title: Three-Dimensional Porous Graphene Aerogel Cathode with High Sulfur Loading and Embedded TiO2Nanoparticles for Advanced Lithium-Sulfur Batteries.
abstract: Three-dimensional graphene aerogel/TiO2/sulfur (GA/TiO2/S) composites are synthesized through a facile, one-pot hydrothermal route as the cathode for lithium-sulfur batteries. With a high sulfur content of 75.1 wt %, the conductive, highly porous composite electrode delivers a high discharge capacity of 512 mA h/g after 250 cycles at a current rate of 1 C with a low capacity decay of 0.128% per cycle. The excellent capacities and cyclic stability arise from several unique functional features of the cathode. (i) The conductive graphene aerogel framework ameliorates ion/electron transfer while accommodating the volume expansion induced during discharge, and (ii) TiO2nanoparticles play an important role in restricting the dissolution of polysulfides by chemical bonds with sulfur.
authors.affiliation: Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology , Clear Water Bay, Kowloon, Hong Kong People's Republic of China.
authors.forename: Jian-Qiu
authors.initials: JQ
authors.lastname: Huang
authors.affiliation: Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology , Clear Water Bay, Kowloon, Hong Kong People's Republic of China.
authors.forename: Zhenyu
authors.initials: Z
authors.lastname: Wang
authors.affiliation: Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology , Clear Water Bay, Kowloon, Hong Kong People's Republic of China.
authors.forename: Zheng-Long
authors.initials: ZL
authors.lastname: Xu
authors.affiliation: Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology , Clear Water Bay, Kowloon, Hong Kong People's Republic of China.
authors.forename: Woon Gie
authors.initials: WG
authors.lastname: Chong
authors.affiliation: Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology , Clear Water Bay, Kowloon, Hong Kong People's Republic of China.
authors.forename: Xianying
authors.initials: X
authors.lastname: Qin
authors.affiliation: Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology , Clear Water Bay, Kowloon, Hong Kong People's Republic of China.
authors.forename: Xiangyu
authors.initials: X
authors.lastname: Wang
authors.affiliation: Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology , Clear Water Bay, Kowloon, Hong Kong People's Republic of China.
authors.forename: Jang-Kyo
authors.initials: JK
authors.lastname: Kim
keywords: chemical interactions; graphene aerogel; hydrothermal synthesis; lithium−sulfur batteries; polysulfide adsorption; titanium dioxide