Enhancement of Ultrahigh Rate Chargeability by Interfacial Nanodot BaTiO 3 Treatment on LiCoO 2 Cathode Thin Film Batteries

Sou Yasuhara, Shintaro Yasui, Takasi Teranisi, Keisuke Chajima, Yumi Yoshikawa, Yutaka Majima, Tomoyasu Taniyama, Mitsuru Itoh

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5 Citations (Scopus)

Abstract

Nanodot BaTiO 3 supported LiCoO 2 cathode thin films can dramatically improve high-rate chargeability and cyclability. The prepared BaTiO 3 nanodot is <3 nm in height and 35 nm in diameter, and its coverage is <5%. Supported by high dielectric constant materials on the surface of cathode materials, Li ion (Li + ) can intercalate through robust Li paths around the triple-phase interface consisting of the dielectric, cathode, and electrolyte. The current concentration around the triple-phase interface is observed by the finite element method and is in good agreement with the experimental data. The interfacial resistance between the cathode and electrolyte with nanodot BaTiO 3 is smaller than that without nanodot BaTiO 3 . The decomposition of the organic solvent electrolyte can prevent the fabrication of a solid electrolyte interface around the triple-phase interface. Li + paths may be created at non solid electrolyte interface covered regions by the strong current concentration originating from high dielectric constant materials on the cathode. Robust Li + paths lead to excellent chargeability and cyclability.

Original languageEnglish
Pages (from-to)1688-1694
Number of pages7
JournalNano Letters
Volume19
Issue number3
DOIs
Publication statusPublished - Mar 13 2019

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Keywords

  • BaTiO
  • cyclability
  • high-rate chargeability
  • Li-ion battery
  • thin-film battery

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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