期刊
CHEMISTRY OF MATERIALS
卷 24, 期 15, 页码 3081-3087出版社
AMER CHEMICAL SOC
DOI: 10.1021/cm301661y
关键词
rechargeable lithium-sulfur battery; mixed ionic-electronic conductor; polymer acid-doped polypyrrole; electrochemical performance; cyclability
资金
- Seven One Limited
A mixed ionic electronic conductor (MIEC) of polypyrrole (PPy) synthesized with poly(2-acrylamido-2-methyl-1-propanesulfonic acid) (PAAMPSA), which is water-dispersible and is in the form of nanoparticles intertwined by the PAAMPSA, is explored as an additive in sulfur cathodes for rechargeable lithium sulfur (Li-S) batteries. A S-MIEC composite containing a sulfur content of 75 wt % was synthesized by an in situ deposition of sulfur with MIEC. The sulfur retains an orthorhombic phase randomly mixed with MIEC nanoparticles, exhibiting a lower thermal decomposition temperature than the pristine sulfur. Cathodes containing the S-MIEC composite were prepared and evaluated in half cells by cyclic voltammetry and galvanostatic cycling. The S-MIEC composite cathode shows excellent electrochemical stability as the MIEC facilitates ion and electron transfer and capture intermediate polysulfides within the electrodes. The MIEC in the composite electrodes forms a porous, 3D heterostructure providing good electrochemical contact upon cycling as indicated by scanning electron microscopy and electrochemical impedance spectroscopy. The sulfur in the S-MIEC composite retains a capacity of >600 mA h g(-1) at low rates and SOO mA h g(-1) at 1C after 50 cycles.
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