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Highly Stable Lithium–Sulfur Batteries Achieved by a SnS/Porous Carbon Nanosheet Architecture Modified Celgard Separator
Author(s) -
Li Zhi,
Zhang Fan,
Cao Tong,
Tang Linbin,
Xu Qunjie,
Liu Haimei,
Wang Yonggang
Publication year - 2020
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.202006297
Subject(s) - nanosheet , materials science , redox , separator (oil production) , chemical engineering , sulfur , electrochemistry , nucleation , adsorption , energy storage , nanotechnology , electrode , organic chemistry , chemistry , metallurgy , power (physics) , physics , quantum mechanics , engineering , thermodynamics
Lithium‐sulfur batteries (LSB) are one of the potential candidates for the next generation of electrochemical energy storage technology, due to their advantages of high theoretical capacity and high energy density. However, sluggish redox kinetics and the shuttle effect of polysulfides in the cyclic process lead to low sulfur utilization, severe polarization and poor cyclic stability. Herein, an SnS modified porous carbon nanosheet (SnS/PCNS) hybrid material is synthesized by a simple hydrothermal method and used to modify the separator of the LSB for the first time. Specifically, SnS/PCNS can not only adsorb polysulfides, but also enhance the redox reaction of polysulfides. In addition, SnS/PCNS are shown to promote rapid nucleation and uniform deposition of Li 2 S, and to improve the discharge capacity and heighten cyclic stability. The initial capacity is 1270 mAh g −1 at 0.5 C, the slow decay rate of each cycle is 0.039% at 1 C. When the sulfur loading is improved to 6 mg cm −2 , the high reversible capacity is 955.3 mAh g −1 at 0.5 C. As a new polysulfides adsorbent, SnS provides a potential route for the commercialization of LSBs.