Ionic liquid-nanoparticle hybrid electrolytes

Lü, Yingying; Moganty, Surya S.; Schaefer, Jennifer L.; Archer, Lynden A.

doi:10.1039/c2jm15345a

Cited by 139 publications

(129 citation statements)

References 45 publications

(60 reference statements)

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“…[48] Our result is especially surprising and important when confronted with earlier reports regarding Eu 3+ -b-diketonate complexes encapsulated within zeolites. [11,15,17] The mechanism responsible has been elucidated by comparing two different diketonate ligands with different pK a values and two aromatic imines, BPY and PHEN, and by applying stationary and time-resolved spectroscopy.…”

Section: Methodsmentioning

confidence: 36%

Luminescence Enhancement after Adding Stoppers to Europium(III) Nanozeolite L

Wang

et al. 2014

Angew Chem Int Ed

106

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Stopper molecules attached to nanozeolite L (NZL) boost the luminescence of confined Eu(3+)-β-diketonate complexes. The mechanism that is responsible was elucidated by comparing two diketonate ligands of different pK(a) and two aromatic imines, and by applying stationary and time resolved spectroscopy. The result is that the presence of the imidazolium based stopper is favorable to the sustainable formation of Eu(3+)-β-diketonate complexes with high coordination by decreasing the proton strength inside the channels of NZL. A consequence is that strongly luminescent transparent films can be prepared using aqueous suspension of the stopper modified composites.

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Section: Methodsmentioning

confidence: 36%

Luminescence Enhancement after Adding Stoppers to Europium(III) Nanozeolite L

Wang

et al. 2014

Angew Chem Int Ed

106

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“…1,17,18,25,26 Among these prior studies, ref. 10 and 27 are the most comprehensive, covering local to global dynamics of NIMs through analyses of dielectric spectroscopy, shear moduli, and viscosities.…”

Section: 17-19mentioning

confidence: 99%

“…28. The effects of temperature on the dynamics have been thoroughly examined, 1,10,11,[17][18][19][21][22][23]27 but only few experimental studies prepared a series of samples with modied oligomer lengths 25 or graing densities.…”

Section: 17-19mentioning

confidence: 99%

Diffusivities, viscosities, and conductivities of solvent-free ionically grafted nanoparticles

Hong

Panagiotopoulos

2013

Soft Matter

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A new class of conductive composite materials, solvent-free ionically grafted nanoparticles, were modeled by coarse-grained molecular dynamics methods. The grafted oligomeric counterions were observed to migrate between different cores, contributing to the unique properties of the materials. We investigated the dynamics by analyzing the dependence on temperature and structural parameters of the transport properties (self-diffusion coefficients, viscosities and conductivities) and counterion migration kinetics. Temperature dependence of all properties follows the Arrhenius equation, but chain length and grafting density have distinct effects on different properties. In particular, structural effects on the diffusion coefficients are described by the Rouse model and the theory of nanoparticles diffusing in polymer solutions, viscosities are strongly influenced by clustering of cores, and conductivities are dominated by the motions of oligomeric counterions. We analyzed the migration kinetics of oligomeric counterions in a manner analogous to unimer exchange between micellar aggregates. The counterion migrations follow the "double-core" mechanism and are kinetically controlled by neighboring-core collisions.

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“…15 Therefore, much research has focused on finding electrolytes that are stable against lithium metal anodes and on characterizing the state of lithium metal anodes during cycling. [16][17][18][19][20][21][22] Polymer electrolytes are a nonflammable alternative to conventional liquid and gel electrolytes, and undoubtedly improve device safety. 23,24 The most common polymer electrolyte studied is a mixture of lithium salts and poly(ethylene oxide) (PEO).…”

mentioning

confidence: 99%

Lithium Dendrite Growth in Glassy and Rubbery Nanostructured Block Copolymer Electrolytes

Schauser

Harry

Parkinson

et al. 2014

J. Electrochem. Soc.

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Enabling the use of lithium metal anodes is a critical step required to dramatically increase the energy density of rechargeable batteries. However, dendrite growth in lithium metal batteries, and a lack of fundamental understanding of the factors governing this growth, is a limiting factor preventing their adoption. Herein we present the effect of battery cycling temperature, ranging from 90 to 120 • C, on dendrite growth through a polystyrene-block-poly(ethylene oxide)-based electrolyte. This temperature range encompasses the glass transition temperature of polystyrene (107 • C). A slight increase in the cycling temperature of symmetric lithium-polymer-lithium cells from 90 to 105 • C results in a factor of five decrease in the amount of charge that can be passed before short circuit. Synchrotron hard X-ray microtomography experiments reveal a shift in dendrite location from primarily within the lithium electrode at 90 • C, to primarily within the electrolyte at 105 • C. Rheological measurements show a large change in mechanical properties over this temperature window. Time-temperature superposition was used to interpret the rheological data. Dendrite growth characteristics and cell lifetimes correlate with the temperature-dependent shift factors used for time-temperature superposition. Our work represents a step toward understanding the factors that govern lithium dendrite growth in viscoelastic electrolytes. Energy density and safety are two parameters that drive current research for improved rechargeable lithium batteries in applications such as electric vehicles and personal electronics.1 Many groups around the world are working on innovative battery chemistries, such as lithiumsulfur 2-5 and lithium-air, 3,[6][7][8] in an effort to improve battery energy density. Virtually all approaches that affect a substantial increase of the energy density of rechargeable batteries beyond that of lithiumion batteries require the use of a lithium metal anode. 4,9 Gallagher et al. show that coupling a lithium metal anode with currently available lithium cathodes results in energy densities that are three to six times larger than existing batteries used in electric vehicles. Likewise, lithium-sulfur and lithium-air chemistries rely on lithium metal anodes for improved energy density; battery energy densities obtained using a conventional graphite anode with sulfur and air cathodes are similar to those of traditional lithium ion batteries. 10The adoption of rechargeable lithium metal anode batteries has been hindered, however, by the formation of dendrites during battery cycling. 1,11,12 Upon repeated stripping and deposition, lithium metal deposits unevenly on the anode, creating protrusions that grow and eventually short the cell.13 Not only is the battery then unusable, but the flammable nature of typical liquid and gel electrolytes based on alkyl carbonates can result in catastrophic failure.1,14 Uncontrolled deposition of lithium metal can also take place in a conventional lithium-ion cell with a graphitic anode if t...

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Ionic liquid-nanoparticle hybrid electrolytes

Cited by 139 publications

References 45 publications

Luminescence Enhancement after Adding Stoppers to Europium(III) Nanozeolite L

Luminescence Enhancement after Adding Stoppers to Europium(III) Nanozeolite L

Diffusivities, viscosities, and conductivities of solvent-free ionically grafted nanoparticles

Lithium Dendrite Growth in Glassy and Rubbery Nanostructured Block Copolymer Electrolytes

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