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Drude, Hall and Maximal conductivities: A Unified Complex Model

Journal of Modern Physics 2012年第9期3卷 1040-1045页

作者： Arbab I. Arbab Department of Physics Faculty of Science University of Khartoum P.O. Box 321 Khartoum 11115 Sudan

By adopting a complex formulation of Ohm’s law, we arrive at combined equations connecting the conductivities of conductors. The horizontal resistivity is equal to the inverse of Drude’s conductivity δo( ), and the vertical resistivity (ρy) is equal to the Hall’s conductivity ( δH). At high magnetic field, the horizontal conductivity becomes exceedingly small, whereas the vertical conductivity equals to Hall’s conductivity. The Hall’s conductivity is shown to represent the maximal conductivity of conductors. Drude’s and Hall’s conductivities are related by δo =δHωC , where ωC is the cyclotron frequency, and is the relaxation time. The quantization of Hall’s conductivity is attributed to the fact that the magnetic flux enclosed by the conductor is carried by electrons each with h/e, where h is the Planck’s constant and e is the electron’s charge. The Drude’s conductance is found to be equal to Hall's conductance provided the magnetic flux enclosed by the conductor is a multiple of h/e.

关键词： Drude’s Conductivity Hall’s Conductivity Maximal Conductivity Unified conductivities

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A low cost composite quasi-solid electrolyte of LATP, TEGDME,and LiTFSI for rechargeable lithium batteries

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Chinese Physics B 2017年第6期26卷 471-476页

作者：黄杰彭佳悦凌仕刚杨琪邱纪亮卢嘉泽郑杰允李泓陈立泉 Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China University of Chinese Academy of Sciences P. O. Box 4588 Beijing 100049 China

The composite quasi solid state electrolytes（CQSE） is firstly synthesized with quasi solid state electrolytes（QSE） and lithium-ion-conducting material Li1.4Al0.4Ti1.6（PO4）3（LATP）, and the QSE consists of [LiG4][TFSI] with fumed silica nanoparticles. Compared with LATP, CQSE greatly improves the interface conductance of solid electrolytes. In addition,it has lower liquid volume relative to QSE. Although the liquid volume fraction of CQSE is droped to 60%, its conductivity can also reach 1.39 × 10^-4S/cm at 20℃. Linear sweep voltammetry（LSV） is conducted on each composite *** results show the possibility that CQSE has superior electrochemical stability up to 5.0 V versus Li/Li^＋1. TG curves also show that composite electrolytes have higher thermal stability. In addition, the performance of Li/QSE/Li Mn2O4 and Li/CQSE/Li Mn2O4 batteries is evaluated and shows good electrochemical characteristics at 60℃.

关键词： quasi solid state electrolytes Li1.4Al0.4Ti1.6(PO4)3 conductivities

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Machine Learning towards Screening Solid-state Lithium Ion Conductors

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Chinese Journal of Structural Chemistry 2020年第1期39卷 8-10,1页

作者： LU Yang CHEN Xiang ZHAO Chen-Zi ZHANG Qiang Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijing 100084China

Machine learning is an emerging method to discover new materials with specific *** unsupervised machine learning research is highlighted to discover new potential lithium ionic conductors by screening and clustering l... 详细信息

关键词： unsupervised machine learning first principles calculation solid state lithium ion conductors anion frameworks high ionic conductivities

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Electrochemical Performance of PEO_(10)LiX-Li_2TiO_3 Composite Polymer Electrolytes

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Chinese Journal of Chemistry 2004年第1期22卷 47-50页

作者：路密史鹏飞 Department of Applied Chemistry Harbin Institute of Technology

The conductivities of polyethylene oxide (PEO)-based polymer electrolytes (PE) can be improved by the addition of inorganic inert powder. The composite polymer electrolytes (CPE) PEO10LiX (X=4ClO- or 322N(CFSO)-)-Li2TiO3 were prepared by solution casting with inorganic solid electrolyte Li2TiO3 powder as a filler. Results showed that the conductivities of PEO10LiClO4-3wt% Li2TiO3 and PEO10LiN(CF3SO2)2-10wt% Li2TiO3 at 30 ℃ were 8.6×10-6 and 5.6×10-5 S·cm-1, respectively. The conductivities of CPE increased with the decrease of filler抯 particle size. The ionic conduction mechanism analysis showed that there may be three conduction routes in the CPE, i.e., PEO bulk, polymer-filler interface and Li2TiO3 crystal.

关键词： rechargeable lithium batteries polymer electrolyte composite polymer electrolyte conductivities polyethylene oxide Li2TiO3

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Electrical Properties and Phase Behavior of Proton Conducting Nanocomposites Based on the Polymer System (1 - x)[PVOH + H3PO2+ H2O]·x(Nb2O5)

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American Journal of Analytical Chemistry 2014年第5期5卷 301-307页

作者： Angélica María Mazuera Rubén Antonio Vargas TFnoM Group Universidad del Valle Cali Colombia

In the present work, novel blend polymer electrolyte membranes using poly(vinyl alcohol) (PVA), doped with hypophosphorous acid (H3PO2) and reinforced with porous niobium oxide (Nb2O5) microparticles in different compositions were prepared by the solution-casting technique. Their phase behavior and ionic conductivity were studied by differential scanning calorimetric (DSC), thermogravimetric analysis (TGA) and impedance spectroscopy (IS) in the radio-frequency range. Using a constant H3PO2/PVA weigh ratio of 0.25, it was found that the water content in the blended hydrogel membranes increased with increasing the filler Nb2O5 content, thus increasing the electrical conductivity. However, the suitable weight ratio of Nb2O5:(H3PO2/PVA) for the blend performance (both mechanically and electrically) was x = 0.075, with a maximum ionic conductivity of 2.7?× 10﹣3 S·cm﹣1 at 120°C. For all blends prepared, the lost tangent plots show asymmetrical peaks, as a consequence of correlations in the mobile ion diffusion as a function of frequency. Although this “universal dynamic response” was observed at all temperatures, variations in the tan(δ) relaxation peaks indicate a decrease of ionic correlation when the temperature is increased. Both the dc conductivity and tan(δ) peaks frequency dependency are thermally activated, following an Arrhenius-type behavior with activation energy of the same order, indicating that the corresponding ionic processes have the same origin, i.e., proton jump among available sites in the polymer matrix. The additions of oxide particles to the membranes improve their thermal and electrical properties, attributed to an approximation effect.

关键词： Nanocomposite Polymer Blend Impedance Study DSC/TGA Ionic conductivities Polymer Electrolytes Phase Behavior

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