Co-Co9S8-NC particles anchored on 3D hyperfine carbon nanofiber networks with a hierarchical structure as a catalyst promoting polysulfide conversion for lithium–sulfur batteries. Issue 10 (7th February 2023)

• Record Type: Journal Article
• Authors: Gao, Ning; Shen, Xuetao; Liu, Yifan; Xu, Zhanwei; Wang, Xi; Liu, Hangyu; Ren, Yuchuan; Chen, Siyu; Li, Zhi
• Is Part Of: Journal of materials chemistry. Volume 11:Issue 10(2023)
• Page Start: 5212
• Page End: 5221
• Publication Date: 2023-02-07
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d2ta09323e
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : The shuttle effect of lithium polysulfides has been an important factor limiting the practical application of lithium–sulfur batteries. CNF/Co-Co9 S8 -NC composites with a 3D hierarchical structure were prepared as the polysulfide electrocatalyst. Abstract : The shuttle effect of lithium polysulfides (LiPSs) has been an important factor limiting the practical application of lithium–sulfur (Li–S) batteries. To inhibit the shuttle effect and accelerate the conversion of LiPSs to Li2 S, Co-Co9 S8 -nitrogen-doped carbon (NC) particles anchored on 3D hyperfine carbon nanofiber networks with a hierarchical structure (CNF/Co-Co9 S8 -NC) were prepared to modify the Li-S battery separator. In our work, ZIF-67-derived Co-Co9 S8 -NC particles were anchored on 3D CNF networks derived from bacterial celluloses. CNF networks can provide a highly conductive channel for the transport of ions and electrons, and the 3D structural networks also limit the shuttle of LiPSs to a certain extent, while Co-Co9 S8 -NC particles, as a highly efficient adsorbent and catalyst for LiPSs, can accelerate the reaction kinetics effectively. Based on the dual limiting effect, the Li–S battery with the CNF/Co-Co9 S8 -NC modified separator exhibits excellent electrochemical performance. It exhibits a high initial specific capacity of 1582 mA h g −1 at 0.1 C. Besides, a high reversible discharge capacity of 560.1 mA h g −1 is obtained over 300 cycles at 2 C with 0.083% decay per cycle. This work shows a novel method for the preparation of heterostructure materials anchored on 3D carbon networks for high-performance Li–S batteries.