| 초록 |
A novel nanocomposite cathode consisting of sulfur and hollow-mesoporoustitania (HMT) embedded within carbon nanotubes (CNT), which is designated as S-HMT@CNT, has been obtained by encapsulating elementalsulfur into the pores of hollow-mesoporous, spherical TiO2 particles that areconnected via CNT. A carbon-paper interlayer, referred to as dual functionalporous carbon wall (DF-PCW), has been obtained by filling the voids in TiO2spheres with carbon and then etching the TiO2 template with a chemical process. The DF-PCW interlayer provides a medium for scavenging the lithiumpolysulfides and suppressing them from diffusing to the anode side when itis inserted between the sulfur cathode and the separator. Lithium–sulfur cellsfabricated with the thus prepared S-HMT@CNT cathode and the DF-PCWinterlayer exhibit superior performance due to the containment of sulfur inTiO2 and improved lithium–ion and electron transports. The Li–S cells displayhigh capacity with excellent capacity retention at rates as high as 1C, 2C,and 5C rates. |
