Intercalation of lithium ions into graphite electrodes studied by AC impedance measurements

Journal Article · Sun Aug 01 04:00:00 EDT 1999 · Journal of the Electrochemical Society

DOI:https://doi.org/10.1149/1.1392010· OSTI ID:20000084

Piao, T; Park, S M; Doh, C H; Moon, S I

Effects of electrolyte concentrations and the level of preintercalation (x values in Li{sub x}C{sub 6}) on the lithium ion intercalation into graphite lattices have been examined in propylene carbonate-ethylene carbonate mixed solutions with LiClO{sub 4} as an electrolyte by ac impedance measurement techniques. Exchange current densities were determined for reductive intercalation of lithium by ac impedance measurements to range between 1.4 and 2.4 mA/cm{sup 2} depending on the amount of intercalated lithium ions with a transfer coefficient ({alpha}) of 0.65. Diffusion coefficients during the deintercalation process have also been determined at various preintercalation levels. The dependence of diffusion coefficients and exchange currents on the x values in Li{sub x}C{sub 6} (x {le} 1) is discussed.

• Research Organization: Pohang Univ. of Science and Technology (KR)
• OSTI ID: 20000084
• Journal Information: Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 8 Vol. 146; ISSN JESOAN; ISSN 0013-4651
• Country of Publication: United States
• Language: English

Related Subjects

25 ENERGY STORAGE
36 MATERIALS SCIENCE
CLATHRATES
DEPOSITION
ELECTROCHEMISTRY
ELECTRODES
GRAPHITE
IMPEDANCE
LITHIUM
METAL-NONMETAL BATTERIES