Title page for etd-0831112-101541


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URN etd-0831112-101541
Author Jing-Heng Lin
Author's Email Address No Public.
Statistics This thesis had been viewed 5570 times. Download 1084 times.
Department Chemistry
Year 2011
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Electrochemical performance of LiFePO4 cathode with dinitrile-based electrolytes
Date of Defense 2012-07-24
Page Count 130
Keyword
  • nitrile
  • dinitrile
  • high-voltage
  • electrolyte
  • Abstract In this thesis, high-voltage nitrile-based electrolytes for lithium ion batteries were investigated. The electrolytes were composed of nitrile, dinitrile, and vinylene carbonate (VC) as an additive. Scanning electron microscopy showed the change of surface morphology of electrodes. The chemical compositions of the solid electrolyte interface were characterized by high resolution X-ray photo electron spectroscopy (HR-XPS). We found that the optimal ratio of dinitrile to nitrile is 6 to 4 by volume in terms of electrochemical performances. 5wt% VC as the additive has the enhanced electrochemical performances. The oxidation potential of the nitrile-based electrolytes can reach to 5.7 V. The discharge capacity of the Li||LiFePO4 cell with the nitrile-based electrolyte is about 80 mAhg-1 at a charge/discharge rate of 5 C under 30 oC, and its discharge efficiency after 100 cycles still keeps 94.35%.
    Advisory Committee
  • Chi-Wi Ong - chair
  • Mao-Sung Wu - co-chair
  • Jyh-Tsung Lee - advisor
  • Files
  • etd-0831112-101541.pdf
  • Indicate in-campus at 3 year and off-campus access at 3 year.
    Date of Submission 2012-08-31

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