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S. A. Hashmi - One of the best experts on this subject based on the ideXlab platform.
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Plastic crystal-incorporated Magnesium Ion conducting gel polymer electrolyte for battery applicatIon
Bulletin of Materials Science, 2018Co-Authors: Jyoti Sharma, S. A. HashmiAbstract:Studies on a novel compositIon of Magnesium Ion conducting gel polymer electrolyte (GPE), comprising a solutIon of Mg-salt, Magnesium trifluoromethanesulfonate (Mg-triflate or $$\hbox {Mg(Tf)}_{2})$$ Mg(Tf) 2 ) in a plastic crystal succinonitrile (SN), entrapped in a host polymer poly(vinylidenefluoride–hexafluoropropylene) (PVdF–HFP) was reported. Small amount of an Ionic liquid, 1-ethyl-3-methylimidazolium trifluoromethanesulfonate (EMITf) was added to stabilize the GPE compositIon. The electrolyte possesses excellent dimensIonal integrity in the form of free-standing thick film, which offers the Ionic conductivity of $$4 \times 10^{-3} \hbox { S } \hbox {cm}^{-1}$$ 4 × 10 - 3 S cm - 1 at room temperature $${\sim }26{^{\circ }}\hbox {C}$$ ∼ 26 ∘ C . The electrochemical potential window of the electrolyte, observed from the linear sweep voltammetry, is determined to be $${\sim }4.1 \hbox { V}$$ ∼ 4.1 V . The Magnesium Ion conductIon in the GPE film is confirmed from cyclic voltammetry, electrochemical impedance spectroscopy and dc polarizatIon techniques. Different structural, thermal and electrochemical studies demonstrate the promising characteristics of the polymer film, suitable as electrolyte in rechargeable Magnesium batteries. The potential of the GPE as electrolyte/separator was ascertained by fabricating a prototype Magnesium battery of the configuratIon Mg:graphite composite $$\hbox {anode}/\hbox {GPE}/\hbox {MnO}_{2}$$ anode / GPE / MnO 2 -cathode. The specific discharge capacity of $$40 \hbox { mAh g}^{-1}$$ 40 mAh g - 1 (with respect to the $$\hbox {MnO}_{2}$$ MnO 2 cathode material) was obtained at the first discharge. The cell shows charge–discharge performance for eight cycles with a substantial fading in capacity.
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Ionic liquid mediated Magnesium Ion conductIon in poly ethylene oxide based polymer electrolyte
Electrochimica Acta, 2011Co-Authors: Yogesh Kumar, S. A. Hashmi, G. P. PandeyAbstract:Abstract Magnesium Ion conductIon in poly(ethylene oxide) (PEO) based polymer electrolyte incorporated with room temperature Ionic liquid (RTIL) is reported. The electrolyte films comprise the PEO complexed with Magnesium trifluoromethanesulfonate (or Magnesium triflate) added with different amount of Ionic liquid, 1-ethyl-3-methylimidazolium trifluoromethanesulfonate (EMITf). The polymer electrolyte with ∼50 wt.% of Ionic liquid offers a maximum electrical conductivity of ∼5.6 × 10 −4 S cm −1 at room temperature (∼25 °C) with improved thermal and electrochemical stabilities. The Mg 2+ Ion conductIon in the PEO-complex is confirmed from cyclic voltammetry, impedance and transport number measurements. A significant increase in the Mg 2+ Ion transport number ( t M g 2 + ) is observed with increasing content of the Ionic liquid in PEO–Mg salt complex and the maximum value is obtained to be ∼0.45 for ∼50 wt.% of Ionic liquid. The interactIon of imidazolium catIons with ether oxygen of PEO, as evidenced from FTIR and Raman studies, play an important role in the substantial enhancement in the t M g 2 + value.
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Ionic liquid mediated Magnesium Ion conductIon in poly(ethylene oxide) based polymer electrolyte
Electrochimica Acta, 2011Co-Authors: Yogesh Kumar, S. A. Hashmi, G. P. PandeyAbstract:Magnesium Ion conductIon in poly(ethylene oxide) (PEO) based polymer electrolyte incorporated with room temperature Ionic liquid (RTIL) is reported. The electrolyte films comprise the PEO complexed with Magnesium trifluoromethanesulfonate (or Magnesium triflate) added with different amount of Ionic liquid, 1-ethyl-3-methylimidazolium trifluoromethanesulfonate (EMITf). The polymer electrolyte with ∼50 wt.% of Ionic liquid offers a maximum electrical conductivity of ∼5.6 × 10-4S cm-1at room temperature (∼25 °C) with improved thermal and electrochemical stabilities. The Mg2+Ion conductIon in the PEO-complex is confirmed from cyclic voltammetry, impedance and transport number measurements. A significant increase in the Mg2+Ion transport number (tMg2+) is observed with increasing content of the Ionic liquid in PEO-Mg salt complex and the maximum value is obtained to be ∼0.45 for ∼50 wt.% of Ionic liquid. The interactIon of imidazolium catIons with ether oxygen of PEO, as evidenced from FTIR and Raman studies, play an important role in the substantial enhancement in the tMg2+value. © 2011 Elsevier Ltd. All rights reserved.
