Release Time:2019-03-09  Hits:

Indexed by: Journal Article

Date of Publication: 2015-01-01

Journal: JOURNAL OF MATERIALS CHEMISTRY A

Included Journals: Scopus、EI、SCIE

Volume: 3

Issue: 43

Page Number: 21842-21848

ISSN: 2050-7488

Abstract: Graphene as a host material has attracted intense interest to accommodate the sulfur for lithium-sulfur (Li-S) batteries. Nevertheless, there is still a major challenge on how to modulate the nanostructure of graphene architectures to further enhance the electrochemical performance. Herein, self-closure graphene aerogels with inbuilt baffle plates (SGA) were prepared by a combined strategy involving electrostatic assembly, hydrothermal fixing, polydopamine (PDA) coating, and annealing. The electrostatic assembly between graphene oxide (GO) and polystyrene sphere@polydopamine (PS@PDA) is the key factor to form the self-closure aerogels and the graphene sheets wrapped onto the PS@PDAs are responsible for the formation of the baffle plates. When employed as the host material for Li-S batteries, the as-made SGA can contribute to promotion of the transport of electrons, increasing the sulfur loading, confining the dissolution and diffusion of lithium polysulfides, and accommodating the volume expansion. As a result, the as-made SGA-sulfur composite can deliver an outstanding cycling stability of 509 mA h g(-1) after 400 cycles at 1C. The present work will provide a simple and effective approach to tuning the assembly of graphene and further configuring the tailor-made host materials for high-performance Li-S batteries.