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Title page for etd-0715104-102050


URN etd-0715104-102050 Statistics This thesis had been viewed 1541 times. Download 16 times.
Author Chi-Wei Yang
Author's Email Address tyang89@hotmail.com
Department Materials Engineering
Year 2003 Semester 2
Degree Master Type of Document Master's Thesis
Language English Page Count 107
Title The Preparation and Characterization of LiNi0.8Co0.2O2 via a Novel Co-Precipitation
Keyword
  • lithium battery
  • cathode material
  • cathode material
  • lithium battery
  • Abstract Abstract
    LiNi0.8Co0.2-xAlxO2 (0 ≤ x ≤ 0.1) cathode powders were prepared with a novel co-precipitation method by heat-treating at temperatures between 700 and 900oC. The electrochemical properties as cathode material for lithium batteries were predict with XRD patterns and examine with cyclic voltammetry and capacity retention studies. Among the prepared samples, 800oC heat-treated un-substituted LiNi0.8Co0.2O2 sample shows the best cycling performance. It is the Li+ diffusion in the cathode material that causes the decreasing cycling performance by Al-substitution. That was proved with the EIS results that the apparent diffusion coefficient decreases with increasing amount of Al-substitution. The diminishing by Al-substitution may be attributed to the occupancy of Al3+ at the interstitial hexagonal 6c site that will hinder the diffusion of Li+ ion. Nevertheless, Al-substitution can improve the thermal stability effectively.
    Advisor Committee
  • She-Haung Wu - advisor
  • Chung Hsi Lu - co-chair
  • Mu-Rong Yang - co-chair
  • Yung-Jen Lin - co-chair
  • Files indicate in-campus access only
    Date of Defense 2004-06-15 Date of Submission 2004-07-15


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