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Nucleation and phase-boundary movement upon stage transformation in lithium -graphite intercalation compounds were investigated by potential-step chronoamperometry and alternating current impedance spectroscopy. Highly oriented pyrolytic graphite was used as a host graphite material. The current response obtained by potential step was strongly dependent on the kind and direction of stage transformation. A current hump due to the nucleation and nuclear growth of a new stage was observed during the stage transformations from dilute stage 1 to stage 4 and from stage 2 to stage 1 upon lithium intercalation, and from stage 4 to dilute stage 1 upon deintercalation. The rate-determining steps for nucleation and for phase-boundary movement were discussed in the stage transformation between dilute stage 1 and stage 4. It was shown that the nucleation rate was controlled by the reaction at the graphite/electrolyte interface in both directions. The rate of the phase-boundary movement was affected greatly by the diffusivity of lithium ions in a growing phase; that is, it was controlled mainly by the diffusion in stage 4 in the direction from dilute stage 1 to stage 4, whereas by the interfacia

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Author

Atsushi Funabiki; Minoru Inaba; Takeshi Abe; Zempachi Ogumi

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0013-4686)

Published

1999

Language

EN

Field

Engineering (Physical Sciences)