In situ impedance analysis on BaTiO3-LiCoO2 composite cathodes for lithium ion batteries

Takasi Teranisi, Yumi Yoshikawa, Ryo Sakuma, Hirokazu Okamura, Hidetaka Hayashi, Akira Kishimoto, Yasuo Takeda

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

In situ electrochemical impedance spectroscopy (EIS) was undertaken to investigate the contribution of a ferroelectric artificial solid electrolyte interface (SEI) to the enhancement of the rate capability of lithium ion batteries. Resistance elements, consisting of the cell reactions, the resistance of the electrolyte, Rsol, that of the Li metal anode reaction, RLi, and the charge transfer resistance, Rct, were measured. A small ferroelectric BaTiO3 (BT) load, ∼1 mol %, notably reduced Rct and Rsol compared with bare LiCoO2 (LC), indicating that loaded ferroelectric BT SEIs effectively promote Li inter/deintercalation into and from the active material, LC, and restrict cobalt ion dissolution into the electrolyte liquid. Lower Rct and Rsol resulted in a significantly higher capacity retention ratio at a 10C rate compared with the initial cycle for small BT load, ∼1 mol %. The capacity retention dropped rapidly, accompanied by a slight increase in Rct for larger BT loads, 5 and 15 mol %, which may be attributed to the thicker BT layer and the existence of the impurity phase, BaCO3. These results imply that the ferroelectric SEI affected the kinetics of mobile Li ions at the cathode-electrolyte interface, significantly enhancing the rate capability.

Original languageEnglish
Article number10NB02
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume54
Issue number10
DOIs
Publication statusPublished - Oct 1 2015

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Ferroelectric materials
electric batteries
Cathodes
lithium
cathodes
solid electrolytes
electrolytes
impedance
composite materials
Electrolytes
Solid electrolytes
Composite materials
ions
Ions
dissolving
anodes
cobalt
Electrochemical impedance spectroscopy
charge transfer
Charge transfer

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

Cite this

In situ impedance analysis on BaTiO3-LiCoO2 composite cathodes for lithium ion batteries. / Teranisi, Takasi; Yoshikawa, Yumi; Sakuma, Ryo; Okamura, Hirokazu; Hayashi, Hidetaka; Kishimoto, Akira; Takeda, Yasuo.

In: Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers, Vol. 54, No. 10, 10NB02, 01.10.2015.

Research output: Contribution to journalArticle

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