Using pressure, temperature and frequency as variables to study the dynamics of mobile ions in materials with disordered structures

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Section: Pressure-dependent Ion Dynamics In a Glasssupporting

confidence: 89%

Section: Localised Ionic Motion and Second Universality 41 Separatinmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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First and Second Universalities: Expeditions Towards and Beyond

Funke¹,

Banhatti

Laughman³

et al. 2010

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“…For example, a quantitative description of conductivity spectra has been formulated considering correlated back jumps [20,21]. This approach is used for the characterization of possible conduction mechanisms [22,23]. However, beyond phenomenological models no first-principles theory of ion conduction is available.…”

Section: Introductionmentioning

confidence: 99%

Theoretical Description of Ion Conduction in Disordered Systems: From Linear to Nonlinear Response

Röthel

Friedrich

Lühning

et al. 2010

The modelling of the ion conduction in disordered systems is analysed from two different perspectives. First, molecular dynamics simulations are employed to extract some basic properties of the hopping dynamics. It turns out that the dynamical processes can be described to a very good approximation as vacancy hopping processes. Second, the information content of nonlinear conductivity experiments, using high electric fields, is elucidated. For this purpose the single-particle dynamics on 1D and 2D model energy landscapes is elucidated numerically and partly analytically. The approaches encompass discrete as well as continuous energy landscapes, yielding complementary results about the dynamics. The impact for the interpretation of experimental data is discussed.

“…A consistent theoretical model to calculate these three parameters and to interpret them in terms of a transport mechanism is not available. However, a quantitative interpretation of the temperature dependent ion conductivity of polymers has been developed within the MIGRATION concept of Funke and coworkers [57,[70][71][72]. It offers an excellent access to a quantitative description of the microscopic dynamics of ion movement in glasses and polymers.…”

Section: Mechanistic Considerations and Limitations Of The Ionic Mobimentioning

confidence: 99%

Salt-in-Polymer Electrolytes for Lithium Ion Batteries Based on Organo-Functionalized Polyphosphazenes and Polysiloxanes

Burjanadze

Karatas

Kaskhedikar

et al. 2010

An overview is given on polymer electrolytes based on organo-functionalized polyphosphazenes and polysiloxanes. Chemical and electrochemical properties are discussed with respect to the synthesis, the choice of side groups and the goal of obtaining membranes and thin films that combine high ionic conductivity and mechanical stability. Electrochemical stability, concentration polarization and the role of transference numbers are discussed with respect to possible applications in lithium batteries. It is shown that the ionic conductivities of salt-in-polymer membranes without additives and plasticizers are limited to maximum conductivities around 10 −4 S/cm. Nevertheless, a straightforward strategy based on additives can increase the conductivities to at least 10 −3 S/cm and maybe further. In this context, the future role of polymers for safe, alternative electrolytes in lithium batteries will benefit from concepts based on polymeric gels, composites and hybrid materials. Presently developed polymer electrolytes with oligoether sidechains are electrochemically stable in the potential range 0-4.5 V (vs. Li/Li + reference).