(C4H9)3CH3NBF4–Сnanodiamonds

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Abstract

The paper presents the results of studies of the structural, thermal and transport properties of solid composite electrolytes (1 – x)(C4H9)3CH3NBF4 – xCND (where CND are nanosized diamonds, 0 ≤ x < 1, x is the mole fraction). It has been shown by the Powley method that the crystal structure of the low-temperature phase (C4H9)3CH3NBF4 is described by the space symmetry group P42/ncm. It was found that the addition of a nanodiamond inert additive leads to an increase in the electrical conductivity of the composite electrolyte by 4 orders of magnitude up to a value of 1.3∙10–3 S/cm at 145°C at x = 0.98. The theoretical dependences describe well the experimental data in the concentration range 0 ≤ x ≤ 0.99 at temperatures of 84 and 127 оC.

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About the authors

I. A. Stebnitsky

Institute of Solid State Chemistry and Mechanochemistry SB RAS; Novosibirsk State University

Author for correspondence.
Email: YuliaM@solid.nsc.ru
Russian Federation, Novosibirsk; Novosibirsk

N. F. Uvarov

Institute of Solid State Chemistry and Mechanochemistry SB RAS; Novosibirsk State University

Email: YuliaM@solid.nsc.ru
Russian Federation, Novosibirsk; Novosibirsk

Yu. G. Mateyshina

Institute of Solid State Chemistry and Mechanochemistry SB RAS; Novosibirsk State University

Email: YuliaM@solid.nsc.ru
Russian Federation, Novosibirsk; Novosibirsk

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Supplementary files

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2. Fig. 1. X-ray phase analysis data for composites (1 - x) (C4H9)3CH3NBF4 – xCHA. The right figure shows a section of the diffraction pattern in the angle range 35 < 2θ < 50 degrees, in which there is a reflection related to nanodiamonds.

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3. Fig. 2. DSC curves for composites (1-x) (C4H9)3CH3NBF4 – xCHA, obtained during the first (a) and second (b) heating.

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4. Fig. 3. Experimental values ​​of the enthalpy of melting of tributylmethylammonium tetrafluoroborate in composites (1 – x) (C4H9)3CH3NBF4 – xCHA (symbols) in comparison with the expected value for a mechanical mixture of salt + nanodiamonds (line) depending on the mole (a) and volume (b) fraction nanodiamonds.

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5. Fig. 4. Impedance hodographs of the 0.01(C4H9)3CH3NBF4 – 0.99CHA composites, measured at temperatures of 100 and 152 °C. Equivalent circuit used to interpret the data, where Rb is the volume resistance of the sample, CPEb and CPEe are the constant phase elements describing the geometric capacitance of the sample and the electrode impedance, respectively (b).

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6. Fig. 5. Temperature dependence of the conductivity of the composites (1 – x) (C4H9)3CH3NBF4 – xCNA (x is the mole fraction of CNA) (a) and the dependence of the specific conductivity of the composites (1 – x)(C4H9)3CH3NBF4 – xCNA depending on the concentration of CNA nanodiamonds in composites at temperatures of 90 and 130 oC (b).

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7. Fig. 6. Experimental (dots) and theoretical (solid line) concentration dependences of the specific conductivity of composites (1 – x) (C4H9)3CH3NBF4 – xCHA on the mole fraction (a) and volume fraction (b) of nanodiamonds for temperatures of 84 and 127 oC.

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