A Synergistic Strategy with 3D Highly Conductive Carbon Matrix‐Decorated with Low Loading of CdS Quantum Dots as a Sulfur Host for Advanced Li−S Batteries. Issue 9 (4th May 2021)

• Record Type: Journal Article
• Authors: Li, Yangping; Xu, Jie; Xu, Da; He, Yun; Sun, Xinyi; Niu, Dongfang; Zhang, Xinsheng
• Is Part Of: ChemElectroChem. Volume 8:Issue 9(2021)
• Page Start: 1642
• Page End: 1652
• Publication Date: 2021-05-04
• Subjects: synergistic combination -- high conductivity -- porous structure -- electrocatalysis -- lithium-sulfur batteries; Electrochemistry -- Periodicals; 541.37
• DOI: 10.1002/celc.202100297
• Languages: English
• ISSNs: 2196-0216

Abstract

Abstract: Lithium‐sulfur batteries (LSBs) have become one of the most competitive candidates for next generation energy storage systems due to the high theoretical energy density, nevertheless, the severe shuttle effect, volume expansion, and poor electrical conductivity restrict their practical application. Herein, we report a synergistic combination of 3D carbon matrix (CdS@NG‐CNT) composed of low‐defect carbon nanotubes (CNTs) and nitrogen‐doped graphene (NG) decorated with low loading of cadmium sulfide quantum dots as sulfur host and carbon black (CB) as separator layer to collectively solve these issues. Specifically, the developed host material possesses abundant macropores and mesopores and high electrical conductivity, which endow the carbon matrix multifaceted structural properties for polysulfides immobilization, electrons/Li + transfer, and Li2 S formation, as well as buffering the volume expansion during cycling. The CB‐modified separator can help to enhance the interconversion of intercepted polysulfides. Benefiting from these aspects, the cell equipped with CdS@NG‐CNT/S//CB‐PP exhibits a superior rate capacity of 1493.6 mA h/g at 0.2 C (1 st ), and maintains a capacity of 479.7 mA h/g after 1050 cycles with an ultralow capacity decay rate of 0.051 % at 1.0 C. This work provides a useful strategy to solve issues of the current LSBs, which may practically be used in the high‐energy density. Abstract : Power team : The synergistic combination of CdS@NG‐CNT/S cathode and carbon black (CB)‐modified separator was successfully designed to achieve high sulfur utilization and long‐term cycling stability for the advanced lithium‐sulfur batteries.