In situ time-resolved dispersive X-ray absorption fine structure analysis of BaTiO3-LiCoO2 composites for lithium ion batteries

Takasi Teranisi, Yumi Yoshikawa, Ryota Miyahara, Hidetaka Hayashi, Akira Kishimoto, Misaki Katayama, Yasuhiro Inada

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

In this study, in situ time-resolved dispersive X-ray absorption fine structure (DXAFS) analysis of BaTiO3LiCoO2 (BTLC) composites for lithium ion batteries was performed to characterize the cobalt ion valence shift between oxidized and reduced states of driven cells, in an attempt to better understand the contribution of ferroelectric solid electrolyte interfaces (SEIs) to chargedischarge rates. Two types of artificial SEIs, ferroelectric BT and paraelectric Al2O3, were compared. The magnitude of the shift in the X-ray absorption energy at the peak of the white line, E1, during charging and discharging at a 10C rate, increased in the order of bare LC (0.264 eV) <Al2O3 1 mol% (0.497 eV) <BT 1 mol% (1.15 eV); the corresponding discharge capacities of the laminated cells at 10C were as follows: bare LC (11.6mAh/g) <Al2O3 (41.8mAh/g) <BT (95.1mAh/g). The increase in E1, i.e., the oxidation of Co during charging, intensified under a higher applied potential for the BT-decorated composite compared with that of the Al2O3-coated specimen. The stronger oxidation of Co for BTLC under application of a large electric field was attributed to the strengthened polarization due to the larger permittivity of BT.

Original languageEnglish
Pages (from-to)659-663
Number of pages5
JournalNippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan
Volume124
Issue number6
DOIs
Publication statusPublished - Jun 1 2016

Keywords

  • Barium titanate
  • High rate capability
  • Lithium ion battery
  • Polarization
  • Solid electrolyte interface
  • XAFS

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry
  • Chemistry(all)
  • Condensed Matter Physics

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