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URN etd-0910115-132139 Statistics This thesis had been viewed 987 times. Download 39 times. Author Shou-huang Su 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 98 Title Effects of crystalline structure on the cycling performance of spinel LiNi0.5Mn1.5O4 cathode materials Keyword cathode materials lithium ion battery lithium ion battery cathode materials Abstract LiNi0.5Mn1.5O4 cathode materials with two different space group (Fd3 ̅-3m and P4332) are synthesized by a spray pyrolysis method followed by heat treatment at 900oC for 8 hours and post annealing at 700oC for various durations (0-96 h). The structure and morphology of the prepared samples are studied with X-ray diffraction (XRD),neutron diffraction(NPD), Raman spectroscopy, scanning electron microscope (SEM), and high resolution transmission microscope. Their electrochemical properties are investigated by cyclic voltammetric and capacity retention studies with coin-type cells comprised with cathodes prepared with the prepared powders. The results of Rietveld refinement with XRD patterns show that the calculated lattice parameter decreases with increasing duration of post annealing, while the results of NPD study manifest that the weight fraction of ordered P4332 phase increases at the same time. From the results of capacity retention study, it can be found that the cell prepared with 900oC heat-treated sample exhibits the most promising cycling performance among the prepared samples. Advisor Committee She-huang Wu - advisor
Lin, Yung-Jen - co-chair
Nae-Lih Wu - co-chair
Files Date of Defense 2015-07-17 Date of Submission 2015-09-11