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Studies on LiFePO_4 as Cathode Material in Li-Ion Batteries

机译:LiFePO_4作为锂离子电池正极材料的研究

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摘要

Lithium iron phosphate is a promising cathode material for the use in lithium-ion batteries meeting the demands of good stability during cycling and safe operation due to reduced risk of thermal runaway. However, slow solid state diffusion and poor electrical conductivity reduce power capability. For further improvement, the identification of the rate determining processes is necessary. Electrochemical impedance spectroscopy (EIS) has proven to be a powerful tool for the characterization of electrochemical systems. In this contribution a deconvolution of the impedance with the distribution of relaxation times (DRT) is used to obtain a better resolution in frequency domain. Therewith, the cathodic and anodic polarization processes are identified and an impedance model for the cell is proposed.
机译:磷酸铁锂是一种有前途的正极材料,可用于锂离子电池,由于降低了热失控的风险,可满足循环中良好稳定性和安全操作的要求。然而,缓慢的固态扩散和差的电导率降低了功率能力。为了进一步改进,必须确定速率确定过程。电化学阻抗谱(EIS)已被证明是表征电化学系统的有力工具。在这种贡献中,阻抗的反卷积随弛豫时间(DRT)的分布用于在频域中获得更好的分辨率。从而,识别出阴极和阳极极化过程,并提出了该电池的阻抗模型。

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  • 来源
  • 会议地点 Vancouver(CA);Vancouver(CA)
  • 作者单位

    Institut fur Werkstoffe der Elektrotechnik (IWE), Karlsruher Institut fur Technologie (KIT), D-76131 Karlsruhe, Germany;

    Institut fur Werkstoffe der Elektrotechnik (IWE), Karlsruher Institut fur Technologie (KIT), D-76131 Karlsruhe, Germany;

    Institut fur Werkstoffe der Elektrotechnik (IWE), Karlsruher Institut fur Technologie (KIT), D-76131 Karlsruhe, Germany;

    Institut fur Werkstoffe der Elektrotechnik (IWE), Karlsruher Institut fur Technologie (KIT), D-76131 Karlsruhe, Germany;

    Institut fur Werkstoffe der Elektrotechnik (IWE), Karlsruher Institut fur Technologie (KIT), D-76131 Karlsruhe, Germany;

    Institut fur Werkstoffe der Elektrotechnik (IWE), Karlsruher Institut fur Technologie (KIT), D-76131 Karlsruhe, Germany;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 独立电源技术(直接发电);
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