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URN etd-0216117-110917 Statistics This thesis had been viewed 724 times. Download 0 times. Author Hao-Ting Peng Author's Email Address No Public. Department Chemical Engineering Year 2016 Semester 1 Degree Master Type of Document Master's Thesis Language zh-TW.Big5 Chinese Page Count 100 Title Li4Ti5O12/C composite anode materials for lithium-ion batteries Keyword Lithium-ion batteries Lithium-ion batteries Abstract In this study, Li4Ti5O12/C composites were successfully synthesized via one step (LTO/C-O) and two step (LTO/C-3T) route, in which citric acid was used as carbon source. The structure, surface morphology and composition were characterized by X-ray diffraction, scanning electronic microscopy, Raman scattering spectroscopy, and transmission electron microscopy. The electrochemical properties of the samples were examined by using the charge/discharge tests, and electrochemical impedance spectroscopy. It was found that one step method (LTO/C-O) can reduced the particle size and uniformly coated carbon layer compared with two step method (LTO/C-T). The discharge capacity retention of LTO/C-3O sample at 1, 5, 10 and 20 C compared to the 0.1C delivered 95.9 %、90.9 %、87.9 % and 80.9 %，In contrast, LTO/C-3T sample only delivered 94.7 %、79.9 %、68.2 % and 50.1 %. However, the excess amount of carbon did not effectively improve the electronic conductivity, ascribing the presence of Ti4+/Ti3+ mixed valence decreased within LTO/C-O and LTO/C-T samples. The discharge capacity retention of LTO/C-7O sample at 1, 5, 10 and 20 C compared to the 0.1C only delivered 94 %、82.5 %、72.2 % and 52.6 %, which is lower than that of LTO/C-3O sample. Advisor Committee Jeng-Yu Lin - advisor
Chien-Min Chang - co-chair
Yi Hu - co-chair
Files Date of Defense 2017-01-20 Date of Submission 2017-02-16