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High-Performance Li–Se Batteries Enabled by Selenium Storage in Bottom-Up Synthesized Nitrogen-Doped Carbon Scaffolds
journal contribution
posted on 2017-07-10, 00:00 authored by Hongling Lv, Renpeng Chen, Xiaoqi Wang, Yi Hu, Yanrong Wang, Tao Chen, Lianbo Ma, Guoyin Zhu, Jia Liang, Zuoxiu Tie, Jie Liu, Zhong JinSelenium
(Se) has great promise to serve as cathode material for rechargeable
batteries because of its good conductivity and high theoretical volumetric
energy density comparable to sulfur. Herein, we report the preparation
of mesoporous nitrogen-doped carbon scaffolds (NCSs) to restrain selenium
for advanced lithium–selenium (Li–Se) batteries. The
NCSs synthesized by a bottom-up solution-phase method have graphene-like
laminar structure and well-distributed mesopores. The unique architecture
of NCSs can severe as conductive framework for encapsulating selenium
and polyselenides, and provide sufficient pathways to facilitate ion
transport. Furthermore, the laminar and porous NCSs can effectively
buffer the volume variation during charge/discharge processes. The
integrated composite of Se-NCSs has a high Se content and can ensure
the complete electrochemical reactions of Se and Li species. When
used for Li–Se batteries, the cathodes based on Se-NCSs exhibit
high capacity, remarkable cyclability, and excellent rate performance.
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graphene-like laminar structureBottom-Up Synthesized Nitrogen-Doped Carbon Scaffolds SeleniumSe contentconductive frameworkion transportenergy densitymesoporous nitrogen-doped carbon scaffoldswell-distributed mesoporesSelenium Storageelectrochemical reactionsbottom-up solution-phase methodLi speciesbatterieSe-NCSs exhibitcathode materialvolume variationrate performanceencapsulating selenium
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