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<p>Searching for environmentally friendly salts and solvents for electrical double-layer capacitors widely employed in energy storage for fast power delivery is now an important task. Here, we describe microwave-assisted synthesis of some tetraalkylammonium bis(oxalato)borates [(CH<sub>3</sub>)<sub>4</sub>NB(OCO)<sub>4</sub>, (C<sub>2</sub>H<sub>5</sub>)<sub>4</sub>NB(OCO)<sub>4</sub>, and (C<sub>4</sub>H<sub>9</sub>)<sub>4</sub>NB(OCO)<sub>4</sub>)] and present and discuss the data on specific conductivities of their solutions in acetonitrile (AN), glutaronitrile (GN), adiponitrile (AdN), propylene carbonate (PC), and dimethyl sulfoxide (DMSO). For selected salts, the specific electrical conductivity varies in a series <i>κ</i><sub>AN</sub> &gt; &gt; <i>κ</i><sub>DMSO</sub> &gt; <i>κ</i><sub>PC</sub> &gt; <i>κ</i><sub>GN</sub> ≥ <i>κ</i><sub>AdN</sub>, which coincides with the series of fluidity <i>Φ</i> (inverse viscosity) of solvents: <i>Φ</i><sub>AN</sub> &gt; &gt; <i>Φ</i><sub>DMSO</sub> &gt; <i>Φ</i><sub>PC</sub> &gt; <i>Φ</i><sub>AdN</sub> ≥ <i>Φ</i><sub>GN</sub>. The temperature dependences of <i>κ</i> in acetonitrile correspond to the Arrhenius law; for other solvents, the Vogel–Fulcher–Taman and Litovitz equations are more suitable. For the concentration dependences of the conductivity, the Casteel–Amis equation is more suitable than the random-alloy model.</p> Graphical abstract <p></p>

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Specific conductivities of tetraalkylammonium bis(oxalato)borates in acetonitrile, dimethyl sulfoxide, and propylene carbonate

  • 期刊论文

  • 发表日期：

    2025年1月6日

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  • Sviatoslav A. Kirillov,
  • Nataliya I. Globa,
  • Yurii V. Shmatok,
  • Margaryta I. Gorobets

摘要

Searching for environmentally friendly salts and solvents for electrical double-layer capacitors widely employed in energy storage for fast power delivery is now an important task. Here, we describe microwave-assisted synthesis of some tetraalkylammonium bis(oxalato)borates [(CH3)4NB(OCO)4, (C2H5)4NB(OCO)4, and (C4H9)4NB(OCO)4)] and present and discuss the data on specific conductivities of their solutions in acetonitrile (AN), glutaronitrile (GN), adiponitrile (AdN), propylene carbonate (PC), and dimethyl sulfoxide (DMSO). For selected salts, the specific electrical conductivity varies in a series κAN > > κDMSO > κPC > κGN ≥ κAdN, which coincides with the series of fluidity Φ (inverse viscosity) of solvents: ΦAN > > ΦDMSO > ΦPC > ΦAdN ≥ ΦGN. The temperature dependences of κ in acetonitrile correspond to the Arrhenius law; for other solvents, the Vogel–Fulcher–Taman and Litovitz equations are more suitable. For the concentration dependences of the conductivity, the Casteel–Amis equation is more suitable than the random-alloy model.

Graphical abstract