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CoO nanoneedle arrays as a multifunctional “super-reservoir” electrode for long cycle life Li-S batteries

Journal of Materials Chemistry A, ISSN: 2050-7496, Vol: 5, Issue: 1, Page: 250-257
2017
  • 154
    Citations
  • 0
    Usage
  • 37
    Captures
  • 0
    Mentions
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Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    154
    • Citation Indexes
      154
  • Captures
    37

Article Description

Lithium-sulfur (Li-S) batteries are highly attractive as energy storage devices due to their low cost and high energy density. The undesired capacity degradation caused by the polysulfide shuttle, however, has hindered their commercialization. Herein, a CoO nanoneedle array on carbon cloth (CC@CoO) nanocomposite has been prepared and demonstrated for the first time as a multifunctional “super-reservoir” electrode to prolong the cycle life of Li-S batteries. Owing to the polar surface of the CoO nanoneedle array, soluble lithium polysulfides (LiS, 4 < n < 8) can be effectively absorbed and then transformed to insoluble LiS/LiS which evenly covers the surface of the CoO nanoneedle during the discharge process. Further, during the charge process, the CoO nanoneedle can catalyze the electrochemical transformation of LiS/LiS into soluble polysulfides. A high initial capacity of 1231 mA h g at 0.5C and a slow capacity decay of 0.049%/cycle at 2.0C over 500 cycles were achieved; excellent rate performance was also obtained.

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