储能科学与技术 ›› 2019, Vol. 8 ›› Issue (6): 1171-1175.doi: 10.12028/j.issn.2095-4239.2019.0128

• 研究开发 • 上一篇    下一篇

Li(Ni1/3Co1/3Mn1/3)O2/graphite电池在备用电源工况下的交流阻抗

李守涛1, 孟庆函1, 阮一钊1, 范茂松2, 刘皓2   

  1. 1 北京化工大学 材料科学与工程学院, 北京 100029;
    2 中国电力科学研究院有限公司, 北京 100192
  • 收稿日期:2019-06-11 修回日期:2019-08-06 出版日期:2019-11-01 发布日期:2019-11-01
  • 通讯作者: 孟庆函,博士,教授。E-mail:qhmeng@mail.buct.edu.cn。
  • 作者简介:李守涛(1993-),男,硕士研究生,研究方向为锂离子电池,E-mail:1766715968@qq.com
  • 基金资助:
    国家自然科学基金项目（51372011）。

AC Impedance of Li(Ni1/3Co1/3Mn1/3)O2/graphite cell as UPS

LI Shoutao1, MENG Qinghan1, RUAN Yizhao1, FAN Maosong2, LIU Hao2   

  1. 1 School of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China;
    2 China Electric Power Research Institute, Beijing 100192, China
  • Received:2019-06-11 Revised:2019-08-06 Online:2019-11-01 Published:2019-11-01

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摘要： 以Li（Ni1/3Co1/3Mn1/3）O2/graphite动力电池为研究对象，在模拟备用电源工况下对动力电池进行交流阻抗测试。通过建立等效电路来研究欧姆阻抗Rs、电荷传递阻抗Rct和扩散阻抗CPEW随不同搁置时间、荷电状态（state of charge，SOC）的变化规律，研究Li（Ni1/3Co1/3Mn1/3）O2/graphite动力电池在备用电源工况下，容量和阻抗的变化趋势。结果表明：随着搁置时间的增加，电池容量衰减1.7%左右。随着搁置时间的增加，不同SOC下的欧姆阻抗Rs具有相同的变化趋势，电荷传递阻抗明显增加。随着SOC的降低，由双电层产生的电荷传递阻抗在逐渐增加。在SOC=0%时，扩散阻抗随搁置时间的增加而增加，在SOC=100%、50%的扩散阻抗有细微的增加。容量衰退和阻抗结果显示出Li（Ni1/3Co1/3Mn1/3）O2/graphite动力电池可以很好地在备用电源工况上使用。

关键词: 锂离子电池, 交流阻抗, 备用电源工况

Abstract: AC impedance of Li(Ni1/3Co1/3Mn1/3)O2/graphite power battery was tested under simulated UPS. The effect of different storage time and SOC on ohmic resistance Rs, charge transfer impedance Rct and diffusion impedance CPEW was analyze by the equivalent circuit. The variation trend of capacity and impedance of Li(Ni1/3Co1/3Mn1/3)O2/graphite power battery under UPS was studied. The results show that the capacity of the cell decrease about 1.7%, the ohmic resistance Rs at different SOC has the same tendency to change and the charge transfer impedance increase significantly with increasing storage days. The charge transfer impedance generated by the electric double layer is increases significantly as SOC decreases. The diffusion resistance (SOC=0%) increases and the diffusion impedances at SOC=100% and 50% slightly increase as storage day increases. Capacity degradation and impedance results show that the Li(Ni1/3Co1/3Mn1/3)O2/graphite power battery can be used well in UPS.

Key words: lithium-ion cell, AC impedance, UPS

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