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Integrated Design of Interlayer/Current‐Collector: Heteronanowires Decorated Carbon Microtube Fabric for High‐Loading and Lean‐Electrolyte Lithium–Sulfur Batteries
Author(s) -
Li Narui,
Yu Lihong,
Xi Jingyu
Publication year - 2021
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.202103001
Subject(s) - sulfur , tin , electrolyte , cathode , materials science , separator (oil production) , current collector , redox , chemical engineering , carbonization , polysulfide , carbon fibers , lithium (medication) , lithium–sulfur battery , inorganic chemistry , chemistry , composite material , electrode , metallurgy , scanning electron microscope , composite number , engineering , thermodynamics , endocrinology , medicine , physics
Low sulfur loading, high electrolyte/sulfur (E/S) ratio, and sluggish sulfur redox reaction are the main challenges that severely impede the practical application of lithium–sulfur batteries (LSBs). To address these problems, a self‐standing hollow carbonized cotton cloth (CCC) decorated with TiO 2 ‐TiN heteronanowires (CCC@TiO 2 ‐TiN) is proposed to replace the traditional cathode. Concretely, one side of CCC@TiO 2 ‐TiN serves as a current‐collector to load sulfur (CCC@TiO 2 ‐TiN/S), while the other side facing the separator acts as interlayer to inhibit shuttle effect. This advanced intergrated interlayer/current‐collector cathode is endowed with excellent 3D electron/ion transportation, a strong confinement barrier, and vast sulfur loading sites. Moreover, the as‐developed TiO 2 ‐TiN heteronanowires work as in situ capture and catalysis sites for the reversible and accelerated sulfur redox reaction. Therefore, the intergrated cathode of CCC@TiO 2 ‐TiN/S achieves an ultrahigh sulfur loading of 13 mg cm −2 and delivers a superb areal capacity of 9.09 mAh cm −2 under the ultralow E/S ratio of 4.6 µL mg −1 . This work provides a new model material to achieve high sulfur loading and lean‐electrolyte toward the practical LSBs with high specific energy density.