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Title page for etd-0818108-165537


URN etd-0818108-165537 Statistics This thesis had been viewed 4088 times. Download 1356 times.
Author Mao-Sung Chen
Author's Email Address maosungchen@gmail.com
Department Materials Engineering
Year 2007 Semester 2
Degree Master Type of Document Master's Thesis
Language English Page Count 73
Title Effects of Al3+ ion substitution of LiFe1-xAlxPO4/ MCMB on the cycle properties and capacity fading mechanism
Keyword
  • capacity fading
  • olivine structure
  • cathode materials
  • cathode materials
  • olivine structure
  • capacity fading
  • Abstract A solution method was used to synthesize LiFePO4 and Al3+-doped LiFe1-xAlxPO4 (0 £ x £ 0.1) powders. After heat-treatment at 700oC for 8 hours under N2 flowing atmosphere, the crystalline structure, compositions, and morphology of the prepared powders were investigated with the XRD patterns performed with 01C beamline of NSRRC of Taiwan, ICP-OES, and SEM. The powder with composition of LiFe0.95Al0.05PO4 shows the best cycling performance at room temperature among the prepared samples. The effects of Al3+-doping on the cycling performance of the LiFePO4/ Li coin-type cells and LiFePO4/ MCMB were investigated. From the cycling results of LiFePO4/ Li cells and the results of GSAS refinement, it was found the reversible capacity of LiFePO4 was increased by Al3+-substitution due to the enlargements of lattice parameter. From the results of capacity retention study for the LiFe1-xAlxPO4/ MCMB stacked cells, the high resolution X-ray image observation, and soaking study, it was revealed that the cycling performance of improvement in LiFe1-xAlxPO4/ MCMB cells by Al3+-substitution was attributed to the suppression of Fe2+-dissolution into LiPF6 electrolyte.
    Advisor Committee
  • Hong-Ming Lin - advisor
  • She-Huang Wu - advisor
  • Ru-Shi Liu - co-chair
  • Wen-Chang Chen - co-chair
  • Files indicate accessible at a year
    Date of Defense 2008-07-15 Date of Submission 2008-08-21


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