Single Nickel Atoms on Nitrogen-Doped Graphene Enabling Enhanced Kinetics of Lithium-Sulfur Batteries.

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ID: 22691
2019
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Abstract
Lithium-sulfur (Li-S) batteries have arousing interest because of their high theoretical energy density. However, they often suffer from sluggish conversion of lithium polysulfides (LiPS) during the charge/discharge process. Single nickel (Ni) atoms on nitrogen-doped graphene (Ni@NG) with Ni-N structure are prepared and introduced to modify the separators of Li-S batteries. The oxidized Ni sites of the Ni-N structure act as polysulfide traps, efficiently accommodating polysulfide ion electrons by forming strong S ⋅⋅⋅NiN bonding. Additionally, charge transfer between the LiPS and oxidized Ni sites endows the LiPS on Ni@NG with low free energy and decomposition energy barrier in an electrochemical process, accelerating the kinetic conversion of LiPS during the charge/discharge process. Furthermore, the large binding energy of LiPS on Ni@NG also shows its ability to immobilize the LiPS and further suppresses the undesirable shuttle effect. Therefore, a Li-S battery based on a Ni@NG modified separator exhibits excellent rate performance and stable cycling life with only 0.06% capacity decay per cycle. It affords fresh insights for developing single-atom catalysts to accelerate the kinetic conversion of LiPS for highly stable Li-S batteries.
Reference Key
zhang2019singleadvanced Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Zhang, Linlin;Liu, Daobin;Muhammad, Zahir;Wan, Fang;Xie, Wei;Wang, Yijing;Song, Li;Niu, Zhiqiang;Chen, Jun;
Journal advanced materials (deerfield beach, fla)
Year 2019
DOI
10.1002/adma.201903955
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