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Magnesium Ion-conducting gel polymer electrolytes dispersed with fumed silica for rechargeable Magnesium battery applicatIon
Journal of Solid State Electrochemistry, 2011Co-Authors: G. P. Pandey, R. C. Agrawal, S. A. HashmiAbstract:Effect of fumed silica dispersIon on poly(vinylidene fluoride-co- hexafluoropropylene)-based Magnesium Ion-conducting gel polymer electrolyte has been studied using various physical and electrochemical techniques. The composite gel electrolytes are free-standing and flexible films with enough mechanical strength. The optimized compositIon with 3 wt.% filler offers a maximum Ionic conductivity of 1.1∈×∈10 -2 S∈cm -1 at 25 °C with good thermal and electrochemical stabilities. The Mg 2+ Ion conductIon in the gel nanocomposite film is confirmed from the cyclic voltammetry, impedance spectroscopy, and transport number measurements. The space-charge layers formed between filler particles and gel electrolyte are responsible for the enhancement in Ionic conductivity. The applicability of the gel nanocomposite to a rechargeable battery is examined by fabricating a prototype cell consisting of Mg [or Mg-multiwalled carbon nanotube (MWCNT) composite] and MoO 3 as negative and positive electrodes, respectively. The discharge capacity and the rechargeability of the cell have been improved when Mg metal is substituted by Mg-MWCNT composite. The discharge capacity of the optimized cell has found to be 175 mAh∈g -1 of MoO 3 for an initial ten charge-discharge cycles. © 2010 Springer-Verlag.
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Magnesium Ion conducting gel polymer electrolytes dispersed with nanosized Magnesium oxide
Journal of Power Sources, 2009Co-Authors: G. P. Pandey, R. C. Agrawal, S. A. HashmiAbstract:Abstract Experimental investigatIons are performed on novel Magnesium Ion-conducting gel polymer electrolyte nanocomposites based on poly(vinylidene fluoride-co-hexafluoropropylene) (PVdF-HFP), dispersed with nanosized Magnesium oxide (MgO) particles. The nanocomposite materials are in the form of free-standing films. Various physical and electrochemical analyses demonstrate promising characteristics of these films, suitable as electrolytes in rechargeable Magnesium batteries. The optimized material with 3 wt.% MgO offers a maximum electrical conductivity of ∼8 × 10−3 S cm−1 at room temperature (∼25 °C) with good thermal and electrochemical stabilities. The Ion/filler–polymer interactIons and possible conformatIonal changes in host polymer PVdF-HFP due to the liquid electrolyte entrapment and dispersIon of nanosized MgO are examined by Fourier transform infrared (FTIR), X-ray diffractIon (XRD) and scanning electron microscopic (SEM) methods. The Mg2+ Ion conductIon in the gel film is confirmed from the cyclic voltammetry, impedance spectroscopy and transport number measurements. The Mg2+ Ion transport number (t+) is enhanced substantially and found to have a maximum of ∼0.44 for the additIon of 10 wt.% MgO nanoparticles. The enhancement in t+ is explained on the basis of the formatIon of space-charge regIons due to the presence of MgO:Mg2+-like species, that supports Mg2+ Ion motIon.
G. P. Pandey - One of the best experts on this subject based on the ideXlab platform.
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Ionic liquid mediated Magnesium Ion conductIon in poly ethylene oxide based polymer electrolyte
Electrochimica Acta, 2011Co-Authors: Yogesh Kumar, S. A. Hashmi, G. P. PandeyAbstract:Abstract Magnesium Ion conductIon in poly(ethylene oxide) (PEO) based polymer electrolyte incorporated with room temperature Ionic liquid (RTIL) is reported. The electrolyte films comprise the PEO complexed with Magnesium trifluoromethanesulfonate (or Magnesium triflate) added with different amount of Ionic liquid, 1-ethyl-3-methylimidazolium trifluoromethanesulfonate (EMITf). The polymer electrolyte with ∼50 wt.% of Ionic liquid offers a maximum electrical conductivity of ∼5.6 × 10 −4 S cm −1 at room temperature (∼25 °C) with improved thermal and electrochemical stabilities. The Mg 2+ Ion conductIon in the PEO-complex is confirmed from cyclic voltammetry, impedance and transport number measurements. A significant increase in the Mg 2+ Ion transport number ( t M g 2 + ) is observed with increasing content of the Ionic liquid in PEO–Mg salt complex and the maximum value is obtained to be ∼0.45 for ∼50 wt.% of Ionic liquid. The interactIon of imidazolium catIons with ether oxygen of PEO, as evidenced from FTIR and Raman studies, play an important role in the substantial enhancement in the t M g 2 + value.
