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Title page for etd-0913111-180502


URN etd-0913111-180502 Statistics This thesis had been viewed 2163 times. Download 592 times.
Author Fan Ping Liu
Author's Email Address eric9845@yahoo.com.tw
Department Materials Engineering
Year 2010 Semester 2
Degree Master Type of Document Master's Thesis
Language English Page Count 118
Title Preparation and characterization of Li3V2(1-x)Fe3x(PO4)3 and Li3V2(1-x)Fe2x(PO4)3 cathode materials for lithium-ion batteries
Keyword
  • monoclinic structure
  • Li3V2(PO4)3
  • lithium ion battery
  • cathode
  • cathode
  • lithium ion battery
  • Li3V2(PO4)3
  • monoclinic structure
  • Abstract Li3V2(PO4)3, Li3V2(1-x)Fe3x(PO4)3, and Li3V2(1-x)Fe2x(PO4)3 (0 ≤ x ≤ 0.09) samples had been prepared via a solution method. The elemental compositions, crystal structures, carbon contents, and morphologies of the prepared powders were investigated by ICP-AES, XRD, EA, and SEM, respectively. Furthermore, a micro-FTIR was used to study the surface of Li3V2(PO4)3 electrode before cycling and after 100 cycled, to reveal the formation of passive film on the cycled electrode. From the results of capacity retention study, it is found that partial substitution with Fe can improve the cycling performance of Li3V2(PO4)3 based samples. The powders with composition of Li3V1.86Fe0.21(PO4)3 and Li3V1.86Fe0.02(PO4)3 show the best capacity retention and the highest discharge capacity among the prepared Li3V2(1-x)Fe3x(PO4)3, and Li3V2(1-x)Fe2x(PO4)3 samples, respectively. Li3V1.86Fe0.21(PO4)3 shows second discharge capacity of 141.2 mAh/g and 90.1% retention after 30 cycles at 30oC with 5C rate, whereas Li3V2(PO4)3 shows second discharge capacity of 120.2 mAh/g and dropped to 80.1 mAh/g after 30th cycle at the same C-rate.
    Advisor Committee
  • Huang-She Wu - advisor
  • Chia-Chin Chung - co-chair
  • Hong-Ming Lin - co-chair
  • Jeng-Yu Lin - co-chair
  • Wen-Chang Chen - co-chair
  • Files indicate in-campus access at 2 years and off-campus access at 2 years
    Date of Defense 2011-07-27 Date of Submission 2011-09-13


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