Preparation of LiNiO2 and LiMyNi1-yO2 (M = Co,Al) films by electrostatic spray deposition

Kohta Yamada, Nobuaki Sato, Takeo Fujino, Choong G. Lee, Isamu Uchida, Jan R. Selman

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

Syntheses of LiNiO2, LiCo0.5Ni0.5O2, and LiAl0.25Ni0.75O2 as thin films were carried out by electrostatic spray deposition (ESD) onto a gold substrate. Single-phase LiNiO2 film was obtained using a precursor solution of Li(OCOCH3) + Ni(OCOCH3)2/ethanol, and by heating the deposit at 700 °C under an oxygen stream: In the case of cobalt or aluminum doping, Co(NO3)2/ethanol or Al(NO3)3/ethanol were added to the precursor solution in a given ratio. X-ray diffractometry revealed that all films had a crystal structure of space group R3̄m; a = 2.879, c = 14.197 Å for LiNiO2; a = 2.844, c = 14.152 Å for LiCo0.5Ni0.5O2; a = 2.855, c = 14.148 Å for LiAl0.25Ni0.75O2 (in hexagonal setting). Although these products were highly porous, it was observed that the average film thickness of LiNiO2 increased almost proportionally with the deposition time. Electrochemical measurements (cyclic voltammetry, charge/discharge measurement at a constant current) were carried out in organic solutions of LiClO4 (1 mol dm-3 LiClO4/propylene carbonate + ethylene carbonate). The results indicated that thin films fabricated by ESD were electrochemically active for lithium ion extraction/insertion. The effect of cobalt or aluminum doping on the voltammograms is also described.

Original languageEnglish
Pages (from-to)148-153
Number of pages6
JournalJournal of Solid State Electrochemistry
Volume3
Issue number3
DOIs
Publication statusPublished - 1999 Jan 1

Keywords

  • Electrostatic spray deposition
  • Lithium ion secondary battery
  • Lithium nickel dioxide cathode
  • Thin film

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Electrochemistry
  • Electrical and Electronic Engineering

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