A modified free-volume model: correlation of ion-conduction in strongly associating polymeric materials

Ramesh, Narayan

doi:10.1016/s0376-7388(01)00439-2

Cited by 15 publications

(9 citation statements)

References 41 publications

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“…This result shows consistency with the theory established by M. Armand in 1978 [3] and other earlier reports on conductivity property of various polymer electrolytes [14,30,[33][34][35][36]. The observed increase in conductivity could be due to increased segmental motion of the polymer chains and mobility of ions, which may be explained with the help of the free volume theory in polymers [37,38]. When the temperature and hence the thermal energy increases, the polymer electrolyte gains higher free volume.…”

Section: Conductivity Studiessupporting

confidence: 92%

Ionic conductivity and transport properties of poly(vinylidene fluoride-co-hexafluoropropylene)-based solid polymer electrolytes

Abreha

Subrahmanyam²,

Kumar

2016

Chemical Physics Letters

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Section: Conductivity Studiessupporting

confidence: 92%

Ionic conductivity and transport properties of poly(vinylidene fluoride-co-hexafluoropropylene)-based solid polymer electrolytes

Abreha

Subrahmanyam²,

Kumar

2016

Chemical Physics Letters

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“…A mechanism which may contribute to the development of such a dynamic contrast between counterions located close to the dendrimer periphery is the so-called "hopping" mechanism which has been identified in biological systems 59 in polymer electrolyte solutions 60,61 and in disordered ionic materials. 62 This process involves a hopping motion over few ionic diameters 26 and has been suggested to play a key role in ionic transport and thus in the systems' conductivity.…”

Section: Discussionmentioning

confidence: 99%

“…62 This process involves a hopping motion over few ionic diameters 26 and has been suggested to play a key role in ionic transport and thus in the systems' conductivity. 35,59,60,63 Since the population balance between strongly and weakly bound counterions is, in fact, dynamic in nature, 30,31 it is straightforward to assume that this mechanism works toward promoting the exchange between the two populations. A typical method for the identification of such a process is through the detection of a dynamic contrast between the examined particles; such a contrast can be inferred from the development of different peaks in their self-Van Hove function, 53,54 as is the case in our systems ͑Figs.…”

Section: Discussionmentioning

confidence: 99%

Dynamics of counterions in dendrimer polyelectrolyte solutions

Karatasos

Krystallis

2009

The Journal of Chemical Physics

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Molecular dynamics simulations were employed in models of peripherally charged dendrimers in solutions of explicit solvent and monovalent counterions in order to explore aspects of the dynamic behavior of counterions. The present study explores the effects of varying strength of electrostatic interactions for models of two dendrimer generations, in explicit solvent solutions below the dendrimer overlap concentration. Counterion diffusional motion as well as residence lifetimes of pairs formed by charged dendrimer beads and condensed counterions is monitored in the different electrostatic regimes. Spatiotemporal characteristics of self- and collective counterion motion are explored by means of space-time Van Hove correlation functions. A characteristic scaling law is found to describe the counterion diffusion coefficient as a function of Bjerrum length in the strong electrostatic regime, independent of the size of the dendrimer molecules at the examined volume fractions. The change noted in the diffusional motion of counterions in the range of strong Coulombic interactions is also reflected to their relevant residence times. Development of dynamic heterogeneities in counterion self-motion is observed during the gradual increase in the strength of electrostatic interactions, characterized by the emergence of distinct counterion populations in terms of their mobility. The time scale for the development of such a mobility contrast in the self-motion of the counterions can be correlated with that describing their collective motion as well. The latter increases with Bjerrum length but remains shorter compared to the time scale at which free diffusional motion sets in. Findings from the present study provide further insight on the mechanisms pertinent to ion migration in macroion dispersions and may serve as a basis for the interpretation of ionic motion in a broader range of polyelectrolyte systems.

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“…In the reported solid electrolytes, the free space originated from the vibration of electrolyte molecule usually restricts the movement of ions greatly. 31 In some electrolytes, ions can only transfer through holes, but some holes are not fully interconnected. 32 The bicontinuous twophase structure of RCN consists of water-rich phases and cellulose-rich phases.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…In the reported solid electrolyte, the free space originated from the vibration of electrolyte molecule often seriously restricts the movement of ions. 31 Therefore, the ionic conductivity of solid polymer electrolyte is usually no more than 1 × 10 −4 S cm −1 . 32 By contrast, in our system, all ionic conductivity of SCs are greater than 1 × 10 −3 S cm −1 .…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Highly Efficient and Stable Cellulose-Based Ion Gel Polymer Electrolyte for Solid-State Supercapacitors

Zhu

et al. 2019

ACS Appl. Energy Mater.

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To solve the current situation of low efficiency and instability of SCs, herein, the regenerated cellulose nanoparticles are applied on the electrolyte for the first time and a kind of solidstate SC with high performance is synthesized in a facile way. The electrolyte is prepared taking copolymer poly(vinyl alcohol) (PVA) as the polymer matrix, 1-butyl-3-methylimidazolium trifluoromethansulfonate (BmimCF 3 SO 3 ) as the supporting electrolyte, graphene oxide as the ionic conducting promoter, and regenerated cellulose nanoparticles as the regulator. This doped ion gel significantly improves the charge-transfer resistance, because the homogeneously distributed regenerated cellulose nanoparticles make the ion transmission more orderly and stable and then reduce charge transfer resistance greatly. A model of the transmission of ions in the novel electrolyte is proposed. The cellulose-based gel electrolyte enables the SC to show good capacity retention of about 80%, and its charge/ discharge efficiency maintains at 98% after 10,000 cycles. Those satisfactory performances are due to the high ionic conductivity, excellent compatibility with carbon electrodes and long-term stability of the doped ion gel. Attributed to the simple procedure and its components, the gel electrolyte is highly scalable, cost-effective, safe, and nontoxic as well as has application potential in various energy storage and delivery systems.

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A modified free-volume model: correlation of ion-conduction in strongly associating polymeric materials

Cited by 15 publications

References 41 publications

Ionic conductivity and transport properties of poly(vinylidene fluoride-co-hexafluoropropylene)-based solid polymer electrolytes

Ionic conductivity and transport properties of poly(vinylidene fluoride-co-hexafluoropropylene)-based solid polymer electrolytes

Dynamics of counterions in dendrimer polyelectrolyte solutions

Highly Efficient and Stable Cellulose-Based Ion Gel Polymer Electrolyte for Solid-State Supercapacitors

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