High‐Energy,High‐Rate,Lithium–Sulfur Batteries: Synergetic Effect of Hollow TiO2‐Webbed Carbon Nanotubes and a Dual Functional Carbon‐Paper Interlayer |
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| Authors: | Jang‐Yeon Hwang Hee Min Kim Sang‐Kyu Lee Joo‐Hyeong Lee Ali Abouimrane Mohammad Ahmed Khaleel Ilias Belharouak Arumugam Manthiram Yang‐Kook Sun |
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| Affiliation: | 1. Department of Energy Engineering, Hanyang University, Seoul, South Korea;2. Qatar Environment and Energy Research Institute, HBKU, Qatar Foundation, Doha, Qatar;3. College of Science and Engineering, HBKU, Qatar Foundation, Doha, Qatar;4. Materials Science and Engineering Program and Texas Materials Institute, The University of Texas at Austin, Austin, TX, USA |
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| Abstract: | A novel nanocomposite cathode consisting of sulfur and hollow‐mesoporous titania (HMT) embedded within carbon nanotubes (CNT), which is designated as S‐HMT@CNT, has been obtained by encapsulating elemental sulfur into the pores of hollow‐mesoporous, spherical TiO2 particles that are connected via CNT. A carbon‐paper interlayer, referred to as dual functional porous carbon wall (DF‐PCW), has been obtained by filling the voids in TiO2 spheres with carbon and then etching the TiO2 template with a chemical process. The DF‐PCW interlayer provides a medium for scavenging the lithium polysulfides and suppressing them from diffusing to the anode side when it is inserted between the sulfur cathode and the separator. Lithium–sulfur cells fabricated with the thus prepared S‐HMT@CNT cathode and the DF‐PCW interlayer exhibit superior performance due to the containment of sulfur in TiO2 and improved lithium–ion and electron transports. The Li–S cells display high capacity with excellent capacity retention at rates as high as 1C, 2C, and 5C rates. |
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| Keywords: | high power interlayer lithium– sulfur batteries porous carbon titanium dioxide |
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