3D dual-confined sulfur encapsulated in porous carbon nanosheets and wrapped with graphene aerogels as a cathode for advanced lithium sulfur batteries

Hou, Yang; Li, Jianyang; Gao, Xianfeng; Wen, Zhenhai; Yuan, Chris; Chen, Junhong

doi:10.1039/c5nr09037g

Title: 3D dual-confined sulfur encapsulated in porous carbon nanosheets and wrapped with graphene aerogels as a cathode for advanced lithium sulfur batteries

Journal Article · 15 March 2016 · Nanoscale

DOI: https://doi.org/10.1039/c5nr09037g · OSTI ID:1437631

Hou, Yang ^[1]; Li, Jianyang ^[2]; Gao, Xianfeng ^[2]; Wen, Zhenhai ^[2]; Yuan, Chris ^[2]; Chen, Junhong ^[2]

Univ. of Wisconsin, Milwaukee, WI (United States). Dept. of Mechanical Engineering; University of Wisconsin-Madison
Univ. of Wisconsin, Milwaukee, WI (United States). Dept. of Mechanical Engineering

Although lithium–sulfur (Li–S) batteries have attracted much attention due to their high theoretical specific energy and low cost, their practical applications have been severely hindered by poor cycle life, inadequate sulfur utilization, and the insulating nature of sulfur. Here, we report a rationally designed Li–S cathode with a dual-confined configuration formed by confining sulfur in 2D carbon nanosheets with an abundant porous structure followed by 3D graphene aerogel wrapping. The porous carbon nanosheets act as the sulfur host and suppress the diffusion of polysulfide, while the graphene conductive networks anchor the sulfur-adsorbed carbon nanosheets, providing pathways for rapid electron/ion transport and preventing polysulfide dissolution. As a result, the hybrid electrode exhibits superior electrochemical performance, including a large reversible capacity of 1328 mA h g^-1 in the first cycle, excellent cycling stability (maintaining a reversible capacity of 647 mA h g^-1 at 0.2 C after 300 cycles) with nearly 100% Coulombic efficiency, and a high rate capability of 512 mA h g^-1 at 8 C for 30 cycles, which is among the best reported rate capabilities.

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Research Organization:: Univ. of Wisconsin, Milwaukee, WI (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE)

Grant/Contract Number:: EE0003208

OSTI ID:: 1437631

Journal Information:: Nanoscale, Journal Name: Nanoscale Journal Issue: 15 Vol. 8; ISSN 2040-3364

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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