MoS2 nanorods with inner caves through synchronous encapsulation of sulfur for high performance Li–S cathodes

Yi, Yikun; Liu, Zechen; Pu, Yang; Wang, Tao; Zhao, Xuewen; Huang, Hongyang; Cheng, Yonghong; Zhang, Jinying; Li, Mingtao

doi:10.1016/j.jechem.2019.09.032

Cited by 33 publications

(9 citation statements)

References 39 publications

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“…MoS 2 nanomasks have been demonstrated to in situ grow on the surfaces of molybdenum oxides by sulfuration at 300 °C. − The inner molybdenum oxides were easily removed by annealing at high temperature . However, the crystallinity of the surface MoS 2 was significantly increased due to high-temperature annealing.…”

Section: Introductionmentioning

confidence: 99%

Low Crystalline MoS₂ Nanotubes from MoS₂ Nanomasks for Lithium Ion Battery Applications

Zhao

Liu

Xiao

et al. 2020

ACS Appl. Nano Mater.

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The properties of MoS 2 are highly dependent on its structure, which in turn is controlled by the fabrication methods. Low crystalline MoS 2 nanotubes have properties combined with the unique characteristics of nanotubes and highly active sites. However, the preparation of MoS 2 nanotubes with the desired configuration remains a big challenge. A facile method for the preparation of MoS 2 nanotubes with highly active sites is investigated by using in situ grown 3D molybdenum disulfide nanomasks. The low crystalline MoS 2 nanotubes with high specific surface areas and active sites are promising catalytic, sensing, and electrochemical materials. The highperformance lithium storage of the as-produced MoS 2 nanotubes has been demonstrated by the low crystalline MoS 2 nanotubes. A specific capacity of 1253 mAh/g has been obtained by the as-produced MoS 2 nanotubes at a current rate of 200 mAh/g after 150 cycles.

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Section: Introductionmentioning

confidence: 99%

Low Crystalline MoS₂ Nanotubes from MoS₂ Nanomasks for Lithium Ion Battery Applications

Zhao

Liu

Xiao

et al. 2020

ACS Appl. Nano Mater.

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“…To further investigate the kinetic effects of the SGPOF-320 cathode, electrochemical impedance spectroscopy (EIS) at different cycles was performed. As shown in the typical Nyquist plots and fitting lines in Figure a, the EIS spectrum before cycling is mainly divided into three regions: the intercept in the high-frequency region respecting the bulk electrolyte resistance ( R s ) in the corresponding equivalent circuit model, the diameter of the semicircle measuring the charge-transfer resistance ( R ct ) between the electrode/electrolyte interface, and the inclined line reflecting the Li + diffusion (Wo) in cathodes. , Figure a demonstrates a dramatic decrease in R ct after cycling, which is attributed to the initial wetting and activation process of the electrode. , Distinctively, an additional semicircle appears in the middle-frequency region after cycling, which could be explained by the formation of SEI on electrodes ( R SEI ). The parameters in the fitting process are all listed in Table S4, and the values of R s , R ct , and R SEI are shown as histograms in Figure b.…”

Section: Resultsmentioning

confidence: 99%

“…46,47 Figure 6a demonstrates a dramatic decrease in R ct after cycling, which is attributed to the initial wetting and activation process of the electrode. 48,49 Distinctively, an additional semicircle appears in the middlefrequency region after cycling, which could be explained by the formation of SEI on electrodes (R SEI ). The parameters in the fitting process are all listed in Table S4, and the values of R s , R ct , and R SEI are shown as histograms in Figure 6b.…”

Section: Resultsmentioning

confidence: 99%

Graphdiyne-like Porous Organic Framework as a Solid-Phase Sulfur Conversion Cathodic Host for Stable Li–S Batteries

