Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9760519 | Journal of Power Sources | 2005 | 5 Pages |
Abstract
Lithium-doped natural graphite is synthesized by a simple wet ball-milling method and use as an anode material in lithium secondary batteries. The modified natural graphite is examined with a view to improved cycleability and columbic efficiency on the first charge-discharge cycle (irreversible capacity loss). Lithium-doping results in marked improvements in electrochemical performance. These are investigated by means of X-ray powder diffraction, impedance measurement, high resolution transmission electron microscopy, field emission scanning electron microscopy, and measurement of electrochemical capacity. LiOx intercalated at the edge planes reduces the electrolyte breakdown by passivating the highly reactive sites along these planes. The Li-doped natural graphite exhibits â¼5% reduction in the first irreversible capacity while the reversible capacity remains unchanged in comparison with pristine graphite electrode. Also, it has an excellent capacity retention of â¼99% after 50 cycles.
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Young Tae Lee, Chong Seung Yoon, Yang-Kook Sun,