A robust 2D organic polysulfane nanosheet with grafted polycyclic sulfur for highly reversible and durable lithium-organosulfur batteries

摘要: Abstract Organic polysulfanes are new type of attractive organosulfur electrode materials for next generation lithium-sulfur (Li-S) batteries because their high sulfur content, low cost, and desirable energy density. However, conventional organic usually suffer from poor reversibility due to structure variation irreversible conversion during cycling. Here we report the synthesis characterization a novel two-dimensional (2D) polysulfane with unique molecular polycyclic directly substituting carboxyls poly(acrylic acid) grafted on carbon chain through coupling reaction KI as catalyst KCl template. The obtained nanosheets 72 wt% (OPNS-72) exhibit initial capacity 891 mAh/g (based whole composite), excellent cycling stability (0.014% fading per cycle over 620 cycles at 1 C rate), superior rate capability (562 10 C) mass loading 9.7 mg/cm2. remarkable Li-S battery is attributed structural highly reversible electrochemical OPNS-72 electrode, confirmed by TEM image after operando Raman spectroscopy measurements under operating conditions. Further, developed approach applicable preparation other electrodes batteries.