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.
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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