Journal
ADVANCED MATERIALS INTERFACES
Volume 1, Issue 7, Pages -Publisher
WILEY
DOI: 10.1002/admi.201400227
Keywords
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Funding
- National Natural Science Foundation of China [21306103]
- China Postdoctoral Science Foundation [2012M520293, 2013T60125]
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The use of conductive frameworks as the host scaffold to obtain nanostructured sulfur cathodes is an efficient way to increase the sulfur utilization for redox reaction in Li-S batteries with large discharge capacity and high energy density. However, due to dynamical interfaces driven by phase evolution between the conductive hosts and S-containing guests during cycling, the cathode still faces poor stability. Herein, the use of O-/N-containing nanocarbon as the conductive host sheds a light on the role of the dynamic interface between the carbon host and S-containing guest for a stable Li-S cell. The outstanding reversibility and stability of N-doped C/S cathodes are attributed to the favorable guest-host interaction at the electron-modified interface, manifesting as (i) a chemical gradient to adsorb polar polysulfides and (ii) ameliorative deposition and recharging of Li2S on the region of electron-rich pyridinic N and a graphene domain surrounding quaternary N. Highly reversible, efficient and stable Li storage properties such as mitigated polarization and charge barrier, high capacity of 1370 and 964 mAh g(-1) at 0.1 and 1.0 C, respectively, and 70% of capacity retention after 200 cycles are achieved. Mechanistic insight into the capacity fading inspires the rational design on electrodes for high-performance electrochemical systems.
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