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Ionic liquid mediated Magnesium Ion conductIon in poly(ethylene oxide) based polymer electrolyte
Electrochimica Acta, 2011Co-Authors: Yogesh Kumar, S. A. Hashmi, G. P. PandeyAbstract:Magnesium Ion conductIon in poly(ethylene oxide) (PEO) based polymer electrolyte incorporated with room temperature Ionic liquid (RTIL) is reported. The electrolyte films comprise the PEO complexed with Magnesium trifluoromethanesulfonate (or Magnesium triflate) added with different amount of Ionic liquid, 1-ethyl-3-methylimidazolium trifluoromethanesulfonate (EMITf). The polymer electrolyte with ∼50 wt.% of Ionic liquid offers a maximum electrical conductivity of ∼5.6 × 10-4S cm-1at room temperature (∼25 °C) with improved thermal and electrochemical stabilities. The Mg2+Ion conductIon in the PEO-complex is confirmed from cyclic voltammetry, impedance and transport number measurements. A significant increase in the Mg2+Ion transport number (tMg2+) is observed with increasing content of the Ionic liquid in PEO-Mg salt complex and the maximum value is obtained to be ∼0.45 for ∼50 wt.% of Ionic liquid. The interactIon of imidazolium catIons with ether oxygen of PEO, as evidenced from FTIR and Raman studies, play an important role in the substantial enhancement in the tMg2+value. © 2011 Elsevier Ltd. All rights reserved.
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Magnesium Ion-conducting gel polymer electrolytes dispersed with fumed silica for rechargeable Magnesium battery applicatIon
Journal of Solid State Electrochemistry, 2011Co-Authors: G. P. Pandey, R. C. Agrawal, S. A. HashmiAbstract:Effect of fumed silica dispersIon on poly(vinylidene fluoride-co- hexafluoropropylene)-based Magnesium Ion-conducting gel polymer electrolyte has been studied using various physical and electrochemical techniques. The composite gel electrolytes are free-standing and flexible films with enough mechanical strength. The optimized compositIon with 3 wt.% filler offers a maximum Ionic conductivity of 1.1∈×∈10 -2 S∈cm -1 at 25 °C with good thermal and electrochemical stabilities. The Mg 2+ Ion conductIon in the gel nanocomposite film is confirmed from the cyclic voltammetry, impedance spectroscopy, and transport number measurements. The space-charge layers formed between filler particles and gel electrolyte are responsible for the enhancement in Ionic conductivity. The applicability of the gel nanocomposite to a rechargeable battery is examined by fabricating a prototype cell consisting of Mg [or Mg-multiwalled carbon nanotube (MWCNT) composite] and MoO 3 as negative and positive electrodes, respectively. The discharge capacity and the rechargeability of the cell have been improved when Mg metal is substituted by Mg-MWCNT composite. The discharge capacity of the optimized cell has found to be 175 mAh∈g -1 of MoO 3 for an initial ten charge-discharge cycles. © 2010 Springer-Verlag.
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Magnesium Ion conducting gel polymer electrolytes dispersed with nanosized Magnesium oxide
Journal of Power Sources, 2009Co-Authors: G. P. Pandey, R. C. Agrawal, S. A. HashmiAbstract:Abstract Experimental investigatIons are performed on novel Magnesium Ion-conducting gel polymer electrolyte nanocomposites based on poly(vinylidene fluoride-co-hexafluoropropylene) (PVdF-HFP), dispersed with nanosized Magnesium oxide (MgO) particles. The nanocomposite materials are in the form of free-standing films. Various physical and electrochemical analyses demonstrate promising characteristics of these films, suitable as electrolytes in rechargeable Magnesium batteries. The optimized material with 3 wt.% MgO offers a maximum electrical conductivity of ∼8 × 10−3 S cm−1 at room temperature (∼25 °C) with good thermal and electrochemical stabilities. The Ion/filler–polymer interactIons and possible conformatIonal changes in host polymer PVdF-HFP due to the liquid electrolyte entrapment and dispersIon of nanosized MgO are examined by Fourier transform infrared (FTIR), X-ray diffractIon (XRD) and scanning electron microscopic (SEM) methods. The Mg2+ Ion conductIon in the gel film is confirmed from the cyclic voltammetry, impedance spectroscopy and transport number measurements. The Mg2+ Ion transport number (t+) is enhanced substantially and found to have a maximum of ∼0.44 for the additIon of 10 wt.% MgO nanoparticles. The enhancement in t+ is explained on the basis of the formatIon of space-charge regIons due to the presence of MgO:Mg2+-like species, that supports Mg2+ Ion motIon.
