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Polypyrrole interlayer for Li-S batteries improves cycling performance

A team from CAS Key Laboratory of Materials for Energy Conversion, Shanghai Institute of Ceramics, Chinese Academy of Sciences has designed a novel polypyrrole (an organic polymer) functional interlayer for Li-sulfur batteries to improve cycling performance. The paper is published in the Journal of Power Sources.

Click to enlarge.

They fabricated a polypyrrole functional interlayer uniformly onto the surface of sulfur cathode to inhibit the dissolution of lithium polysulfides and thus to protect the sulfur cathode. The Li–S battery with the functional inlayer shows an encouraging electrochemical performance.

The initial discharge capacity is 719 mAh g−1 and the capacity retains at 846 mAh g−1 even after 200 cycles at 0.2C with an average coulombic efficiency of 94.2%. Moreover, the discharge capacities are 703 mAh g−1 and 533 mAh g−1 at 1C and 2C respectively even after 300 cycles.


  • Guoqiang Ma, Zhaoyin Wen, Jun Jin, Meifen Wu, Xiangwei Wu, Jingchao Zhang (2014) “Enhanced cycle performance of Li–S battery with a polypyrrole functional interlayer,” Journal of Power Sources Vol. 267:542–546, doi: 10.1016/j.jpowsour.2014.05.057



This could lead to a 400+ Wh/Kg commercial lithium battery for future extended range EVs?


Actually, this may be closer to 500Wh/kg, but we have to make some guesses about the nominal operating voltage and a few other items.
I wonder what kind of temperature range it could operate in and the cost for manufacturing something like this.


Electro chemists have been using polypyrrole for a long time, it is an electrically conductive polymer. Some polymers transfer ions and some transfer electrons, this is a natural step in the evolution of lithium sulfur.

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