Simulation of the effect of contact area loss in all-solid-state Li-ion batteries

Hong Kang Tian, Yue Qi

Research output: Contribution to journalArticle

Abstract

Maintaining the physical contact between the solid electrolyte and the electrode is important to improve the performance of all-solid-state batteries. Imperfect contact can be formed during cell fabrication and will be worsened due to cycling, resulting in degradation of the battery performance. In this paper, the effect of imperfect contact area was incorporated into a 1-D Newman battery model by assuming the current and Li concentration will be localized at the contacted area. Constant current discharging processes at different rates and contact areas were simulated for a film-type Li|LiPON|LiCoO2 all-solid-state Li-ion battery. The capacity drop was correlated with the contact area loss. It was found at lower cutoff voltage, the correlation is almost linear with a slope of 1; while at a higher cutoff voltage, the dropping rate is slower. To establish the relationship between the applied pressure and the contact area, Persson’s contact mechanics theory was applied, as it uses self-affined surfaces to simplify the multi-length scale contacts in all-solid-state batteries. The contact area and pressure were computed for both film-type and bulk-type all-solid-state Li-ion batteries. The model is then used to suggest how much pressures should be applied to recover the capacity drop due to contact area loss.

Original languageEnglish (US)
Pages (from-to)E3512-E3521
JournalJournal of the Electrochemical Society
Volume164
Issue number11
DOIs
StatePublished - 2017

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Materials Chemistry
  • Electrochemistry

Cite this

Simulation of the effect of contact area loss in all-solid-state Li-ion batteries. / Tian, Hong Kang; Qi, Yue.

In: Journal of the Electrochemical Society, Vol. 164, No. 11, 2017, p. E3512-E3521.

Research output: Contribution to journalArticle

Tian, Hong Kang; Qi, Yue / Simulation of the effect of contact area loss in all-solid-state Li-ion batteries.

In: Journal of the Electrochemical Society, Vol. 164, No. 11, 2017, p. E3512-E3521.

Research output: Contribution to journalArticle

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