Manganese modified zeolite silicalite-1 as polysulphide sorbent in lithium sulphur batteries

Lapornik, Vida; Tušar, Nataša Novak; Ristić, Alenka; Chellappan, Rajesh Kumar; Foix, Dominique; Dedryvère, Rémi; Gaberšček, Miran; Dominko, Robert

doi:10.1016/j.jpowsour.2014.10.184

Cited by 36 publications

(52 citation statements)

References 34 publications

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“…Figure 3i with low-loss EELS spectra and a local maximum at 22 eV is an example of an area with 5-10 graphene sheets. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 9 13 C MAS NMR spectra of our materials are presented in Figure 4. The spectra of the materials at different stages of preparation substantially differ from one another.…”

Section: Electron Microscopymentioning

confidence: 96%

“…The spectra of the materials at different stages of preparation substantially differ from one another. 13 C MAS NMR spectrum of graphene oxide (GO) exhibits a number of partly resolved signals in the chemical shift range between 0 and 200 ppm. As in previous NMR studies, 25,[43][44][45][46][47][48] To better understand the origin of the main signals in the NMR spectra of fluorinated materials, 19 F-13 C CPMAS and 19 F-13 C LG-CPMAS spectra were recorded.…”

Section: Electron Microscopymentioning

confidence: 99%

“…directly bound) nuclei. Polarization transfer to carbon nuclei that are more than one bond apart from fluorine is already substantially hampered and leads to a notable reduction of the 13 LG-HETCOR spectrum along the 19 F dimension shows that the most intense cross peak is actually accompanied by a pronounced low-frequency shoulder. This shoulder with 19 F chemical shift of about -170 ppm could be due to -C-F pairs, whose nearest neighbors in the fluorinated graphene sheets are again -C-F pairs.…”

Section: Solid State Nmrmentioning

confidence: 99%

“…sulfide Li 2 S and possible extra species resulting from side reactions can be distinguished in S 2p spectra 13. Moreover, it is possible to distinguish terminal and bridging sulfur atoms in polysulfides, and thus to obtain information about the mean length of polysulfide chains from the terminal vs. bridging sulfur intensity ratio.…”

mentioning

confidence: 99%

“…13 C MAS NMR spectra of materials at different stages of preparation. Asterisks denote spinning sidebands.…”

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confidence: 99%

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Fluorinated Reduced Graphene Oxide as an Interlayer in Li–S Batteries

et al. 2015

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We report on the synthesis of fluorinated reduced graphene oxide (F-rGO) by a direct fluorination of reduced graphene oxide (rGO) with F 2 or XeF 2 /BF 3 in anhydrous HF.Characterization performed by HAADF-STEM and NMR confirmed the formation of C-F bonds, which is also supported by the color change from graphite grey to light yellow. F-rGO has been used as an interlayer additive supported by a glass fiber separator in lithium-sulfur (Li-S) batteries in order to block the diffusion/migration of polysulfides from the porous positive electrode to the metallic lithium electrode and to prevent the redox shuttle effect.Electrochemical cycling of Li-S batteries has confirmed the beneficial role of F-rGO separators, with a more pronounced effect observed for high degrees of fluorination. X-ray photoelectron spectroscopy (XPS) studies have shown a direct effect on the amount of Li 2 S and polysulfides found on the lithium electrode, and evidenced a better reversibility of reduction/oxidation mechanisms of sulfur at the positive electrode upon discharge/charge.

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Section: Electron Microscopymentioning

confidence: 96%

Section: Electron Microscopymentioning

confidence: 99%

Section: Solid State Nmrmentioning

confidence: 99%

mentioning

confidence: 99%

“…13 C MAS NMR spectra of materials at different stages of preparation. Asterisks denote spinning sidebands.…”

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confidence: 99%

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Fluorinated Reduced Graphene Oxide as an Interlayer in Li–S Batteries

et al. 2015

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In Situ Formation of Copper‐Based Hosts Embedded within 3D N‐Doped Hierarchically Porous Carbon Networks for Ultralong Cycle Lithium–Sulfur Batteries

