Three-Dimensionally Hierarchical Graphene Based Aerogel Encapsulated Sulfur as Cathode for Lithium/Sulfur Batteries
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Date
2018-01-26
Authors
Li, Haipeng
Sun, Liancheng
Wang, Zhuo
Zhang, Yongguang
Tan, Taizhe
Wang, Gongkai
Bakenov, Zhumabay
Journal Title
Journal ISSN
Volume Title
Publisher
MDPI
Abstract
A simple and effective method was developed to obtain the electrode for lithium/sulfur
(Li/S) batteries with high specific capacity and cycling durability via adopting an interconnected
sulfur/activated carbon/graphene (reduced graphene oxide) aerogel (S/AC/GA) cathode
architecture. The AC/GA composite with a well-defined interconnected conductive network was
prepared by a reduction-induced self-assembly process, which allows for obtaining compact and
porous structures. During this process, reduced graphene oxide (RGO) was formed, and due to the
presence of oxygen-containing functional groups on its surface, it not only improves the electronic
conductivity of the cathode but also effectively inhibits the polysulfides dissolution and shuttle.
The introduced activated carbon allowed for lateral and vertical connection between individual
graphene sheets, completing the formation of a stable three-dimensionally (3D) interconnected
graphene framework. Moreover, a high specific surface area and 3D interconnected porous structure
efficiently hosts a higher amount of active sulfur material, about 65 wt %. The designed S/AC/GA
composite electrodes deliver an initial capacity of 1159 mAh g1 at 0.1 C and can retain a capacity of
765 mAh g1 after 100 cycles in potential range from 1 V to 3 V.
Description
Keywords
lithium/sulfur battery, cathode, sulfur/activated carbon/graphene aerogel composite, reduced graphene oxide, electrochemical performance
Citation
Li, H.; Sun, L.; Wang, Z.; Zhang, Y.; Tan, T.; Wang, G.; Bakenov, Z. Three-Dimensionally Hierarchical Graphene Based Aerogel Encapsulated Sulfur as Cathode for Lithium/Sulfur Batteries. Nanomaterials 2018, 8, 69.