Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 23, Pages 19311-19317Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b03830
Keywords
iron- and nitrogen-doped carbon; single-atomic catalysis; polysulfide conversion; Li2S; lithium-sulfur batteries
Funding
- Nature Science Foundation of Beijing Municipality [2172051]
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University
- State Key Laboratory of Electroanalytical Chemistry [SKLEAC201708]
- National Natural Science Foundation of China [21575015, 51772030]
- National Key Research and Development Program of China New Energy Project for Electric Vehicle [2016YFB0100204]
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Lithium-sulfur batteries have been regarded as promising candidates for energy storage because of their high energy density and low cost. It is a main challenge to develop long-term cycling stability battery. Here, a catalytic strategy is presented to accelerate reversible transformation of sulfur and its discharge products in lithium-sulfur batteries. This is achieved with single-atomic iron active sites in porous nitrogen-doped carbon, prepared by polymerizing and carbonizing diphenylamine in the presence of iron phthalocyanine and a hard template. The Fe-PNC/S composite electrode exhibited a high discharge capacity (427 mAh g(-1)) at a 0.1C rate after 300 cycles with the Columbic efficiency of above 95.6%. Besides, the electrode delivers much higher capacity of 557.4 mAh g(-1) at 0.5C over 300 cycles. Importantly, the Fe-PCN/S has a smaller phase nucleation overpotential of polysulfides than nitrogen-doped carbon alone for the formation of nanoscale of Li2S as revealed by ex situ SEM, which enhance lithium-ion diffusion in Li2S, and therefore a high rate performance and remarkable cycle life of Li-sulfur batteries were achieved. Our strategy paves a new way for polysulfide conversion with atomic iron catalysis to exploit high-performance lithium-sulfur batteries.
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