In:
Energy Technology, Wiley, Vol. 7, No. 5 ( 2019-05)
Abstract:
Chemically and mechanically robust sulfur (S) cathodes are highly significant for high‐performance lithium‐sulfur (Li‐S) batteries. Herein, a novel 3D hydrogel@S composite as binder‐free high‐performance cathode is presented, which consists of a 3D conductive hydrogel polyaniline (PAN) scaffold coated with dense S particles. The 3D PAN@S composite exhibits polysulfides‐adsorptive performance, suitable structure for accommodating the volume change of S upon lithiation, and improved overall conductivity of the electrode. After cycling for 100 times at 0.2 C, the binder‐free 3D PAN@S composite shows a capacity of 816 mAh g −1 , along with a Coulombic efficiency as high as 99.9%. A good electrochemical performance is also achieved when cycling at a high temperature of 50 °C. In addition, the adsorptive effect of PAN towards polysulfides is demonstrated through density functional theory calculations on the adsorption energies.
Type of Medium:
Online Resource
ISSN:
2194-4288
,
2194-4296
DOI:
10.1002/ente.201801158
Language:
English
Publisher:
Wiley
Publication Date:
2019
detail.hit.zdb_id:
2700412-0