Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 925, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2022.166642
Keywords
Graphene oxide; Cu(OH)(2); Lithium-sulfur batteries; Cathode
Ask authors/readers for more resources
This study synthesized graphene oxide (GO)/Cu(OH)(2) composites as hosts for lithium-sulfur batteries to overcome the poor cyclic performance. The GO with oxygen-containing function groups facilitates ion/electron accessibility, and the interlayers of GO provide active sites for polysulfide conversion. The hydrophilic hydroxyl groups in Cu(OH)(2) particles chemically adsorb polysulfides. The synergistic effect of GO and Cu(OH)(2) inhibits the dissolution and shuttling of polysulfides. The lithium-sulfur batteries with GO/Cu(OH)(2) composites exhibit high capacity and excellent cyclic performance.
Lithium-sulfur batteries are advanced energy storage system with high theoretical specific capacity and low cost but suffer from poor cyclic performance. To overcome the shortcomings, this study synthesized graphene oxide (GO)/Cu(OH)(2) composites using the modified Hummers method and electrostatic self-assembly process. The sulfur was anchored in the GO/Cu(OH)(2) composites using the melting method. The oxygen-containing function groups of GO are helpful for achieving good ion/electron accessibility, and the interlayers of GO have many active sites for polysulfide conversion. The polar hydrophilic hydroxyl group of Cu(OH)(2) particles have strong chemisorption for polysulfides during the electrochemical process. Therefore, the synergistic effect of GO and Cu(OH)(2) in the composites as sulfur hosts can inhibit the dissolution and shuttling of polysulfides. The lithium-sulfur batteries with GO/Cu(OH)(2) composites as hosts have high capacity of 1427 mAh g(-1) at 0.1 C, 1222 mAh g(-1) at 0.5 C, and excellent cyclic performance for 250 cycles with a retained capacity of 929 mAh g(-1) (0.5 C). (C) 2022 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available