Title page for etd-0625117-115831


[Back to Results | New Search]

URN etd-0625117-115831
Author Chang-Ju Hsieh
Author's Email Address No Public.
Statistics This thesis had been viewed 5336 times. Download 0 times.
Department Chemistry
Year 2016
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Formation mechanism of porous spheres and their applications in lithium-sulfur battery
Date of Defense 2017-06-20
Page Count 106
Keyword
  • porous carbon spheres
  • cathode materials
  • conductive polymers
  • lithium polysulfides
  • lithium-sulfur battery
  • Abstract Lithium-sulfur batteries are considered a great prospect for energy storage purpose, courtesy to high theoretical specific capacity of sulfur (1672 mAh/g). However, due to shuttling effect of lithium polysulfides, these batteries show poor cycle life. In this study, to improve the performance, conductive polymers and porous carbon spheres are used. While the nitrogen atom of conductive polymers can bind polysulfides during charging and discharging, the porous carbon spheres with high quality of morphologies can provide better space to improve poor conductivity and expansion of sulfur. Higher capacity and better cycle life are achieved by the synergic effect of both the materials as it increases the utilization of sulfur and prevents the dissolution of polysulfides in the electrolyte. The sulfur-conductive polymers/porous carbon spheres composite material is characterized by infrared spectroscopy and scanning electron microscope. The sulfur content is quantified by thermogravimetric analysis. Electrochemical measurements show a better discharge capacity for the synthesized composite electrode (1234 mAh/g) compared to the blank sulfur composite electrode (1110 mAh/g), at a 0.05C- discharging rate. The cycle life of the composite electrode is also better than that of the blank. The results demonstrate that the composite electrode material can improve the performance of lithium-sulfur battery.
    Advisory Committee
  • Wu Mao-Sung - chair
  • Tsai Ming-Li - co-chair
  • Lee Jyh-Tsung - advisor
  • Files
  • etd-0625117-115831.pdf
  • Indicate in-campus at 5 year and off-campus access at 5 year.
    Date of Submission 2017-07-25

    [Back to Results | New Search]


    Browse | Search All Available ETDs

    If you have more questions or technical problems, please contact eThesys