Abstract
AbstractLi‐ion batteries have to be improved for high‐performance applications especially for automotive application. One aim is the search for new electrode materials with superior properties and their detailed characterization. We used ‘quasi in situ’ X‐ray photoelectron spectroscopy (XPS) to investigate electrode material of the spinel‐type LiCrMnO4 for the cathode during electrochemical cycling. It was found that during charging (de‐intercalation of Li from the cathode) chromium is converted from Cr3+ to Cr6+, whereas manganese changes from Mn4+ to Mn3+. Especially when charging to the maximum capacity (at about 5.2 V), this conversion seems to be partially irreversible. The chemical and structural changes connected with this conversion are the possible reason for the irreversible capacity loss at such high charging voltages, which is confirmed by the analysis of the electrode material after 100 charging/discharging cycles. Copyright © 2010 John Wiley & Sons, Ltd.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
