Li + makes it difficult if not unsuitable for intercalation in graphite, which is commercially employed for LIB. [4][5][6] Further, the large radius of Na + in SIB electrodes produces sluggish electrochemical kinetics, provides higher diffusion barriers, and causes large volume expansion which leads to low rate capability and poor cyclic stability. [7,8] The ionization potential of Na + is also lower than Li + which results in a lower operating voltage and consequently, a lower energy density. [9] A lot of efforts in the development of advanced anode materials for SIBs have been proposed to address these issues.Recently, 2D transition metal dichalcogenides (TMDCs) have received considerable attention in electrochemical energy storage and conversion devices due to their layered structure, and the favorable electronic, chemical, and mechanical properties and stability. [10][11][12] TMDCs such as MoS 2 are often considered a promising anode candidate for LIBs. [13] However, when MoS 2 is employed in SIBs, it displays a lower capacity and a poor cyclic stability as a result of the low intrinsic conductivity and the small interlayer distance (≈0.62 nm). [14] In contrast, MoSe 2 possesses a slightly larger interlayer distance (≈0.64 nm) and better electrical conductivity due to small bandgap (≈1.1 eV). Moreover, it possesses higher theoretical capacity (≈422 mAh g −1 ) [10,15] than graphite (≈35 mAh g −1 ) [6] which makes it one of the most promising TMDC candidates for SIBs. However, the practical applications of MoSe 2 as an anode is limited by capacity fading due to the large volume expansion during long charging/discharging processes and the poor rate capability due to the low intrinsic electrical conductivity. [10] Modifying the nanostructure of the SIB electrodes can often solve some of these problems. For example, expanding the interlayer distance of MoSe 2 can lead to an improvement of the Na + storage and reducing the Na + diffusion barrier energy can enhance the reaction kinetics for the Na + intercalation/deintercalation. [16] Due to the high surface energy and weak van der Waal interactions between layers, Freestanding composite structures with embedded transition metal dichalcogenides (TMDCs) as the active material are highly attractive in the development of advanced electrodes for energy storage devices. Most 3D electrodes consist of a bilayer design involving a core-shell combination. To further enhance the gravimetric and areal capacities, a 3D trilayer design is proposed that has MoSe 2 as the TMDC sandwiched in-between an inner carbon nanotube (CNT) core and an outer carbon layer to form a CNT/ MoSe 2 /C framework. The CNT core creates interconnected pathways for the e − /Na + conduction, while the conductive inert carbon layer not only protects the corrosive environment between the electrolyte and MoSe 2 but also is fully tunable fo...

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“…[10][11][12] TMDCs such as MoS 2 are often considered a promising anode candidate for LIBs. [10][11][12] TMDCs such as MoS 2 are often considered a promising anode candidate for LIBs.…”

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confidence: 99%

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confidence: 99%

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A 3D Trilayered CNT/MoSe₂/C Heterostructure with an Expanded MoSe₂ Interlayer Spacing for an Efficient Sodium Storage

Yousaf

Wang

Chen

et al. 2019

Advanced Energy Materials

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“…For example, graphene-or carbon-nanotube-based aerogels or sponges possess many fascinating advantages, including tunable hierarchical morphology, high surface area, light weight, and good electrical conductivity. [72][73][74][75] Moreover, such aerogels can act as a matrix to support active materials, and can thus be used as flexible electrode for SIBs. [76,77] Second, searching for environmentally friendly active materials for flexible SIBs is necessary.…”

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Flexible Electrodes for Sodium‐Ion Batteries: Recent Progress and Perspectives

et al. 2017

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accessible lithium reserves are in remote or in politically sensitive areas. [5] This fact should sound the alarm for the expanded application of LIBs, because the increasing demand for LIBs could cause the price of lithium to skyrocket. It is even predicted that the world will run out of lithium supplies in the foreseeable future. [6][7][8] It is well known that sodium resources are more abundant (abundance: 23.6 × 10 3 mg kg −1 vs 20 mg kg −1 ) and vast (for example, the United States alone possesses 23 billion tons of soda ash which is a sodium-containing precursor) than lithium analog. Additionally, the trona (about $135-165 per ton), which could be used to produce sodium carbonate, has much lower cost than lithium carbonate (about $5000 per ton in 2010). [9,10] These two features endow SIBs with fascinating advantages for large-scale EES applications in the near future. Without doubt, SIBs also face big challenges: performance improvement and technological innovation. Although sodium has similar physical and chemical properties to lithium, the larger ionic radius of sodium ions compared with that of lithium ions restricts the insertion and extraction of sodium ions from the host materials commonly explored for LIBs. To address this problem, optimizing the chemical composition, tailoring the lattice structures, and regulating the morphologies of the host materials seem to be the most applicable strategies, and there have already been several excellent reviews. [11][12][13][14][15][16] As for technological innovation, the traditional fabrication processes mainly based on the slurrycasting method not only make SIBs typically rigid, thick, bulky, and heavy, but also reduce the overall volumetric/gravimetric energy density of the electrode. In the traditional slurry-casting method, the binders are insulating and electrochemically inactive, which can not only decrease the electrical conductivity, but also has a detrimental effect on the cycling stability resulting from some side effects between the electrolyte and inactive materials. In addition, the heavy weight of the binders, conductive additives and current collectors also reduces the volumetric/ gravimetric energy density of the overall electrode. Therefore, to enhance the battery performance and simplify the preparation process, the traditional slurry-casting method should be improved or even replaced; in other words, avoiding the use of binder, conductive additive, and metal current collector.In contrast, flexible electrodes are usually made from various active materials built on flexible conductive substrates without binder, conductive additive, and even metal current collector, Sodium-Ion Batteries

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CNT‐Based Aerogels and Their Applications

Li,

Lin

2024

Aerogels for Energy Saving and Storage

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Controlled Synthesis of Core–Shell Carbon@MoS₂ Nanotube Sponges as High‐Performance Battery Electrodes

Cited by 158 publications

References 34 publications

A 3D Trilayered CNT/MoSe₂/C Heterostructure with an Expanded MoSe₂ Interlayer Spacing for an Efficient Sodium Storage

A 3D Trilayered CNT/MoSe₂/C Heterostructure with an Expanded MoSe₂ Interlayer Spacing for an Efficient Sodium Storage

Flexible Electrodes for Sodium‐Ion Batteries: Recent Progress and Perspectives

CNT‐Based Aerogels and Their Applications

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Controlled Synthesis of Core–Shell Carbon@MoS2 Nanotube Sponges as High‐Performance Battery Electrodes

Cited by 158 publications

References 34 publications

A 3D Trilayered CNT/MoSe2/C Heterostructure with an Expanded MoSe2 Interlayer Spacing for an Efficient Sodium Storage

A 3D Trilayered CNT/MoSe2/C Heterostructure with an Expanded MoSe2 Interlayer Spacing for an Efficient Sodium Storage

Flexible Electrodes for Sodium‐Ion Batteries: Recent Progress and Perspectives

CNT‐Based Aerogels and Their Applications

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Product

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Controlled Synthesis of Core–Shell Carbon@MoS₂ Nanotube Sponges as High‐Performance Battery Electrodes

A 3D Trilayered CNT/MoSe₂/C Heterostructure with an Expanded MoSe₂ Interlayer Spacing for an Efficient Sodium Storage

A 3D Trilayered CNT/MoSe₂/C Heterostructure with an Expanded MoSe₂ Interlayer Spacing for an Efficient Sodium Storage