Title page for etd-0625117-120642


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URN etd-0625117-120642
Author Tsung-Chieh Kuo
Author's Email Address No Public.
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Department Chemistry
Year 2016
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Nanofiber electrolytes of Single-Ion Conductors for lithium battery
Date of Defense 2017-06-23
Page Count 81
Keyword
  • lithium-ion batteries
  • nanofibers
  • single-ion conductor electrolyte
  • electrospinning
  • polymer electrolyte
  • Abstract In this study, a nonwoven nanofabric single-ion conducting electrolyte (SICE) membrane exhibiting excellent electrochemical performance in ambient environment has been fabricated. Compared to commercial polypropylene separators, the SICE membrane, fabricated via electrospinning of the hybrid solution containing lithium poly[4-styrenesulfonyl(phenylsulfonyl)imide] and polyacrylonitrile, possesses excellent solvation characteristics due to porous morphology that facilitates transportation of lithium ions. It shows superior ionic conductivity of 3.9 × 10−3 S cm−1 and a broader electrochemical window of up to 5.2 V (vs. Li/Li+) with a lithium transference number (t_(〖Li〗^+ )) of 0.93 at 30 °C under ethylene carbonate/propylene carbonate/diethyl carbonate (=3/2/5, v/v/v) solvent system. Furthermore, fabricated with this SICE membrane, the lithium ion batteries made from LiFePO4 cathode demonstrate not only a discharge capacity of 163 mAh/g at 0.2 and 0.5 C, which is the highest value reported so far for SICEs (95.9% of the theoretical capacity of LiFePO4) but also higher discharge capacities up to 2 C in comparison with the commercial separator/dual-ion salt electrolyte system. Those encouraging results with this innovative approach indicate this might be a potential candidate for the design and fabrication techniques of commercial electrolyte membranes in future.
    Advisory Committee
  • Jen-Chieh Hsieh - chair
  • Ming-Li Tsai - co-chair
  • Jyh-Tsung Lee - advisor
  • Files
  • etd-0625117-120642.pdf
  • Indicate in-campus at 5 year and off-campus access at 5 year.
    Date of Submission 2017-07-25

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