Luo

et al. 2018

Adv Funct Materials

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Lithium-sulfur (Li-S) batteries are promising energy storage systems due to their large theoretical energy density of 2600 Wh kg −1 and cost effectiveness. However, the severe shuttle effect of soluble lithium polysulfide intermediates (LiPSs) and sluggish redox kinetics during the cycling process cause low sulfur utilization, rapid capacity fading, and a low coulombic efficiency. Here, a 3D copper, nitrogen co-doped hierarchically porous graphitic carbon network developed through a freeze-drying method (denoted as 3D Cu@ NC-F) is prepared, and it possesses strong chemical absorption and electrocatalytic conversion activity for LiPSs as highly efficient sulfur host materials in Li-S batteries. The porous carbon network consisting of 2D cross-linked ultrathin carbon nanosheets provides void space to accommodate volumetric expansion upon lithiation, while the Cu, N-doping effect plays a critical role for the confinement of polysulfides through chemical bonding. In addition, after sulfuration of Cu@NC-F network, the in situ grown copper sulfide (Cu x S) embedded within Cu x S@NC/S-F composite catalyzes LiPSs conversion during reversible cycling, resulting in low polarization and fast redox reaction kinetics. At a current density of 0.1 C, the Cu x S@NC/S-F composites' electrode exhibits an initial capacity of 1432 mAh g −1 and maintains 1169 mAh g −1 after 120 cycles, with a coulombic efficiency of nearly 100%. development of advanced energy storage systems. Li-S batteries have been considered a new generation energy storage system because of their high theoretical energy density of 2600 Wh kg −1 and theoretical specific capacity of 1675 mAh g −1 , [1] and the merits of safe, low-cost and nonpolluting also make these batteries an exceptional storage system. To date, researchers' knowledge of boosting the energy density of Li-S batteries has resulted in an increase in energy density to 500 Wh kg −1 or more. However, a series of problems inherent in Li-S batteries remain unsolved, such as the low conductivity of sulfur (5 × 10 −30 S cm −1 at 25 °C) and its discharge products (Li 2 S/Li 2 S 2 ), [2] the solubility and shuttle effect of long-chain LiPS intermediates (Li 2 S n , 4 ≤ n ≤ 8), and large volume expansion of ≈80% cause low sulfur utilization, rapid capacity fading, and poor rate-performance and low coulombic efficiency, which still limit practical applications of Li-S batteries. [3,4] At the current stage of Li-S battery research, research has been concentrated on reducing the shuttle effect by advancing electrolyte additives, [5] optimizing cathode structures, [6] using modified separators or bifunctional interlayers, [7,8] and devising protective anode structures, [9] to enable sufficient protection and Lithium-Sulfur BatteriesThe ORCID identification number(s) for the author(s) of this article can be found under https://doi.

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Stepped Channels Integrated Lithium–Sulfur Separator via Photoinduced Multidimensional Fabrication of Metal–Organic Frameworks

et al. 2021

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Multidimensional fabrication of metal-organic frameworks (MOFs) into multilevel channel integrated devices are in high demanded for Li-S separators.S uchs eparators have advantages in pore-engineering that might fulfill requirements such as intercepting the diffusing polysulfides and improving the Li + /electrolyte transfer in Li-S batteries.H owever,most reported works focus on the roles of MOFs as ionic sieves for polysulfides while offering limited investigation on the tuning of Li + transfer across the separators.Ap hotoinduced heat-assisted processing strategy is proposed to fabricate MOFs into multidimensional devices (e.g., hollow/ Janus fibers,d ouble-or triple-layer membranes). Fort he first time,at riple-layer separator with stepped-channels has been designed and demonstrated as ap owerful separator with outstanding specific capacity (1365.0 mAh g À1 )a nd cycling performance (0.03 %fading per cycle from 100 th to 700 th cycle), which is superior to single/double-layer and commercial separators.T he findings may expedite the development of MOF-based membranes and extend the scope of MOFs in energy-storage technologies.

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Manganese modified zeolite silicalite-1 as polysulphide sorbent in lithium sulphur batteries

Cited by 36 publications

References 34 publications

Fluorinated Reduced Graphene Oxide as an Interlayer in Li–S Batteries

Fluorinated Reduced Graphene Oxide as an Interlayer in Li–S Batteries

In Situ Formation of Copper‐Based Hosts Embedded within 3D N‐Doped Hierarchically Porous Carbon Networks for Ultralong Cycle Lithium–Sulfur Batteries

Stepped Channels Integrated Lithium–Sulfur Separator via Photoinduced Multidimensional Fabrication of Metal–Organic Frameworks

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