Second Phase Effects on the Conductivity of Non‐Aqueous Salt Solutions: “Soggy Sand Electrolytes”

Bhattacharyya, Aninda J.; Maier, Joachim

doi:10.1002/adma.200306210

Cited by 223 publications

(207 citation statements)

References 20 publications

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“…31 Here, it is worthwhile mentioning "Soggy Sand Electrolytes". 32,33 The total conductivities are highly increased by virtue of the very high conductivities at the edge of the space charge profiles. This work is of significance owing to evidence of heterogeneous doping mechanism as well as improvement of mechanical behaviour for the polymer electrolytes in the field of solid-state lithium batteries.…”

Section: Space Charge Layer Effects On Conductivities At Various Bounmentioning

confidence: 99%

Space Charge Layer Effect in Solid State Ion Conductors and Lithium Batteries: Principle and Perspective

Chen

Guo

2016

ACSi

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This paper is dedicated to Prof. Dr. Janko Jamnik, who was my enthusiastic and helpful MPI colleague as well as with high academic level and reputation in science community. AbstractThe space charge layer (SCL) effects were initially developed to explain the anomalous conductivity enhancement in composite ionic conductors. They were further extended to qualitatively as well as quantitatively understand the interfacial phenomena in many other ionic-conducting systems. Especially in nanometre-scale systems, the SCL effects could be used to manipulate the conductivity and construct artificial conductors. Recently, existence of such effects either at the electrolyte/cathode interface or at the interfaces inside the composite electrode in all solid state lithium batteries (ASSLB) has attracted attention. Therefore, in this article, the principle of SCL on basis of defect chemistry is first presented. The SCL effects on the carrier transport and storage in typical conducting systems are reviewed. For ASSLB, the relevant effects reported so far are also reviewed. Finally, the perspective of interface engineer related to SCL in ASSLB is addressed.

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Section: Space Charge Layer Effects On Conductivities At Various Bounmentioning

confidence: 99%

Space Charge Layer Effect in Solid State Ion Conductors and Lithium Batteries: Principle and Perspective

Chen

Guo

2016

ACSi

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“…Several models to explain such an interaction, all of which relying on electrostatic interactions between the surface of the particles and the various anionic or ionic species present in the polymer electrolyte have been put forward. In the Maier model [36][37][38][39][40][41], these adsorptive or desorptive interactions entail an increase of one ion species in the space charge layer in the interfacial regions of electrolyte and particle [41,42]. The electrostatic interactions between the ionic species and the particle surface may as well be viewed as Lewis acid/base interactions [43][44][45][46][47][48].…”

Section: Nanocompositesmentioning

confidence: 99%

Local Li Cation Coordination and Dynamics in Novel Solid Electrolytes

Wüllen¹,

Echelmeyer

Voigt

et al. 2010

Zeitschrift Für Physikalische Chemie

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Ionic TransportResearch on solid ionic conductors for use as electrolytes in all solid state batteries still constitutes a rather vivid branch of today's materials science. Despite enormous efforts, neither the development of a solid electrolyte fulfilling the key requirements such as mechanical stability and high ionic conductivity at ambient temperature has been successful nor has an extended understanding of the local Li coordination motifs in the often amorphous systems been obtained. In this contribution, recent progress both in the development of novel solid state electrolytes with high ionic conductivity and mechanical stability and in the characterization of the local Li coordination motifs in these electrolytes from our laboratory is presented. The work was performed as a project within the framework of the Collaborative Research Centre SFB 458 "Ionic Motion in Materials with Disordered Structures -From Elementary Steps to Macroscopic Transport". Results will be given for polymer electrolytes based on polyethylene oxide (PEO), polyphosphazene (PPZ) and polyacrylonitrile (PAN) with various Li salts, nano-composites of these polymer electrolytes and Al 2 O 3 as a ceramic filler, novel inorganic/organic hybrid electrolytes, in which a mixture of an ionic liquid and Li salt is confined within the pore system of a SiO 2 glass, and a crystalline electrolyte, Li 5 La 3 Nb 2 O 12 . Employing a range of advanced solid state NMR methodologies including dipolar based NMR techniques and pulsed field gradient (PFG) NMR and impedance spectroscopy we were able to obtain a detailed knowledge about the local Li cation coordination motifs and the mechanism of Li transport in these electrolytes. Especially the hybrid electrolytes and the salt rich PAN based polymer electrolytes were identified as rather promising materials which combine a high ionic conductivity and mechanical stability.

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“…1,2 Since this effect can be attributed to preferential ion diffusion along the network of the insulating particles, these electrolytes rely particularly sensitively on the formation and stability of the network. 3,4 Technologically, they are especially interesting for Li-based batteries, as they improve the mechanical properties substantially and may even exhibit higher Li + conductivities.…”

mentioning

confidence: 99%

Ion conducting particle networks in liquids: modeling of network percolation and stability

Jarosik

Traub

Maier

et al. 2011

Phys. Chem. Chem. Phys.

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Networks of inorganic particles (here SiO 2 ) formed within organic liquids play an important role in science. Recently they have been considered as 'soggy sand' electrolytes for Li-based batteries with a fascinating combination of mechanical and electrical properties. In this communication we model formation and stability of the networks by Cluster-Cluster Aggregation followed by coarsening on a different time scale. The comparison of computer simulations based on our model with experimental results obtained for LiClO 4 containing polyethylene glycol reveals (i) that the percolation threshold for interfacial conductivity is very small, (ii) that the networks once formed coarsen with a time constant that is roughly independent of volume fraction and size-to a denser aggregate which then stays stable under operating condition. (iii) Trapping of the conducting solvent at high packing is also revealed.Coherent networks of solids in liquids play an important role in colloid chemistry and physics and have a broad range of technological applications. Perhaps the most popular examples are dispersion paints that consist of inorganic particles dispersed in appropriate liquids. When a shear stress is applied, the network of the particles breaks up, and as a result the overall viscosity decreases. This thixotropy is beneficial for the process of painting. Brushing exerts shear stress and the resulting thinning facilitates applying the paint. Other examples are gels in which-unlike sols-colloidal particles form percolating networks.Here we will focus on the recently discovered ''soggy sand'' electrolytes in which by admixing fine insulating particles to salt containing liquids the overall ionic conductivity is pronouncedly increased.

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Second Phase Effects on the Conductivity of Non‐Aqueous Salt Solutions: “Soggy Sand Electrolytes”

Cited by 223 publications

References 20 publications

Space Charge Layer Effect in Solid State Ion Conductors and Lithium Batteries: Principle and Perspective

Space Charge Layer Effect in Solid State Ion Conductors and Lithium Batteries: Principle and Perspective

Local Li Cation Coordination and Dynamics in Novel Solid Electrolytes

Ion conducting particle networks in liquids: modeling of network percolation and stability

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