• 文献标题:   Hydrogen-substituted graphdiyne/graphene as an sp/sp(2) hybridized carbon interlayer for lithium-sulfur batteries
  • 文献类型:   Article
  • 作  者:   KONG SZ, CAI D, LI GF, XU XJ, ZHOU SY, DING XW, ZHANG YQ, YANG S, ZHOU XM, NIE HG, HUANG SM, PENG P, YANG Z
  • 作者关键词:  
  • 出版物名称:   NANOSCALE
  • ISSN:   2040-3364 EI 2040-3372
  • 通讯作者地址:  
  • 被引频次:   14
  • DOI:   10.1039/d0nr07878f
  • 出版年:   2021

▎ 摘  要

To overcome the shuttle effect in lithium-sulfur (Li-S) batteries, an sp/sp(2) hybridized all-carbon interlayer by coating graphene (Gra) and hydrogen-substituted graphdiyne (HsGDY) with a specific surface area as high as 2184 m(2) g(-1) on a cathode is designed and prepared. The two-dimensional network and rich pore structure of HsGDY can enable the fast physical adsorption of lithium polysulfides (LiPSs). In situ Raman spectroscopy and ex situ X-ray photoelectron spectroscopy (XPS) combined with density functional theory (DFT) computations confirm that the acetylenic bonds in HsGDY can trap the Li+ of LiPSs owing to the strong adsorption of Li+ by acetylenic active sites. The strong physical adsorption and chemical anchoring of LiPSs by the HsGDY materials promote the conversion reaction of LiPSs to further mitigate the shuttling problem. As a result, Li-S batteries integrated with the all-carbon interlayers exhibit excellent cycling stability during long-term cycling with an attenuation rate of 0.089% per cycle at 1 C over 500 cycles.