Cyclic performances of HT-LiCo0.8M0.2O2 (M = Al, Ni) powders prepared by the molten salt synthesis method

Chi Hwan Han, Young Sik Hong, Keon Kim

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

Single phases of M-substituted lithium cobalt oxides, HT-LiCo0.8M0.2O2 (M = Al, Ni), were prepared by molten salt synthesis (MSS) method using coprecipitated Co-M hydroxides in 0.59 LiNO3-0.41 LiOH. The prepared powders consisted of well-developed particles with spherical shape and the particle size was around 150 nm in diameter. Among them, HT-LiCo0.8Al0.2O2 showed an inferior cyclic performance and a smaller discharge capacity than HT-LiCo0.8Ni0.2O2, even though the former is more structurally stable than the latter. Structural analysis of HT-LixCo0.8Al0.2O2 indicated that the Al substitution, causing an enhanced internal resistance for lithium ion diffusion, is responsible for the capacity fading. In the meanwhile, HT-LixCo0.8Ni0.2O2 with large c layer spacing showed as high as 146 mAh/g at the first cycle and 130 mAh/g at the twentieth cycle.

Original languageEnglish
Pages (from-to)241-247
Number of pages7
JournalSolid State Ionics
Volume159
Issue number3-4
DOIs
Publication statusPublished - 2003 Apr 1

Fingerprint

Hydroxides
molten salts
Lithium
Structural analysis
Powders
Molten materials
Substitution reactions
Salts
Particle size
Ions
lithium oxides
cycles
cobalt oxides
fading
synthesis
structural analysis
hydroxides
Cobalt
lithium
spacing

Keywords

  • LiCoAlO
  • LiCoNi O
  • Lithium ion battery
  • Molten salt

ASJC Scopus subject areas

  • Electrochemistry
  • Physical and Theoretical Chemistry
  • Energy Engineering and Power Technology
  • Materials Chemistry
  • Condensed Matter Physics

Cite this

Cyclic performances of HT-LiCo0.8M0.2O2 (M = Al, Ni) powders prepared by the molten salt synthesis method. / Han, Chi Hwan; Hong, Young Sik; Kim, Keon.

In: Solid State Ionics, Vol. 159, No. 3-4, 01.04.2003, p. 241-247.

Research output: Contribution to journalArticle

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AB - Single phases of M-substituted lithium cobalt oxides, HT-LiCo0.8M0.2O2 (M = Al, Ni), were prepared by molten salt synthesis (MSS) method using coprecipitated Co-M hydroxides in 0.59 LiNO3-0.41 LiOH. The prepared powders consisted of well-developed particles with spherical shape and the particle size was around 150 nm in diameter. Among them, HT-LiCo0.8Al0.2O2 showed an inferior cyclic performance and a smaller discharge capacity than HT-LiCo0.8Ni0.2O2, even though the former is more structurally stable than the latter. Structural analysis of HT-LixCo0.8Al0.2O2 indicated that the Al substitution, causing an enhanced internal resistance for lithium ion diffusion, is responsible for the capacity fading. In the meanwhile, HT-LixCo0.8Ni0.2O2 with large c layer spacing showed as high as 146 mAh/g at the first cycle and 130 mAh/g at the twentieth cycle.

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