In situ Raman spectroscopy of Li x CoO 2 cathode in Li/Li 3 PO 4 /LiCoO 2 all-solid-state thin-film lithium battery

Yasutaka Matsuda, Naoaki Kuwata, Tatsunori Okawa, Arunkumar Dorai, Osamu Kamishima, Junichi Kawamura

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)

Abstract

A thin-film battery was fabricated in the structure Li/Li 3 PO 4 /LiCoO 2 using pulsed laser deposition technique. The structural change in Li x CoO 2 during battery operation was investigated using in situ Raman spectroscopy. Raman measurements were performed from the front side of the cell beside the lithium anode through the solid electrolyte and from the backside of the cell below the lithium anode through a transparent electrode. The Raman peaks of A 1g and E g modes were observed to shift to lower and higher wavenumbers at around 4 V due to Li extraction and insertion, respectively, according to the structural change between H1 and H2 phases of the Li x CoO 2 . The Raman shift for the Li x CoO 2 showed hysteresis during the charging–discharging process when observed from the front side of the cell, although no hysteresis is seen in those measured from the backside. The observed hysteresis is explained as a delay in structural change due to the chemical diffusion of lithium in the Li x CoO 2 cathode.

Original languageEnglish
Pages (from-to)7-14
Number of pages8
JournalSolid State Ionics
Volume335
DOIs
Publication statusPublished - 2019 Jul

Keywords

  • All-solid-state lithium battery
  • In situ Raman spectroscopy
  • Lithium cobalt oxide
  • Pulsed laser deposition
  • Structural change of Li CoO
  • Thin-film battery

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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