Journal
ELECTROCHEMICAL AND SOLID STATE LETTERS
Volume 8, Issue 1, Pages A38-A41Publisher
ELECTROCHEMICAL SOC INC
DOI: 10.1149/1.1830395
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Changes in samples of Li1-xCoO2 were measured by X-ray diffractometry (XRD) after thermal aging treatments that cause capacity losses in electrochemical cells. Changes in lattice parameters were used to identify lithium re-intercalation into Li1-xCoO2 when it was aged in the presence of LiClO4, LiPF6, and LiAsF6 in propylene carbonate (PC). Li+ re-intercalation could account for the reversible capacity loss. Thermal aging at 75 degrees C in pure PC or pure argon gas resulted in other changes that are attributed to the formation of spinel phase. The rate of the lithium re-intercalation increases in the following sequence: LiPF6 < LiClO4 < LiAsF6. (C) 2004 The Electrochemical Society.
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