A Pitaya‐Like Co‐800@KJ Nanocomposite as Separator Coating for High‐Performance Lithium–Sulfur Battery. Issue 7 (9th April 2021)

• Record Type: Journal Article
• Authors: Zhen, Shunying; Huang, Jiaxing; Peng, Lin; Zhang, Mingkun; Shi, Kaiyuan; Ma, Guozheng; Li, Aiju; Wang, Yi
• Is Part Of: Energy technology. Volume 9:Issue 7(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-04-09
• Subjects: lithium–sulfur batteries -- N-doped carbon -- "pitaya" nanostructure -- recessed deposition of Co; Energy development -- Periodicals; Power resources -- Periodicals; 333.79
• DOI: 10.1002/ente.202001017
• Languages: English
• ISSNs: 2194-4288

Abstract

Abstract : Lithium–sulfur (Li–S) batteries serve as an important candidate for next‐generation high energy secondary batteries due to their high specific capacity, low cost, and environmental friendliness. However, the fast capacity fading induced by the polysulfide dissolution and subsequent shuttle effect hinders the application of Li–S batteries. Herein, a "pitaya"‐like Co/C composite is prepared by a simple, rapid, and practical method and applied to Li–S battery coating. A Co‐800@KJ‐modified functional separator is constructed to improve the long‐term cycle stability and rate capability of the pure sulfur cathode. Recessed depositions of Co particles and porous carbon effectively adsorb polysulfide by chemical anchoring and physical immobilization, respectively. Therefore, a stable long‐term cycle ability of 620.5 mAh g −1 after 500 cycles at 0.3 C is realized. Meanwhile, Co embedded in the pores has abundant polysulfide adsorption and catalytic sites, so that the battery also has a capacity of 467.1 mAh g −1 at 4.0 C. Abstract : The application of embedded deposition of Co inside a porous carbon matrix achieves excellent rate capability and cycling stability as an electrocatalyst for the lithium–sulfur (Li–S) system.