An XRD Study of Chemical Self-Discharge in Delithiated Cobalt Oxide
نویسندگان
چکیده
Changes in samples of Li12xCoO2 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 Li12xCoO2 when it was aged in the presence of LiClO4 , LiPF6 , and LiAsF6 in propylene carbonate ~PC!. Li 1 re-intercalation could account for the reversible capacity loss. Thermal aging at 75°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 . © 2004 The Electrochemical Society. @DOI: 10.1149/1.1830395# All rights reserved.
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