Huang

Tian

et al. 2021

ACS Appl. Mater. Interfaces

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As a unique branch of Li−S batteries, solid-phase sulfur conversion polymer cathodes have shown superior stability with fast ion-transfer kinetics and high discharge capacities owing to the mere existence of short-chain sulfur species during charging/ discharging. However, representative compounds such as sulfurized polyacrylonitrile (SPAN) and polyaniline (SPANI) suffer from low sulfur contents and poor cycling performances under large current densities due to the sulfurization occurring only on polymers' surface. Here, a graphdiyne-like porous organic framework, denoted as GPOF, is synthesized and used as a host for enabling solid-phase sulfur conversion. Plenty of unsaturated bonds in GPOF provide sufficient reaction sites to bind sulfur chains, resulting in a high active sulfur content in the cathode. Moreover, the microporous GPOF possesses suitable cavities to accommodate the volume expansion, leading to favorable long-term cycling stability. As a result, the sulfurized GPOF cathode (SGPOF-320) displays outstanding electrochemical stability with negligible capacity decline after 250 cycles at 0.2 C with an average discharge capacity of 925 mA h g −1 . Our work applies a facile procedure to produce sulfur conversion porous polymer cathodes, which could provide a proper way for exploring more suitable cathode materials for high-performance Li−S batteries.

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“…To solve these problems, a large number of experimental studies have been conducted, and the results confirm that the porous carbon material-based sulfur hosts are more conducive to the release of high battery capacity. − Moreover, the rich pore structure can serve as physical confinement to the diffusion of polysulfide to improve the lifespan of batteries. − To further strengthen the restriction of polysulfide and accelerate its conversion, polar foreign components like heteroatoms and metallic compounds have been introduced to exert additional and strong chemical interaction. − For example, Chen et al reported the synthesis of N, B, and S tridoped carbon nanotubes by KOH activation at 850 °C/1 h and hydrothermal doping (180 °C/24 h) processes. The resultant cathode material showed a high incipient capacity of 1166 mA h g –1 and more endurable cycling stability .…”

Section: Introductionmentioning

confidence: 99%

Self-Assembled Bipolar Metals with Hollow Carbon Spheres for High-Performance Li–S Battery Cathodes

Long

Zhao

et al. 2021

ACS Appl. Energy Mater.

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The shuttling effect and sluggish redox kinetics of polysulfides are the main obstacles that restrict the practical application of lithium−sulfur (Li−S) batteries. Herein, in this work, cathode material embedded with bipolar metals Ti and Co prepared by a facile self-assembly process using hollow carbon nanospheres (HCSs), MXene nanosheets, and CoO(OH) has been reported. Due to the strong chemical adsorption and high catalytic activity introduced by the bipolar metal related active sites, the Li−S battery with the HCS@Co−MXene/S cathode shows the lowest charge transfer resistance and the best rate capability compared with HCS/S and HCS@MXene/S cathodes. Moreover, the battery delivers a high initial discharge capacity of 1309 mA h g −1 , which maintains at 570 mA h g −1 after 300 cycles at 0.5 C. Even at an elevated discharge current of 1 C, the battery retains a reversible capacity of 728 mA h g −1 over 120 cycles. Therefore, with the embedding of bipolar metals, the current Li−S battery cathode demonstrates superior cycling stability than the reference cathodes. The findings in this work exhibit a promising prospect for facile assembling of the high-performance Li−S battery cathode and the resultant device.

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MoS2 nanorods with inner caves through synchronous encapsulation of sulfur for high performance Li–S cathodes

Cited by 33 publications

References 39 publications

Low Crystalline MoS₂ Nanotubes from MoS₂ Nanomasks for Lithium Ion Battery Applications

Low Crystalline MoS₂ Nanotubes from MoS₂ Nanomasks for Lithium Ion Battery Applications

Graphdiyne-like Porous Organic Framework as a Solid-Phase Sulfur Conversion Cathodic Host for Stable Li–S Batteries

Self-Assembled Bipolar Metals with Hollow Carbon Spheres for High-Performance Li–S Battery Cathodes

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MoS2 nanorods with inner caves through synchronous encapsulation of sulfur for high performance Li–S cathodes

Cited by 33 publications

References 39 publications

Low Crystalline MoS2 Nanotubes from MoS2 Nanomasks for Lithium Ion Battery Applications

Low Crystalline MoS2 Nanotubes from MoS2 Nanomasks for Lithium Ion Battery Applications

Graphdiyne-like Porous Organic Framework as a Solid-Phase Sulfur Conversion Cathodic Host for Stable Li–S Batteries

Self-Assembled Bipolar Metals with Hollow Carbon Spheres for High-Performance Li–S Battery Cathodes

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Product

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Low Crystalline MoS₂ Nanotubes from MoS₂ Nanomasks for Lithium Ion Battery Applications

Low Crystalline MoS₂ Nanotubes from MoS₂ Nanomasks for Lithium Ion Battery Applications