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首页> 外文期刊>Journal of power sources >Manganese sequestration and improved high-temperature cycling of Li-ion batteries by polymeric aza-15-crown-5
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Manganese sequestration and improved high-temperature cycling of Li-ion batteries by polymeric aza-15-crown-5

机译：聚合物aza-15-crown-5隔离锰并改善锂离子电池的高温循环

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摘要

Mn cation trapping by polymeric aza-15-crown-5 ethers is an effective means for mitigating the consequences of Mn dissolution in Li-ion batteries. Mn cations trapping was investigated in lithium manganese oxide (LMO) spinel-graphite (GR) cells containing 1 M LiPF_6 in ethylene carbonate (EC):diethyl carbonate (DEC) 1:2 v/v. A commercial polyolefin separator membrane coated with poly [divinylbenzene-(vinylbenzyl-aza-15-crown-5)-vinylbenzylchloride)] effected a 39% reduction in capacity loss rate during cycling at 50 ℃ with 100% depth of discharge (DOD) at C/5 rate. Simultaneously, a 50-60% reduction in the Mn deposited at the negative electrode, and a 6× to 10× increase in the Mn on the coated separator were observed for cells with coated separators, over baseline cells with plain separators. X-ray absorption near-edge spectroscopy (XANES) yielded average oxidation states near +3 for Mn cations in graphite electrodes and separators from cycled cells, suggesting that Mn metal or in oxidation state +2 can only be minor fractions of the Mn existing outside the positive electrode. We discuss the implications of these results for choosing an optimal chelating agent. We also show that the cation chela ting polymer reported here is compatible with existing manufacturing processes for Li-ion battery separators.
机译：通过聚合的aza-15-crown-5醚捕获Mn阳离子是减轻Mn在锂离子电池中溶解的后果的有效手段。在碳酸亚乙酯（EC）：碳酸二乙酯（DEC）1：2 v / v中包含1 M LiPF_6的锂锰氧化物（LMO）尖晶石-石墨（GR）电池中研究了Mn阳离子的捕集。涂有聚[二乙烯基苯-（乙烯基苄基-氮杂-15-皇冠-5）-乙烯基苄基氯）的商用聚烯烃隔膜膜可在50℃循环时放电容量（DOD）为100％时降低39％的容量损失率。 C / 5费率。同时，与具有普通隔板的基线电池相比，对于具有涂层隔板的电池，观察到在负极上沉积的Mn降低了50-60％，而在涂覆隔板上的Mn增加了6到10倍。 X射线吸收近边缘光谱（XANES）在石墨电极和循环电池的隔板中产生的Mn阳离子的平均氧化态接近+3，这表明Mn金属或氧化态+2只能是存在于外部的Mn的很小一部分正极。我们讨论了这些结果对选择最佳螯合剂的影响。我们还表明，此处报道的阳离子螯合聚合物与锂离子电池隔膜的现有制造工艺兼容。

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  • 来源
    《Journal of power sources》 |2014年第25期|1134-1141|共8页
  • 作者

    Zicheng Li; Allen D. Pauric; Gillian R. Goward; Timothy J. Fuller; Joseph M. Ziegelbauer; Michael P. Balogh; Ion C. Halalay;

  • 作者单位

    Optimal CAE, 14492 Sheldon Road, Suite 300, Plymouth, MI 48170, USA;

    Department of Chemistry, Chemistry Department, McMaster University, 1280 Main Street W, Room ABB 268, Hamilton, ON L8S 4K1, Canada;

    Department of Chemistry, Chemistry Department, McMaster University, 1280 Main Street W, Room ABB 268, Hamilton, ON L8S 4K1, Canada;

    General Motors Global Powertrain, 30500 Mound Road, M/C 480-102-000, Warren, MI 48090-9055, USA;

    General Motors Global Powertrain, 30500 Mound Road, M/C 480-102-000, Warren, MI 48090-9055, USA;

    General Motors Global Research & Development, 30500 Mound Road, M/C 480-102-000, Warren, MI 48090-9055, USA;

    General Motors Global Research & Development, 30500 Mound Road, M/C 480-102-000, Warren, MI 48090-9055, USA;

  • 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

    Manganese dissolution; Oxidation state; Li_xMn_2O_4 spinel; Capacity fade; polymeric crown ether; Aza-15-crown-5;

    机译：锰溶解;氧化态Li_xMn_2O_4尖晶石;容量衰减;聚合冠醚;氮杂15冠5;

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