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The immobilizing polysulfide mechanism of cadmium-doping carbon aerogels via a microtemplate for high performance Li–S batteries

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Abstract

Cadmium-doped carbon aerogels were successfully prepared via a microtemplate inducing strategy and subsequent high temperature carbonization. The controlled synthesis technology forms spherical carbon aerogels with uniform and interconnected porous structures. The as-prepared materials display large specific surface area and excellent conductivity. The loaded sulfur composites as cathode materials exhibit high discharge capacity and excellent cycling performance. Particularly, the designed P2-Cd-CA/S electrode with 78.9 wt% sulfur presents an initial discharge capacity of 1318 mA h g−1 at 0.2C. And it delivers an initial discharge capacity of 1189 mA h g−1 at 0.5C and still maintains 871 mA h g−1 after 300 cycles. The enhanced performance is mainly ascribed to the synergistic effect of the inductive graphitization of a microtemplate (3,4,9,10-perylenetetracarboxylic dianhydride) and the stronger anchoring for polysulfides of evenly distributed cadmium. Furthermore, the first-principles theoretical calculations further support the strong adsorption between CdO and polysulfides and affirmatively reveal the immobilizing mechanism.

Graphical abstract: The immobilizing polysulfide mechanism of cadmium-doping carbon aerogels via a microtemplate for high performance Li–S batteries

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Article information


Submitted
30 Oct 2019
Accepted
09 Dec 2019
First published
09 Dec 2019

New J. Chem., 2020, Advance Article
Article type
Paper

The immobilizing polysulfide mechanism of cadmium-doping carbon aerogels via a microtemplate for high performance Li–S batteries

L. Ma, X. Li, W. Gao, X. Zhang, P. Xu, Y. Shu, J. Ye, B. Zheng and Y. Ding, New J. Chem., 2020, Advance Article , DOI: 10.1039/C9NJ05405G

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