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experimental investigatIons of an Ionic liquid based Magnesium Ion conducting polymer gel electrolyte
Journal of Power Sources, 2009Co-Authors: G. P. Pandey, S. A. HashmiAbstract:Abstract Studies on a novel Magnesium Ion conducting gel polymer electrolyte based on a room temperature Ionic liquid (RTIL) is reported. It comprises a Mg-salt, Mg(CF 3 SO 3 ) 2 [or Magnesium triflate, Mg(Tf) 2 ] solutIon in an Ionic liquid, 1-ethyl-3-methylimidazolium trifluoro-methanesulfonate (EMITf), immobilized with poly(vinylidene fluoride-hexafluoropropylene) (PVdF-HFP), which is a freestanding, semitransparent and flexible film with excellent mechanical strength. Physical and electrochemical analyses demonstrate promising characteristics of these films, suitable as electrolytes in rechargeable Magnesium batteries. The material offers a maximum electrical conductivity of ∼4.8 × 10 −3 S cm −1 at room temperature (20 °C) with excellent thermal and electrochemical stabilities. Possible conformatIonal changes in the polymer host PVdF-HFP due to Ionic liquid solutIon entrapment and Ion–polymer interactIon are investigated by Fourier transform infra-red (FTIR), X-ray diffractIon (XRD) and scanning electron microscopic (SEM) methods. The Mg 2+ Ion transport in the gel film is confirmed from cyclic voltammetry, impedance and transport number measurements. The Mg 2+ Ion transport number ( t + ) is ∼0.26, which indicates a substantial contributIon of triflate anIon transport along with Ionic conductIon due to the component Ions of the Ionic liquid.
Julia Maxi Kanold - One of the best experts on this subject based on the ideXlab platform.
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In vivo enrichment of Magnesium Ions modifies sea urchin spicule properties
Bioinspired biomimetic and nanobiomaterials, 2015Co-Authors: Julia Maxi Kanold, Peggy Schwendt, Johannes Baier, Frédéric Herbst, Marie-louise Lemloh, Zaklina Burghard, Joachim Bill, Frédéric Marin, Franz BrümmerAbstract:Sea urchin embryos produce an endoskeleton composed of two symmetric spicules that consist of calcite, containing approximately 5% Magnesium. The functIon of Magnesium Ions in mineral formatIon in vivo and the consequence of their incorporatIon into the mineral on mechanical properties are largely unknown. The authors investigated the in vivo effects of excess Magnesium Ion concentratIons in the medium on skeletal development of Arbacia lixula. Morphological deformatIons of pluteus larval spicules were observed after cultivatIon in Mg2+-enriched sea water. Energy dispersive X-ray spectroscopy showed that Magnesium Ions were homogeneously distributed for complete larvae and spicule cross-sectIons. Magnesium Ion content was quantified by inductively coupled plasma optical emissIon spectrometry, which revealed a considerable increased incorporatIon of Magnesium Ions into spicules of larvae from Mg2+-enriched sea water. However, no change in crystal polymorph formatIon was observed by X-ray diffractIon. Mecha...
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In vivo enrichment of Magnesium Ions modifies sea urchin spicule properties
Bioinspired, Biomimetic and Nanobiomaterials, 2012Co-Authors: Julia Maxi Kanold, Peggy Schwendt, Johannes Baier, Frédéric Herbst, Marie-louise Lemloh, Zaklina Burghard, Joachim Bill, Frédéric Marin, Franz BrümmerAbstract:Sea urchin embryos produce an endoskeleton composed of two symmetric spicules that consist of calcite, containing approximately 5% Magnesium. The functIon of Magnesium Ions in mineral formatIon in vivo and the consequence of their incorporatIon into the mineral on mechanical properties are largely unknown. The authors investigated the in vivo effects of excess Magnesium Ion concentratIons in the medium on skeletal development of Arbacia lixula. Morphological deformatIons of pluteus larval spicules were observed after cultivatIon in Mg2+-enriched sea water. Energy dispersive X-ray spectroscopy showed that Magnesium Ions were homogeneously distributed for complete larvae and spicule cross-sectIons. Magnesium Ion content was quantified by inductively coupled plasma optical emissIon spectrometry, which revealed a considerable increased incorporatIon of Magnesium Ions into spicules of larvae from Mg2+-enriched sea water. However, no change in crystal polymorph formatIon was observed by X-ray diffractIon. Mechanical properties of spicule cross-sectIons were analysed by nanoindentatIon and revealed significantly higher stiffness values for spicules from Mg2+-enriched sea water compared to the control, whereas no significant change in hardness values was obtained. This in vivo study shows that increased Magnesium Ion incorporatIon into sea urchin larval spicules modifies the mineral properties and supports this model to investigate the effect of minor Ions on biomineralisatIon.
