Small capacity decay of lithium iron phosphate (LiFePO4) synthesized continuously in supercritical water

Comparison with solid-state method

Seung Ah Hong, Su Jin Kim, Jaehoon Kim, Kyung Yoon Chung, Byung Won Cho, Jeong Won Kang

Research output: Contribution to journalArticle

40 Citations (Scopus)

Abstract

Nanosize lithium iron phosphate (LiFePO4) particles are synthesized using a continuous supercritical hydrothermal synthesis method at 25 MPa and 400 °C under various flow rates. The properties of LiFePO 4 synthesized in supercritical water including purity, crystallinity, atomic composition, particle size, surface area and thermal stability are compared with those of particles synthesized using a conventional solid-state method. Smaller size particles ranging 200-800 nm, higher BET surface area ranging 6.3-15.9 m2 g-1 and higher crystallinity are produced in supercritical water compared to those of the solid-state synthesized particles (3-15 μm; 2.4 m2 g-1). LiFePO4 synthesized in supercritical water exhibit higher discharge capacity of 70-80 mAh g-1 at 0.1 C after 30 cycles than that of the solid-state synthesized LiFePO4 (60 mAh g-1), which is attributed to the smaller size particles and the higher crystallinity. Smaller capacity decay at from 135 to 125 mAh g-1 is observed during the 30 cycles in carbon-coated LiFePO4 synthesized using supercritical water while rapid capacity decay from 158 to 140 mAh g-1 is observed in the carbon-coated LiFePO4 synthesized using the solid-state method.

Original languageEnglish
Pages (from-to)1027-1037
Number of pages11
JournalJournal of Supercritical Fluids
Volume55
Issue number3
DOIs
Publication statusPublished - 2011 Jan 1

Fingerprint

Lithium
phosphates
Phosphates
Iron
lithium
solid state
iron
Water
Particle size
decay
water
crystallinity
Carbon
Hydrothermal synthesis
cycles
Thermodynamic stability
carbon
Flow rate
LiFePO4
purity

Keywords

  • Cathode active material
  • Lithium iron phosphate
  • Solid-state method
  • Supercritical hydrothermal synthesis

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Chemical Engineering(all)
  • Condensed Matter Physics

Cite this

Small capacity decay of lithium iron phosphate (LiFePO4) synthesized continuously in supercritical water : Comparison with solid-state method. / Hong, Seung Ah; Kim, Su Jin; Kim, Jaehoon; Chung, Kyung Yoon; Cho, Byung Won; Kang, Jeong Won.

In: Journal of Supercritical Fluids, Vol. 55, No. 3, 01.01.2011, p. 1027-1037.

Research output: Contribution to journalArticle

Hong, Seung Ah ; Kim, Su Jin ; Kim, Jaehoon ; Chung, Kyung Yoon ; Cho, Byung Won ; Kang, Jeong Won. / Small capacity decay of lithium iron phosphate (LiFePO4) synthesized continuously in supercritical water : Comparison with solid-state method. In: Journal of Supercritical Fluids. 2011 ; Vol. 55, No. 3. pp. 1027-1037.
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