Effect of Graphene on Sulfur/Polyacrylonitrile Nanocomposite Cathode in High Performance Lithium/Sulfur Batteries

Zhang, Yongguang; Zhao, Yan; Bakenov, Zhumabay; Babaa, Moulay-Rachid; Konarov, Aishuak; Ding, Cong; Chen, P.

doi:10.1149/2.068308jes

Cited by 67 publications

(34 citation statements)

References 38 publications

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“…It can be seen that for both cathodes the Nyquist plots are presented by a semicircle in the high-to-medium frequency range, related to interfacial charge transfer impedance, followed by a declined line of the Warburg impedance in the low frequency part attributed to the bulk diffusion resistance of the composite cathode. 17,18 A much smaller highto-medium frequency semicircle can be seen in the S/MWNT composite electrode EIS spectra compared with that of the S/ MWNT mixture. These trends support our suggestion on the conducting property enhancement by addition of a homogeneouslydispersed MWNT suspension as precursor to prepare S/MWNT composite.…”

Section: ¹1mentioning

confidence: 98%

Synthesis of Multiwalled Carbon Nanotube Aqueous Suspension with Surfactant Sodium Dodecylbenzene Sulfonate for Lithium/Sulfur Rechargeable Batteries

et al. 2016

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Due to the hydrophobic nature of multiwalled carbon nanotube (MWNT), sodium dodecylbenzene sulfonate (SDBS) was adopted as a surfactant to synthesize a well-dispersed, homogeneous MWNT aqueous suspension. By simple stirring mixing of the resultant MWNT suspension with nano-sulfur aqueous suspension, a novel porous sulfur/ multiwalled carbon nanotube composite (S/MWNT) was synthesized. This preparation method based on the suspension mixing possesses the advantages of simplicity and low cost. Homogeneous dispersion and integration of MWNT in the composite results in a porous, highly conductive and mechanically flexible framework with enhanced electronic conductivity and ability to absorb the polysulfides into its porous structure. The cell with this S/MWNT composite cathode demonstrates a high reversibility, resulting in a stable reversible specific discharge capacity of 708 mAh g −1 after 100 cycles at 0.1 C. Furthermore, the S/MWNT composite cathode with sulfur content of 62.5 wt% exhibits a good rate capability with discharge capacities of 946, 780 and 516 mAh g −1 at 0.5, 1 and 1.5 C, respectively.

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Section: ¹1mentioning

confidence: 98%

Synthesis of Multiwalled Carbon Nanotube Aqueous Suspension with Surfactant Sodium Dodecylbenzene Sulfonate for Lithium/Sulfur Rechargeable Batteries

et al. 2016

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“…z E-mail: wonchangchoi@kist.re.kr such as polyacrylonitrile (PAN), 28,29 polypyrrole (PPy), 30 or poly(3,4-ethylenedioxythiophene) (PEDOT). 31 Yi Cui et al 32 and Wang et al 33 studied the effect of a coating of conducting polymer on a sulfur/carbon and sulfur/graphene composites, respectively, using an additional heat-treatment process to obtain carbon/sulfur materials before coating with poly(3,4-ethylenedioxythiophene)-polystyrenesulfonic acid (PEDOT:PSS).…”

Section: −30mentioning

confidence: 99%

Surface Modification of Sulfur Cathodes with PEDOT:PSS Conducting Polymer in Lithium-Sulfur Batteries

Lee

Choi

2015

J. Electrochem. Soc.

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Sulfur powder was coated with poly(3,4-ethylenedioxythiophene)-polystyrenesulfonic acid (PEDOT:PSS) using a wet mixing process in water. The modified sulfur material was investigated for use as a cathode in lithium-sulfur (Li-S) batteries. The surface modification with the conducting polymer was identified with Fourier transform infrared (FTIR) spectra, scanning electron microscopy (SEM), and high-resolution transmission electron microscopy (HR-TEM) analyses. Electrochemical evaluation revealed that surface modification with PEDOT:PSS leads to increases in initial capacity and improvements in the rate capability and cyclability of sulfur electrodes. Electrochemical impedance spectroscopy (EIS) measurements certified a decreased resistance of the PEDOT:PSS-coated sulfur electrode compared to a pure sulfur electrode, indicating that surface modification with a conducting polymer effectively enhanced the electrochemical performance of sulfur electrodes in Li-S batteries.