Shinichi Hirano - One of the best experts on this subject based on the ideXlab platform.
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a novel electrolyte system without a grignard reagent for rechargeable Magnesium batteries
Chemical Communications, 2012Co-Authors: Feifei Wang, Jun Yang, Yanna Nuli, Shinichi HiranoAbstract:A new phenolate-based Magnesium Ion conducting electrolyte is prepared. The electrolyte exhibits air insensitive character and excellent electrochemical performances which make it highly promising for advanced rechargeable Mg battery systems.
Gary Rubloff - One of the best experts on this subject based on the ideXlab platform.
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activatIon of a mno2 cathode by water stimulated mg2 insertIon for a Magnesium Ion battery
Physical Chemistry Chemical Physics, 2015Co-Authors: Jaehee Song, Malakhi Noked, Jonathon Duay, Eleanor Gillette, Gary RubloffAbstract:Magnesium batteries have been considered to be one of the promising beyond lithium Ion technologies due to Magnesium's abundance, safety, and high volumetric capacity. However, very few materials show reversible performance as a cathode in Magnesium Ion systems. We present herein the best reported cycling performances of MnO2 as a Magnesium battery cathode material. We show that the previously reported poor Mg2+ insertIon/deinsertIon capacities in MnO2 can be greatly improved by synthesizing self-standing nanowires and introducing a small amount of water molecules into the electrolyte. Electrochemical and elemental analysis results revealed that the magnitude of Mg2+ insertIon into MnO2 highly depends on the ratio between water molecules and Mg2+ Ions present in the electrolyte and the highest Mg2+ insertIon capacity was observed at a ratio of 6H2O/Mg2+ in the electrolyte. We demonstrate for the first time, that MnO2 nanowire electrode can be “activated” for Mg2+ insertIon/deinsertIon by cycling in water containing electrolyte resulting in enhanced reversible Mg2+ insertIon/deinsertIon even with the absence of water molecules. The MnO2 nanowire electrode cycled in dry Mg electrolyte after activatIon in water-containing electrolyte showed an initial capacity of 120 mA h g−1 at a rate of 0.4 C and maintained 72% of its initial capacity after 100 cycles.
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ActivatIon of a MnO2 cathode by water-stimulated Mg(2+) insertIon for a Magnesium Ion battery.
Physical chemistry chemical physics : PCCP, 2015Co-Authors: Jaehee Song, Malakhi Noked, Jonathon Duay, Eleanor Gillette, Gary Rubloff, Sang Bok LeeAbstract:Magnesium batteries have been considered to be one of the promising beyond lithium Ion technologies due to Magnesium's abundance, safety, and high volumetric capacity. However, very few materials show reversible performance as a cathode in Magnesium Ion systems. We present herein the best reported cycling performances of MnO2 as a Magnesium battery cathode material. We show that the previously reported poor Mg(2+) insertIon/deinsertIon capacities in MnO2 can be greatly improved by synthesizing self-standing nanowires and introducing a small amount of water molecules into the electrolyte. Electrochemical and elemental analysis results revealed that the magnitude of Mg(2+) insertIon into MnO2 highly depends on the ratio between water molecules and Mg(2+) Ions present in the electrolyte and the highest Mg(2+) insertIon capacity was observed at a ratio of 6H2O/Mg(2+) in the electrolyte. We demonstrate for the first time, that MnO2 nanowire electrode can be "activated" for Mg(2+) insertIon/deinsertIon by cycling in water containing electrolyte resulting in enhanced reversible Mg(2+) insertIon/deinsertIon even with the absence of water molecules. The MnO2 nanowire electrode cycled in dry Mg electrolyte after activatIon in water-containing electrolyte showed an initial capacity of 120 mA h g(-1) at a rate of 0.4 C and maintained 72% of its initial capacity after 100 cycles.
