Lithium ion diffusion through glassy carbon plate

Conference · Wed Jul 01 04:00:00 EDT 1998

OSTI ID:20019181

Inaba, M; Nohmi, S; Funabiki, A; Abe, T; Ogumi, Z

The electrochemical permeation method was applied to the determination of the diffusion coefficient of Li{sup +} ion (D{sub Li{sup +}}) in a glassy carbon (GC) plate. The cell was composed of two compartments, which were separated by the GC plate. Li{sup +} ions were inserted electrochemically from one face, and extracted from the other. The flux of the permeated Li{sup +} ions was monitored as an oxidation current at the latter face. The diffusion coefficient was determined by fitting the transient current curve with a theoretical one derived from Fick's law. When the potential was stepped between two potentials in the range of 0 to 0.5 V, transient curves were well fitted with the theoretical one, which gave D{sub Li{sup +}} values on the order of 10{sup {minus}8} cm{sup {minus}2} s{sup {minus}1}. In contrast, when the potential was stepped between two potentials across 0.5 V, significant deviation was observed. The deviation indicated the presence of trap sites as well as diffusion sites for Li{sup +} ions, the former of which is the origin of the irreversible capacity of GC.

• Research Organization: Kyoto Univ., Sakyo (JP)
• OSTI ID: 20019181
• Country of Publication: United States
• Language: English

Related Subjects

25 ENERGY STORAGE
36 MATERIALS SCIENCE
ATOM TRANSPORT
CARBON
CRYSTAL STRUCTURE
DIFFUSION
ELECTROCHEMISTRY
LITHIUM
METAL-NONMETAL BATTERIES
TRAPPING