Abstract
Liquid state soft packed LiFePO4 cathode lithium ion cells with capacity of 2 Ah were fabricated using graphite or Li4Ti5O12 as negative electrodes to investigate the 3 C/10 V overcharge characteristics at room temperature. The LiFePO4/Li4Ti5O12 cell remained safe after the 3 C/10 V overcharge test while the LiFePO4/graphite cell went to thermal runaway. Temperature and voltage variations during overcharge were recorded and analyzed. The cells after overcharge were disassembled to check the changes of the separated cell components. The results showed that the Li4Ti5O12 as anode active material for LiFePO4 cell showed obvious safety advantage compared with the graphite anode. The lithium ionic diffusion models of Li4Ti5O12 anode and graphite anode were built respectively with the help of morphology characterizations performed by scanning electron microscopy. It was found that the different particle shapes and lithium ionic diffusion modes caused different lithium ionic conductivities during overcharge process.
Sign-in/Register to access full text options 
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.
