title: A dual-spatially-confined reservoir by packing micropores within dense graphene for long-life lithium/sulfur batteries.
abstract: In lithium/sulfur batteries, micropores could bring about strong interactions with polysulfides, but could not alleviate the partial polysulfide overflowing outside because of the volume expansion of the lithiated sulfur. A dual-spatially-confined reservoir for sulfur by wrapping microporous carbon with dense graphene, micro@meso-porous DSC (dual-spatial carbon), is synthesized to solve this issue. Such a structure is prepared through two distinctive methods: graphene promoted in situ hydrothermal carbonization of organics to grow micropores on itself, and liquid mediated drying of graphene hydrogel to form mesoporous graphene frameworks. In contrast to previously reported hierarchical carbon/S, the inner micropores are mainly responsible for loading sulfur, which could help confine its particle size, thus increasing the electrical/ionic conductivity and the utilization of sulfur, and restrain lithium polysulfide dissolution because of strong interaction with pore walls; while the outer mesopores act as another reservoir to stabilize the overflowed polysulfide and to enhance the Li(+) transport. The S-micro@meso-porous DSC cathode exhibits better discharge capacity and cycling performance than S-microporous AC and S-micro@macro-porous DSC, i.e., 59% and 37% higher capacity remaining at 0.5 C than the latter two, respectively.
authors.affiliation: College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China. wangxiaomin@tyut.edu.cn and i-Lab, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, China. ygzhang2012@sinano.ac.cn.
authors.forename: Hongfei
authors.initials: H
authors.lastname: Li
authors.affiliation: School of Materials Science and Engineering, Tongji University, Shanghai 201804, China. yangxw@tongji.edu.cn.
authors.forename: Xiaowei
authors.initials: X
authors.lastname: Yang
authors.affiliation: College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China. wangxiaomin@tyut.edu.cn.
authors.forename: Xiaomin
authors.initials: X
authors.lastname: Wang
authors.affiliation: School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
authors.forename: Yu-Shi
authors.initials: YS
authors.lastname: He
authors.affiliation: i-Lab, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, China. ygzhang2012@sinano.ac.cn.
authors.forename: Fangmin
authors.initials: F
authors.lastname: Ye
authors.affiliation: i-Lab, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, China. ygzhang2012@sinano.ac.cn.
authors.forename: Meinan
authors.initials: M
authors.lastname: Liu
authors.affiliation: i-Lab, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, China. ygzhang2012@sinano.ac.cn and Department of Physics, Tsinghua University, Beijing 100084, China.
authors.forename: Yuegang
authors.initials: Y
authors.lastname: Zhang