Improve Rate Capability of the Sulfur Cathode Using a Gelatin Binder

Wang, Qinqin; Wang, Weikun; Huang, Yaqin; Wang, Feng; Zhang, Hao; Zhang, Yu; Wang, Anbang; Yuan, Ke

doi:10.1149/1.3583375

Cited by 59 publications

(60 citation statements)

References 16 publications

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“…[6][7] Efforts to trap the shuttling polysulfides have mainly focused on meso/nano-carbon matrix as summarized by Liu et al, [8][9][10][11][12][13][14][15][16][17][18][19][20] formation of sulfur composites initiated by Wang et al [21][22][23] and metal oxide/sulfide hosts reviewed by Mai et al [24] Since divinyloxyhydroxyolysulphides was first developed by T.A. Skotheim et al as an alternative binder solution for Li-S batteries, [25] polymers including gelatin, [26][27][28] polyethylene oxide, [29] polyacrylic acid, [30] carboxyl methyl cellulose, [31] polyvinylpyrrolidone [32] , gum arabic binder, [33] carbonyl-β-cyclodextrin [23] and polyamidoamine dendrimer [34] were identified as promising binders to address the issue.…”

Section: Introductionmentioning

confidence: 99%

Nucleophilic substitution between polysulfides and binders unexpectedly stabilizing lithium sulfur battery

et al. 2017

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Polysulfide shuttling has been the primary cause of failure in lithium-sulfur (Li-S) battery cycling. Here, we demonstrate an uncleophilic substitution reaction between polysulfides and binder functional groups can unexpectedly immobilizes the polysulfides. The substitution reaction is verified by UV-visible spectra and X-ray photoelectron spectra. The immobilization of polysulfide is in situ monitored by synchrotron based sulfur K-edge X-ray absorption spectra. The resulting electrodes exhibite initial capacity up to 20.4 mAh/cm 2 , corresponding to 1199.1 mAh/g based on a micron-sulfur mass loading of 17.0 mg/cm 2 . The micron size sulfur transformed into nano layer coating on the cathode binder during cycling.Directly usage of nano-size sulfur promotes higher capacity of 33.7 mAh/cm 2 , which is the highest areal capacity reported in Li-S battery. This enhance performance is due to the reduced shuttle effect by covalently binding of the polysulfide with the polymer binder.2

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Section: Introductionmentioning

confidence: 99%

Nucleophilic substitution between polysulfides and binders unexpectedly stabilizing lithium sulfur battery

et al. 2017

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“…Exciting progress has recently been made in trapping polysulphide species in high surface area carbon 10 , oxide and polymer [11][12][13] , in hollow structures [14][15][16] and with binders [17][18][19] . The pioneering work by the Nazar et al 1 on mesoporous carbon particles to encapsulate sulphur demonstrated the relatively high capacity of about 1,000 mAh g À 1 for 20 cycles 10 .…”

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Improving lithium–sulphur batteries through spatial control of sulphur species deposition on a hybrid electrode surface

et al. 2014

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Lithium-sulphur batteries are attractive owing to their high theoretical energy density and reasonable kinetics. Despite the success of trapping soluble polysulphides in a matrix with high surface area, spatial control of solid-state sulphur and lithium sulphide species deposition as a critical aspect has not been demonstrated. Herein, we show a clear visual evidence that these solid species deposit preferentially onto tin-doped indium oxide instead of carbon during electrochemical charge/discharge of soluble polysuphides. To incorporate this concept of spatial control into more practical battery electrodes, we further prepare carbon nanofibers with tin-doped indium oxide nanoparticles decorating the surface as hybrid three-dimensional electrodes to maximize the number of deposition sites. With 12.5 ml of 5 M Li 2 S 8 as the catholyte and a rate of C/5, we can reach the theoretical limit of Li 2 S 8 capacity B1,470 mAh g À 1 (sulphur weight) under the loading of hybrid electrode only at 4.3 mg cm À 2 .

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“…Zheng et al [9] Wang et al [10] Lacey et al [11] Peng et al [12] 0.0 0.2 0.4 0.6 0.8 1.0 C-rate Figure 1. Reported capacities for simple sulfur-based electrodes at different specific currents (cycling rates).…”

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confidence: 99%

“…Reported capacities for simple sulfur-based electrodes at different specific currents (cycling rates). [9][10][11][12] do affect the extent to which the polysulfide shuttle impacts on the performance of the cell. 8,9,24,25 The aim of the present study is to assess the sensitivity and reliability of rate-capability tests for Li-S systems.…”

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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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Improve Rate Capability of the Sulfur Cathode Using a Gelatin Binder

Cited by 59 publications

References 16 publications

Nucleophilic substitution between polysulfides and binders unexpectedly stabilizing lithium sulfur battery

Nucleophilic substitution between polysulfides and binders unexpectedly stabilizing lithium sulfur battery

Improving lithium–sulphur batteries through spatial control of sulphur species deposition on a hybrid electrode surface

Pitfalls in Li–S Rate-Capability Evaluation

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