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Title page for etd-0910115-123559


URN etd-0910115-123559 Statistics This thesis had been viewed 700 times. Download 1 times.
Author Bo-Hao Zhou
Author's Email Address No Public.
Department Materials Engineering
Year 2014 Semester 2
Degree Master Type of Document Master's Thesis
Language English Page Count 105
Title Fading mechanism of LiFePO4/MCMB lithium ion battery
Keyword
  • aging mechanism
  • loading ratio
  • lithium ion battery
  • LiFePO4 battery
  • LiFePO4 battery
  • lithium ion battery
  • loading ratio
  • aging mechanism
  • Abstract 500 mAh LiFePO4/MCMB pouch-type cells with various anode to cathode (A/C) loading ratios are prepared for the study. The effects of the loading ratio on the cycling performance are investigated by capacity retention and EIS studies. From the postmortem analysis with XRD, SEM, ATR-FTIR studies for the cycled cathodes and anodes, and the capacity retention and EIS studies for the coin cells assembled with cycled cathodes and anodes, respectively, the mechanism of the capacity fade of the LiFePO4/MCMB cells prepared with various A/C loading ratios are investigated. Lithium plating was found to be the main cause for the capacity loss at A/C ratio lower than 1, while the irreversible lithium loss and Li trapped in voids of anode material cause the capacity lowering at high A/C loading ratio. Furthermore, cells prepared with A/C loading ratios of 0.9 and 1.3 manifest higher charge transfer resistance than that with A/C ratio of 1.1. In addition to the factors, iron loss and severe lithium loss from LiFePO4 accerlate the capacity fade of LiFePO4/MCMB cell upon cycling at 60oC.
    Advisor Committee
  • She-huang Wu - advisor
  • Nae-Lih Wu - co-chair
  • Yung-Jen Lin - co-chair
  • Files indicate in-campus access at 1 years and off-campus access at 30 years
    Date of Defense 2015-07-17 Date of Submission 2015-09-10


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