Ionic conductivity

About: Ionic conductivity is a research topic. Over the lifetime, 19412 publications have been published within this topic receiving 519167 citations.

Synthesis and Characterization of Poly(Ethylene Glycol)-Based Single-Ion Conductors

Abstract: A series of ionomers was synthesized by melt polycondensation of poly(ethylene glycol) (PEG) oligomers and dimethyl 5-sulfoisophthalate sodium salt. The molar mass of the PEG spacer was either 400, 600, or 900, and the cation was exchanged from sodium to lithium or cesium by dialysis. Since the anions are covalently attached to the ionomer chains and are essentially immobile relative to the cations, these ionomers are excellent models for polymeric single-ion electrolytes. The experimental evidence to date suggests that the cations do not aggregate to form the usual ion clusters seen in other ionomers. No relaxation time associated with ion clusters was observed in rheological measurements, nor was an “ionomer peak” observed in small-angle X-ray scattering measurements. The ionic conductivity increases significantly with increasing PEG spacer molecular weight, although the total cation content decreases at the same time. At room temperature, the highest conductivity (10-6 S/cm) was achieved for the sodium...

Ionic conductivity promotion of polymer electrolyte with ionic liquid grafted oxides for all-solid-state lithium–sulfur batteries

Abstract: Recently, great attention has been paid to all-solid-state lithium–sulfur (Li–S) batteries for their high energy density and security But large-scale application of this technology is hindered by the poor ionic conductivity of solid-state electrolytes and high interfacial resistance at ambient temperature In addition, seeking an appropriate carbon matrix for solid-state Li–S batteries is challenging Herein, with the purpose of addressing these problems, N-doped carbon nanosheets (N-CNs) as a matrix for optimizing a sulfur cathode was successfully prepared Furthermore, we fabricated innovative poly(ethylene oxide) (PEO)-based solid-state polymer electrolytes (SSPEs) containing ionic liquid grafted oxide nanoparticles (IL@NPs), which showed high ionic conductivity at low temperatures Additionally, the differences among IL@NPs based on ZrO2, TiO2, and SiO2 are compared The electrolyte with IL@ZrO2 showed the highest ionic conductivity of 495 × 10−4, 232 × 10−4 S cm−1 at 50 and 37 °C, respectively With advanced and innovative designs in both cathode and electrolyte, our solid-state Li–S battery exhibits improved electrochemical performance The battery with SSPEs based on IL@ZrO2 delivered a high specific capacity of 986, 600 mA h g−1 at 50 and 37 °C, respectively It's believed that this strategy, using IL@NPs added SSPEs and the N-CNs/S cathode, may shed light on prospective applications with all-solid-state Li–S batteries

Critical Role of Polymeric Binders on the Electronic Transport Properties of Composites Electrode

Abstract: The role of the polymeric binder nature and composition on the electronic transport properties of composite electrodes based on Li 1.2 V 3 O 8 , carbon black (CB), and poly(ethylene oxide) (PEO)/poly(vinylidene difluoride)-co-hexafluoropropylene/ethylene carbonate-propylene carbonate (EC-PC)/Li bis(trifluoromethansulfon)imide binders were examined. The variation of the electrical conductivity vs CB volume fraction is typical of tunneling-percolation systems. Lower percolation threshold ,; found for preplasticized binders is related to a more efficient CB dispersion due to the presence of EC-PC in the liquid suspension at the time of the composite processing. Above Φ c the conductivity is a unique function of the PEO to CB concentration ratio in the suspension, log σ = log(σ CB )-aΦ PEO /Φ CB . This ratio controls the amount of polymer that adsorbs at the surface of the CB particles before the CB conducting network forms. The Li + /e - insertion behavior was studied at low current rate, for which ionic conductivity is not a limiting factor. The electrochemical capacity sharply increases at Φ c . However, for CB content typical of practical composite electrodes, the electronic conductivity of the CB network is not the only parameter that governs the electrode performance. It depends also on the electronic wiring at the CB/Li 1.2 V 3 O 8 interface, which is improved when adding EC-PC and lithium salt in the formulation.