Journal
ELECTROCHIMICA ACTA
Volume 192, Issue -, Pages 467-474Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2016.01.196
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Funding
- National Natural Science Foundation of China [90922034]
- development program of China (863 Program) [2015AA030901]
- Postdoctoral Science Foundation of Anhui Province
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To improve the electrochemical performance of lithium sulfur batteries, a conductive Lewis base matrix, nitrogen doped graphene (NG), was prepared here through a facile strategy of annealing a polypyrrole/ reduced graphene oxide composite. The obtained NG was demonstrated with enriched pyridinic-N doping and was employed as the matrix of sulfur cathode with ultra-high rates, reversible capacity and high coulombic efficiency. The improved performance can be attributed to the high conductivity of the NG and the enhanced adsorption energy of Li2Sn (n=4-8) on the NG surface. The NG can act not only as an electronic conductive network but also as a Lewis base catalyst matrix that promotes the higher Li2Sn to be further oxidized completely to S-8 as demonstrated in the cyclic voltammetry curve, which can thus significantly improve the sulfur utilization and cyclic stability even at a high sulfur loading of 75% (w/w) in the S@NG composite. (C) 2016 Elsevier Ltd. All rights reserved.
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