Recent investigations on thin films and single particles of transition metal oxides for lithium batteries

I. Uchida, M. Mohamedi, K. Dokko, M. Nishizawa, T. Itoh, M. Umeda

Research output: Contribution to journalConference article

32 Citations (Scopus)

Abstract

Various aspects in the lithium battery field have been explored in our group: (i) uniform and dense thin films of LiMn2O4 up to 0.5 μm thickness have been synthesized by electrostatic spray deposition (ESD). The electrochemical properties of these films were investigated by cyclic voltammetry and impedance spectroscopy under a variety of experimental conditions. (ii) The kinetic and transport properties of lithium insertion/extraction of numerous sphere-shaped single particles have been also evaluated by transient techniques as well as by ac-impedance spectroscopy. (iii) Electrochemical quartz crystal microbalance (EQCM) technique was employed to study the low capacity fading of LiMn2O4 at elevated temperatures in LiPF6 containing solutions. It has been confirmed that this phenomenon is due to the manganese dissolution promoted by acidic species (HF) originated from the reaction of LiPF6 with water. (iv) Alternative materials were sought to replace the actual LiCoO2 or LiMn2O4. Among them: Li1.1Mn1.9O4, LiNi0.85Co0.15O2 and Li1.10Mn1.852Cr0.048O4. Interestingly, Li1.10Mn1.852Cr0.048O4 exhibited no significant capacity fading even in the 1M LiPF6/PC-EC (1:1) solution at 50°C upon 50 cycles of charge/discharge.

Original languageEnglish
Pages (from-to)518-524
Number of pages7
JournalJournal of Power Sources
Volume97-98
DOIs
Publication statusPublished - 2001 Jul 1
Event10th International Meeting on Lithium Batteries - Como, Italy
Duration: 2001 May 282001 Jun 2

Keywords

  • Lithium battery
  • Microelectrodes
  • Stability
  • Thin films

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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