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Electrochemical insertion of Li and irreversibility in disordered carbons prepared from oxygen and sulfur-containing pitches by D. Larcher; C. Mudalige; M. Gharghouri; J.R. Dahn is a Engineering article available to read on EtoBox.

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Starting from pitches with oxygen and sulfur contents varying from 0.13 to 2.7% by weight, we prepared a series of pregraphitic carbons by pyrolysis at 10008C. The presence of O and S has no apparent physical or structural eect on the ®nal carbon. However, a direct link was found between oxygen and sulfur contents and the irreversible capacity of the electrochemical reaction of Li with these carbons. Apparently Li reacts irreversibly with sulfur and oxygen to form Li±O and Li±S bonds as are found in Li 2 O and Li 2 S. According to this model, the irreversible capacity should be directly proportional to the chalcogen content, and this is approximately observed at high chalcogen content. For lower concentrations, the formation of the solid electrolyte interphase (SEI) is the dominant cause of Li loss.

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Author

D. Larcher; C. Mudalige; M. Gharghouri; J.R. Dahn

Publisher

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

Published

1999

Language

EN

Field

Engineering (Physical Sciences)