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首页> 外文期刊>Zeitschrift fur Anorganische und Allgemeine Chemie >Pre-activation and Defects Introduced via Citric Acid to Mitigate Capacity and Voltage Fading in Li-rich Cathode
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Pre-activation and Defects Introduced via Citric Acid to Mitigate Capacity and Voltage Fading in Li-rich Cathode

机译：通过柠檬酸引入预活化和缺陷，以减轻富富阴极的容量和电压衰落

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摘要

The application of Li-rich and Mn-based layered cathode materials is impeded by the discharge voltage decay and capacity fading upon cycling, despite their high specific capacity. Here, we combine pre-activation and nanoscale defects modification of lithium rich and manganese based layered materials to mitigate the above two serious problems through improved anionic redox activity and Li+ conductivity. The optimum constructed nanoscale defects rich cathode material delivers a reduced voltage fading rate of 1.27 mV per cycle compared to 3.7 mV per cycle for the pristine material after 200 cycles at 1 C rate. Moreover, the nanoscale defects rich material delivers a high specific discharge capacity of 173.1 mAh·g~(-1) with a high capacity retention of 99.5% after 200 cycles at 1 C rate superior than the pristine material (89.3 mAh·g~(-1) and 53.4%, respectively). This study highlights the reversibility of oxygen redox in electrochemical stability and effectiveness of nanoscale defects in stabilize voltage.
机译：尽管锂基和锰基层状阴极材料具有较高的比容量，但其在循环过程中的放电电压衰减和容量衰减阻碍了其应用。在这里，我们结合富锂和锰基层状材料的预活化和纳米级缺陷修饰，通过改善阴离子氧化还原活性和Li+导电性来缓解上述两个严重问题。最佳构造的纳米级缺陷丰富的阴极材料提供了每周期1.27 mV的电压衰减率，相比之下，原始材料在以1 C速率进行200次循环后的电压衰减率为3.7 mV。此外，纳米级缺陷丰富的材料在1 C速率下循环200次后，比原始材料（分别为89.3 mAh·g-1和53.4%）具有173.1 mAh·g-1的高比放电容量和99.5%的高容量保持率。这项研究强调了氧氧化还原在电化学稳定性方面的可逆性，以及纳米级缺陷在稳定电压方面的有效性。

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  • 作者

    Siyuan Li; Jiapeng Ji; Zeheng Li; Lijing Yan; Wei Jiang; Min Ling; Zhan Lin; Chengdu Liang;

  • 作者单位

    Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology College of Chemical and Biological Engineering Zhejiang University Hangzhou 310027 P. R. China;

    Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology College of Chemical and Biological Engineering Zhejiang University Hangzhou 310027 P. R. China;

    Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology College of Chemical and Biological Engineering Zhejiang University Hangzhou 310027 P. R. China;

    Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology College of Chemical and Biological Engineering Zhejiang University Hangzhou 310027 P. R. China;

    Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology College of Chemical and Biological Engineering Zhejiang University Hangzhou 310027 P. R. China;

    Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology College of Chemical and Biological Engineering Zhejiang University Hangzhou 310027 P. R. China;

    School of Chemical Engineering and Light Industry Guangzhou University of Technology Guangzhou 510006 P. R. China;

    Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology College of Chemical and Biological Engineering Zhejiang University Hangzhou 310027 P. R. China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
  • 关键词

    Pre-activation; Li-rich cathode; Nanoscale defects; Citric acid; Voltage decay;

    机译：预活化;富含量的阴极;纳米级缺陷;柠檬酸;电压衰减;

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