scholarly journals 3-D Edge-Oriented Electrocatalytic NiCo2S4 Nanoflakes on Vertical Graphene for Li-S Batteries

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Wenyue Li ◽  
Shiqi Li ◽  
Ayrton A. Bernussi ◽  
Zhaoyang Fan
Keyword(s):  
Active Sites ◽  
High Performance ◽  
Carbon Nanofiber ◽  
Coulombic Efficiency ◽  
Small Mass ◽  
Performance Measurements ◽  
Free Standing ◽  
Shuttle Effect ◽  
Catalytic Function ◽  
Polysulfide Shuttle

Polysulfide shuttle effect, causing extremely low Coulombic efficiency and cycling stability, is one of the toughest challenges hindering the development of practical lithium sulfur batteries (LSBs). Introducing catalytic nanostructures to stabilize the otherwise soluble polysulfides and promote their conversion to solids has been proved to be an effective strategy in attacking this problem, but the heavy mass of catalysts often results in a low specific energy of the whole electrode. Herein, by designing and synthesizing a free-standing edge-oriented NiCo2S4/vertical graphene functionalized carbon nanofiber (NCS/EOG/CNF) thin film as a catalytic overlayer incorporated in the sulfur cathode, the polysulfide shuttle effect is largely alleviated, revealed by the enhanced electrochemical performance measurements and the catalytic function demonstration. Different from other reports, the NiCo2S4 nanosheets synthesized here have a 3-D edge-oriented structure with fully exposed edges and easily accessible in-plane surfaces, thus providing a high density of active sites even with a small mass. The EOG/CNF scaffold further renders the high conductivity in the catalytic structure. Combined, this novel structure, with high sulfur loading and high sulfur fraction, leads to high-performance sulfur cathodes toward a practical LSB technology.

scholarly journals Porous Carbon Architecture Assembled by Cross-Linked Carbon Leaves with Implanted Atomic Cobalt for High-Performance Li–S Batteries

2021 ◽  
Vol 13 (1) ◽  
Author(s):  
Ruirui Wang ◽  
Renbing Wu ◽  
Chaofan Ding ◽  
Ziliang Chen ◽  
Hongbin Xu ◽  
...  
Keyword(s):  
Active Sites ◽  
High Performance ◽  
Specific Capacity ◽  
Three Dimension ◽  
Zeolitic Imidazolate Framework ◽  
Shuttle Effect ◽  
Promising Solution ◽  
Fading Rate ◽  
Kinetics Of ◽  
Sulfur Cathodes

AbstractThe practical application of lithium–sulfur batteries is severely hampered by the poor conductivity, polysulfide shuttle effect and sluggish reaction kinetics of sulfur cathodes. Herein, a hierarchically porous three-dimension (3D) carbon architecture assembled by cross-linked carbon leaves with implanted atomic Co–N4 has been delicately developed as an advanced sulfur host through a SiO2-mediated zeolitic imidazolate framework-L (ZIF-L) strategy. The unique 3D architectures not only provide a highly conductive network for fast electron transfer and buffer the volume change upon lithiation–delithiation process but also endow rich interface with full exposure of Co–N4 active sites to boost the lithium polysulfides adsorption and conversion. Owing to the accelerated kinetics and suppressed shuttle effect, the as-prepared sulfur cathode exhibits a superior electrochemical performance with a high reversible specific capacity of 695 mAh g−1 at 5 C and a low capacity fading rate of 0.053% per cycle over 500 cycles at 1 C. This work may provide a promising solution for the design of an advanced sulfur-based cathode toward high-performance Li–S batteries.

Flexible and free-standing carbon nanofiber matt derived from electrospun polyimide as an effective interlayer for high-performance lithium–sulfur batteries

2019 ◽  
Vol 54 (12) ◽  
pp. 9075-9087 ◽  
Author(s):  
Tejassvi Pakki ◽  
E. Hari Mohan ◽  
Neha Y. Hebalkar ◽  
Jyothirmayi Adduru ◽  
Sarada V. Bulusu ◽  
...  
Keyword(s):  
High Performance ◽  
Carbon Nanofiber ◽  
Free Standing ◽  
Lithium Sulfur Batteries ◽  
Lithium Sulfur

Nitrogen-enriched electrospun porous carbon nanofiber networks as high-performance free-standing electrode materials

2014 ◽  
Vol 2 (46) ◽  
pp. 19678-19684 ◽  
Author(s):  
Ding Nan ◽  
Zheng-Hong Huang ◽  
Ruitao Lv ◽  
Lu Yang ◽  
Jian-Gan Wang ◽  
...  
Keyword(s):  
Anode Material ◽  
Porous Carbon ◽  
High Performance ◽  
Electrode Materials ◽  
Carbon Nanofiber ◽  
Rate Capability ◽  
Free Standing ◽  
Porous Carbon Nanofiber ◽  
Good Rate Capability

Nitrogen-enriched electrospun carbon nanofiber networks were prepared to use as a free-standing LIB anode material with ultrahigh capacity and good rate capability.

Free-standing polyaniline–porous carbon nanofiber electrodes for symmetric and asymmetric supercapacitors

RSC Advances ◽  
2014 ◽  
Vol 4 (103) ◽  
pp. 59427-59435 ◽  
Author(s):  
Mahmut Dirican ◽  
Meltem Yanilmaz ◽  
Xiangwu Zhang
Keyword(s):  
Porous Carbon ◽  
High Performance ◽  
Carbon Nanofiber ◽  
Free Standing ◽  
Asymmetric Supercapacitors ◽  
Porous Carbon Nanofiber

Polyaniline–porous carbon nanofiber composites were introduced for use as flexible, binder-less electrodes for high-performance supercapacitors.

Macroporous carbon nanofiber decorated with platinum nanorods as free-standing cathodes for high-performance Li–O2 batteries

Carbon ◽  
2019 ◽  
Vol 154 ◽  
pp. 448-456 ◽  
Author(s):  
Hieu Trung Bui ◽  
Do Youb Kim ◽  
Young Yun Kim ◽  
Ngan Hong Le ◽  
Dong Wook Kim ◽  
...  
Keyword(s):  
High Performance ◽  
Carbon Nanofiber ◽  
Free Standing ◽  
Macroporous Carbon

Free-Standing NiS2 Electrode as High-Rate Anode Material for Sodium-Ion Batteries

2020 ◽  
Vol 20 (11) ◽  
pp. 7119-7123
Author(s):  
Milan K. Sadan ◽  
Hui Hun Kim ◽  
Changhyeon Kim ◽  
Gyu-Bong Cho ◽  
N. S. Reddy ◽  
...  
Keyword(s):  
Current Density ◽  
Carbon Nanofiber ◽  
High Current Density ◽  
Coulombic Efficiency ◽  
Sodium Ion ◽  
High Rate ◽  
Sodium Ion Batteries ◽  
Rate Performance ◽  
Free Standing ◽  
Transfer Resistance

Owing to the speculated price hike and scarcity of lithium resources, sodium-ion batteries are attracting significant research interest these days. However, sodium-ion battery anodes do not deliver good electrochemical performance, particularly rate performance. Herein, we report the facile electrospinning synthesis of a free-standing nickel disulfide (NiS2) embedded on carbon nanofiber. This electrode did not require a conducting agent, current collector, and binder, and typically delivered high capacity and rate performance. The electrode delivered a high initial capacity of 603 mAh g−1 at the current density of 500 mA g−1. Moreover, the electrode delivered the capacity of 271 mAh g−1 at the high current density of 15 A g−1. The excellent rate performance and high coulombic efficiency of the electrode were attributed to its low charge transfer resistance and unique structure.

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