High performance freestanding composite cathode for lithium-sulfur batteries

Mentbayeva, Almаgul; Belgibayeva, Ayaulym; Umirov, Nurzhan; Zhang, Yongguang; Taniguchi, Izumi; Kurmanbayeva, Indira; Bakenov, Zhumabay

doi:10.1016/j.electacta.2016.09.082

Cited by 50 publications

(45 citation statements)

References 33 publications

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“…In our previous works flexible S/PAN/C composite materials were demonstrated as freestanding high performance cathodes for Li-S battery. 17,18 Zeng et al reported sulfur embedded microporous carbon nanofibers as flexible freestanding cathodes for Li-S batteries. 6 Nanofibrous structure garners increasing attention in the synthesis of flexible materials for Li-ion batteries.…”

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confidence: 99%

Flexible S/DPAN/KB Nanofiber Composite as Binder-Free Cathodes for Li-S Batteries

Kalybekkyzy

Mentbayeva

Kahraman

et al. 2019

J. Electrochem. Soc.

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Sulfur/dehydrogenated polyacrylonitrile/ketjen black (S/DPAN/KB) flexible nanofiber composite was prepared by electrospinning technique and tested as a freestanding cathode for high-performance flexible lithium/sulfur batteries. S/PAN/KB was dehydrogenated at 300 • C without carbonizing and used as a cathode without any binder/current collector. The SEM observations of the obtained S/DPAN/KB nanofibers showed that the fiber diameters were in a range of 300-600 nm and the sample had a rough surface due to the presence of the S/KB particles. According to the SEM/EDS analysis sulfur is uniformly distributed within PAN fibers in both S/PAN/KB and S/DPAN/KB (heat treated) composites. The prepared binder-free S/DPAN/KB composite cathode exhibited a good electrochemical performance delivering a reversible capacity of 917 mAh g −1 after 150 cycles, exhibiting a coulombic efficiency about 100%, and demonstrating stable cyclability and good rate capability with a reversible capacity of 342 mA h g −1 at 1 C. The obtained composite cathode is highly flexible and can be used for LIB powering flexible electronic devices.

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confidence: 99%

Flexible S/DPAN/KB Nanofiber Composite as Binder-Free Cathodes for Li-S Batteries

Kalybekkyzy

Mentbayeva

Kahraman

et al. 2019

J. Electrochem. Soc.

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“…As mentioned in previous studies, the first discharge of S/PAN systems is irreversible and the reduction peak could be due to the side reactions related to solid electrolyte interface (SEI) and large polarization [53,54]. From the second cycle the system shows two reversible overlapping reduction peaks at around 1.9 and 1.6 V and a broad oxidation peak at around 2.4 V. The first small reduction peak at 1.9 V was related to formation of high order polysulfides and the second one at 1.6 V was attributed to further reduction of polysulfides into lithium sulfide [55]. Figure 5b shows the potential profiles of the S/DPAN/CNT electrodes on the cPAN CNF current collector with 1.2 mg cm −2 sulfur loading at a current density of 0.1 C. The S/DPAN/CNT electrode shows a large initial discharge capacity of 2000 mAh g −1 , which is typical for the S/DPAN system [56].…”

Section: Resultsmentioning

confidence: 99%

Electrospun 3D Structured Carbon Current Collector for Li/S Batteries

et al. 2020

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Light weight carbon nanofibers (CNF) fabricated by a simple electrospinning method and used as a 3D structured current collector for a sulfur cathode. Along with a light weight, this 3D current collector allowed us to accommodate a higher amount of sulfur composite, which led to a remarkable increase of the electrode capacity from 200 to 500 mAh per 1 g of the electrode including the mass of the current collector. Varying the electrospinning solution concentration enabled obtaining carbonized nanofibers of uniform structure and controllable diameter from several hundred nanometers to several micrometers. The electrochemical performance of the cathode deposited on carbonized PAN nanofibers at 800 °C was investigated. An initial specific capacity of 1620 mAh g−1 was achieved with a carbonized PAN nanofiber (cPAN) current collector. It exhibited stable cycling over 100 cycles maintaining a reversible capacity of 1104 mAh g−1 at the 100th cycle, while the same composite on the Al foil delivered only 872 mAh g−1. At the same time, 3D structured CNFs with a highly developed surface have a very low areal density of 0.85 mg cm−2 (thickness of ~25 µm), which is lower for almost ten times than the commercial Al current collector with the same thickness (7.33 mg cm−2).

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“…On another hand, free-standing carbon paper supported Li2S@C integrated cathode retained 52% of its initial capacity after 100 cycles at 0.1C [219]. Freestanding sulfur/dehydrogenated polyacrylonitrile/multiwalled carbon nanotube composite (S/DPAN/MWCNT) as a binder/current collector-free composite cathode exhibited a high capacity at 0.2C, 64% of it being retained at 2C rate [220]. This performance is due to the fact that PAN has high electrochemical performance due to the dipole interactions between nitrile groups -C≡N in PAN and Li + ions in the electrolytes.…”

Section: Polyacrylonitrilementioning

confidence: 99%

“…We have mentioned in a section devoted to the cathodes the remarkable properties of the 49 sulfur/dehydrogenated polyacrylonitrile/multiwalled carbon nanotube composite (S/DPAN/MWCNT) as a binder/current collector-free composite cathode [220], owing to the interactions between nitryle groups -C≡N in PAN and Li + ions in the electrolytes. In the same spirit, PAN separators were proposed.…”

Section: Multi-modified Separatorsmentioning

confidence: 99%

Advances in lithium—sulfur batteries

Zhang

Xie

Kim

et al. 2017

Materials Science and Engineering: R: Reports

111

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International audienceThis review is focused on the state-of-the-art of lithium-sulfur batteries. The great advantage of these energy storage devices in view of their theoretical specific capacity (2500 Wh kg−1, 2800 Wh L−1, assuming complete reaction to Li2S) has been the motivation for a huge amount of works. However, these batteries suffer of disadvantages that have restricted their applications such as high electrical resistance, capacity fading, self-discharge, mainly due to the so-called shuttle effect. Strategies have been developed with the recent modifications that have been proposed as a remedy to the shuttle effect, and the insulating nature of the polysulfides. All the elements of the battery are concerned and the solution, as we present herewith, is a combination of modification of the cathode, of the separator, of the electrolyte, including the choice of binder, even though few binder-free architectures have now been proposed

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High performance freestanding composite cathode for lithium-sulfur batteries

Cited by 50 publications

References 33 publications

Flexible S/DPAN/KB Nanofiber Composite as Binder-Free Cathodes for Li-S Batteries

Flexible S/DPAN/KB Nanofiber Composite as Binder-Free Cathodes for Li-S Batteries

Electrospun 3D Structured Carbon Current Collector for Li/S Batteries

Advances in lithium—sulfur batteries

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