Title page for etd-0626116-104951


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URN etd-0626116-104951
Author Ho-xin Yen
Author's Email Address hoxinyen@gmail.com
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Department Chemistry
Year 2015
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Hydrothermal synthesis of lithium iron phosphate using ferrocenecarboxylic acid as iron source
Date of Defense 2016-07-18
Page Count 78
Keyword
  • Lithium iron phosphate
  • Ferrocenecatboxylic acid
  • Cathode material
  • Hydrothermal
  • Li-ion battery
  • Abstract This thesis is to develop a simple and facile approach for hydrothermal synthesis of LiFePO4. Without reducing agent, we have successfully synthesized LiFePO4 using ferrocenecarboxylic acid as an iron source in the air atmosphere. The X-ray diffraction (XRD) pattern results demonstrate that LiFePO4 powders have an orthorhombic olivine-type structure with a space group of Pnma. The observation of scanning electron microscopy (SEM) shows that resulting LiFePO4 particle with a size of 1 μm. The surface morphology, size, and crystal orientation of the LiFePO4 powders were also confirmed by transmission electron microscopy (TEM). The chemical composition of the LiFePO4 powders was characterized by elemental analysis (EA). Furthermore, the LiFePO4 cathode-active materials was fabricated as LiFePO4 composite electrodes to measure their electrochemical properties and cell performances. The results of cyclic voltammetry (CV) shows a redox couple at 3.5 V vs. Li/Li+ with excellent electrochemical reversibility. The impedance and lithium diffusion of the Li|| LiFePO4 cell were measured by AC-impedance. The discharge capacity of the cell is 159 mAh/g at a discharge rate of 0.1C, which is very close the theoretical energy capacity LiFePO4 (170 mAh/g). The cell also exhibits good cycle-life performance.
    Advisory Committee
  • Chien-Chung Han - chair
  • Mao-Sung Wu - co-chair
  • Jyh-Tsung Lee - advisor
  • Files
  • etd-0626116-104951.pdf
  • Indicate in-campus at 5 year and off-campus access at 5 year.
    Date of Submission 2016-08-04

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