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“…This may partially be due to the significantly different discharge cutoff voltages used, and highlights the fact that the conditions used for the rate-capability tests have a significant impact on their results and should be unified to enable tracking the advances in Li-S-cell development. For example, some authors vary only the discharge rate, [13][14][15][16] whereas in most other cases, both charge and discharge rates are varied. Also, not always is the number of cycles at each rate specified, 10,[17][18][19][20] nor is it always constant.…”

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confidence: 99%

Pitfalls in Li–S Rate-Capability Evaluation

Schott

Novák

Trabesinger

2016

J. Electrochem. Soc.

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Rate-capability tests are widely used to highlight advances in Li-S-system development. Here we show, by studying the individual effects of a number of cycling-and electrolyte-related parameters on a simple Li-S cell, that the rate-capability results are sensitive not only to the applied current but also to the cycling prehistory of the cell. On the one hand, the performance is affected by the order in which cycling rate is changed. Slow initial rates aggravate material loss and reduce the achievable capacity. On the other hand, the results of rate-capability tests are significantly different when the rates are varied only on the charge or only on the discharge. The charge rate does not directly affect the measured capacity, whereas the discharge rate does, especially when discharge cutoff voltages are high, due to slow discharge reactions. High charge rates, however, do affect the long-term stability, which is difficult to predict from usual rate-capability tests. Our findings also provide insights into the relative reaction rates and the influence of the general cycling procedures, underlining the importance of understanding the kinetics of Li-S systems, while designing them for high performance batteries. The lithium-sulfur (Li-S) battery is one of the most promising electrochemical systems for next-generation energy-storage applications, given the abundance of sulfur, its low toxicity, and its high theoretical specific charge of 1672 mAh g sulfur -1 (often referred as well as capacity). However, the commercialization of Li-S cells is hindered by substantial challenges, including the insulating nature of sulfur and of its discharge product Li 2 S, preventing efficient activematerial utilization, and the so-called polysulfide shuttle, leading to a loss of active material and low coulombic efficiency. Considerable improvements on the electrode and cell levels were made over the past few years, alleviating these limitations and, in turn, leading to an exponentially growing interest in Li-S batteries.1-5 From the perspective of every-day battery use, having a high rate capability is very important, and therefore rate-capability tests, in which the capacity is measured while changing the cycling rate (i.e., while changing the applied current), are often employed to complete the characterization of a battery. These tests are also widely used in the characterization of Li-S systems, to quantify the improvements brought about by various enhancements to the Li-S electrodes, electrolytes, their additives, and cells. Although it is known that Li-S cells, due to their complex chemistry, are sensitive to a wide range of parameters, 6-8 the protocols used in rate-capability tests described in the literature vary significantly. A comparison of rate performances reported in publications for Li-S cells using commercially available materials 9-12 is plotted in Figure 1. Despite their similar electrode composition (∼60 wt% sulfur, ∼30 wt% carbon black, ∼10 wt% binder (PEO or PVDF)), they display significantly different rate per...

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Effect of Graphene on Sulfur/Polyacrylonitrile Nanocomposite Cathode in High Performance Lithium/Sulfur Batteries

Cited by 67 publications

References 38 publications

Synthesis of Multiwalled Carbon Nanotube Aqueous Suspension with Surfactant Sodium Dodecylbenzene Sulfonate for Lithium/Sulfur Rechargeable Batteries

Synthesis of Multiwalled Carbon Nanotube Aqueous Suspension with Surfactant Sodium Dodecylbenzene Sulfonate for Lithium/Sulfur Rechargeable Batteries

Surface Modification of Sulfur Cathodes with PEDOT:PSS Conducting Polymer in Lithium-Sulfur Batteries

Pitfalls in Li–S Rate-Capability Evaluation

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