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URN etd-0913111-180502 Statistics This thesis had been viewed 2419 times. Download 592 times. Author Fan Ping Liu Author's Email Address email@example.com 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 Date of Defense 2011-07-27 Date of Submission 2011-09-13