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首页> 外文期刊>Journal of power sources >A comparative study on the solubility and stability of p-phenylenediamine-based organic redox couples for non-aqueous flow batteries
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A comparative study on the solubility and stability of p-phenylenediamine-based organic redox couples for non-aqueous flow batteries

机译：对苯二胺类有机氧化还原对非水液电池的溶解度和稳定性的比较研究

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摘要

A methyl-substituted p-phenylenediamine (PD), N,N,N',N'-tetramethyl-p-phenylenediamine (TMPD), is examined as a positive redox couple with high energy density for non-aqueous Li-flow batteries. Methyl substitution affects the solubility of the redox couple, as the solubility is increased by a factor of ten, to a maximum solubility of 5.0 M in 1.0 M lithium tetrafluoroborate-propylene carbonate supporting electrolyte due to elimination of the hydrogen bonding between the solute molecules. The methyl substitution also enhances the chemical stability of the cation radical and di-cation being generated from PD, as the redox center is shielded by the methyl groups. Furthermore, this organic redox couple demonstrate two-electron redox reactions at 3.2 and 3.8 V (vs. Li/Li+); therefore, the volumetric capacity is twice higher compared to conventional one-electron involved redox couples. In a non-flowing Li/TMPD coin cell, this organic redox couple demonstrates very stable cycleability as a positive redox couple for non aqueous flow batteries. (C) 2017 Elsevier B.V. All rights reserved.
机译：甲基取代的对苯二胺（PD），N，N，N'，N'-四甲基对苯二胺（TMPD）作为非水Li-flow电池的正极氧化还原对具有高能量密度。由于溶解性分子之间的氢键消除，当溶解度增加十倍时，甲基取代影响氧化还原对的溶解度，使其在1.0 M四氟硼酸锂-碳酸亚丙酯支持的电解质中的最大溶解度达到5.0M。甲基取代还增强了由PD生成的阳离子自由基和二阳离子的化学稳定性，因为氧化还原中心被甲基保护。此外，这种有机氧化还原对在3.2和3.8 V（vs. Li / Li +）处显示了两个电子的氧化还原反应。因此，其体积容量是传统的单电子氧化还原对的两倍。在非流动Li / TMPD纽扣电池中，这种有机氧化还原电对作为非水性流动电池的正氧化还原电对表现出非常稳定的循环能力。 （C）2017 Elsevier B.V.保留所有权利。

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  • 来源
    《Journal of power sources》 |2017年第30期|264-269|共6页
  • 作者

    Kim Hyun-seung; Lee Keon-Joon; Han Young-Kyu; Ryu Ji Heon; Oh Seung M.;

  • 作者单位

    Seoul Natl Univ, Dept Chem & Biol Engn, Seoul 151742, South Korea;

    Dongguk Univ, Dept Energy & Mat Engn & Adv Energy, Seoul 100715, South Korea|Dongguk Univ, Elect Mat Res Ctr, Seoul 100715, South Korea;

    Dongguk Univ, Dept Energy & Mat Engn & Adv Energy, Seoul 100715, South Korea|Dongguk Univ, Elect Mat Res Ctr, Seoul 100715, South Korea;

    Korea Polytech Univ, Grad Sch Knowledge Based Technol & Energy, 2121 Jeongwang Dong, Siheung Si 429793, Gyeonggi Do, South Korea;

    Seoul Natl Univ, Dept Chem & Biol Engn, Seoul 151742, South Korea;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Li-flow batteries; Organic redox couples; Non-aqueous electrolytes; Solubility; Chemical stability;

    机译：锂液电池;有机氧化还原对;非水电解质;溶解度;化学稳定性;

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