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Abstract <p>In order to expand the range of electrolytes for low-temperature double-layer supercapacitors, the possibility of using a 2.5 M PCl<sub>5</sub> solution in anhydrous hydrogen fluoride as an electrolyte combined with electrodes made of activated carbon cloth CH-900-20 was investigated. Upon the temperature decrease from +20 to –65°C, the specific capacitance of the activated carbon cloth in this electrolyte was shown to decrease linearly from 225 to 200 F/g. The replacing of PCl<sub>5</sub> with P<sub>2</sub>O<sub>5</sub> resulted in the appearance of water in the electrolyte, due to the latter’s interaction with HF, the appearance of a noticeable pseudocapacitance at positive temperatures, and a decrease in the capacitance at the temperature of ‒65°C.</p>

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Anhydrous Hydrogen Fluoride as a Solvent for Electrolytes of Supercapacitors Operating at Extremely Low Temperatures

  • 期刊论文

  • 发表日期：

    2025年8月1日

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  • A. M. Skundin,
  • D. Yu. Gryzlov,
  • A. Yu. Rychagov,
  • F. A. Voroshilov,
  • T. L. Kulova,
  • V. N. Andreev

摘要

Abstract

In order to expand the range of electrolytes for low-temperature double-layer supercapacitors, the possibility of using a 2.5 M PCl5 solution in anhydrous hydrogen fluoride as an electrolyte combined with electrodes made of activated carbon cloth CH-900-20 was investigated. Upon the temperature decrease from +20 to –65°C, the specific capacitance of the activated carbon cloth in this electrolyte was shown to decrease linearly from 225 to 200 F/g. The replacing of PCl5 with P2O5 resulted in the appearance of water in the electrolyte, due to the latter’s interaction with HF, the appearance of a noticeable pseudocapacitance at positive temperatures, and a decrease in the capacitance at the temperature of ‒65°C.