Distinction of impedance responses of Li-ion batteries for individual electrodes using symmetric cells

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Abstract

Symmetric cells were prepared with a newly designed separable cell module, which enabled ca. 70 mm by 70 mm electrode sheets to be used for a pouch type 5 Ah class Li-ion battery (LIB). Impedance analysis of the LIB as a full cell state was successfully performed with electrochemical parameters obtained by an impedance analysis of symmetric cells of anodes and cathodes obtained from the operated Li-ion batteries. While the charge transfer resistance of the cathode was found to increase after reassembling the cells symmetrically, other electrochemical parameters were found not to change when comparing the values obtained for full cells with symmetric cells. Eelectrodes degraded by charge/discharge cycling of the battery were also investigated, and the parameter change caused by the degradation was confirmed.

Original languageEnglish
Pages (from-to)195-201
Number of pages7
JournalElectrochimica Acta
Volume131
DOIs
Publication statusPublished - 2014 Jun 10

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Keywords

  • Degradation
  • Impedance analysis
  • Lithium ion battery
  • Separable cell
  • Symmetric cell

ASJC Scopus subject areas

  • Electrochemistry
  • Chemical Engineering(all)

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