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URN etd-0830114-101401 Statistics This thesis had been viewed 653 times. Download 55 times. Author Tsun-sheng Chou Author's Email Address email@example.com Department Materials Engineering Year 2013 Semester 2 Degree Master Type of Document Master's Thesis Language Chinese&English Page Count 92 Title Effects of Cr-substitution on crystalline structure and electrochemical properties of the LiMnO2 cathode materials Keyword cathode materials Lithium ion batteries Cr-substituted LiMnO2 Cr-substituted LiMnO2 Lithium ion batteries cathode materials Abstract The orthorhombic LiMnO2 and Cr-substituted LiMn1-xCrxO2 (x = 0 ~ 0.15) compounds are prepared via a Pechini’s method. The crystallographies of the prepared samples are investigated by the means of XRD, SEM, TEM, and Rietveld refinement ver. 2.1.1. From results, it is found that some monoclinic structure appeared in company with orthorhombic phase when Mn was substituted by a small amount of Cr (x < 0.05). With increasing of Cr-substitution lead to a crystalline structure change from orthorhombic to monoclinic and become monoclinic when x = 0.05. The average particle size decreases and uniformity increases, while the specific capacity also increases with amount of Cr-substitution. Among the prepared powders, sample prepared with x = 0.1 manifests the most promising electrochemical properties. The lowering in specific capacity in sample prepared with x = 0.15 may be attributed to the formation of LiCrO2. Advisor Committee Shu-huang Wu - advisor
Nae-Lih Wu - co-chair
Yung-Jen Lin - co-chair
Files Date of Defense 2014-07-30 Date of Submission 2014-09-01