Journal
ADVANCED MATERIALS INTERFACES
Volume 5, Issue 10, Pages -Publisher
WILEY
DOI: 10.1002/admi.201701598
Keywords
carbon nanofiber; in situ polymerization; lithium-sulfur batteries; polyaniline
Funding
- State of North Carolina
- National Science Foundation [ECCS-1542015]
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Lithium-sulfur (Li-S) batteries have been considered as a promising next-generation energy storage system. However, practical application of Li-S batteries is hindered by the nonconductive nature of sulfur (S) and continuous capacity fading during cycling. Here, a simple but effective strategy is proposed to fabricate high-performance Li-S batteries by in situ polymerization of polyaniline (PANi)/S/carbon nanofiber (CNF) cathode. Compared to traditional carbon black/S cathodes and other cathode materials with PANi polymer, this effective three-dimensional (3D) cathode design has several advantages: (i) the interconnected and highly conductive CNF/PANi network structure facilitates the electron transfer between the insulating S and conductive CNF mat; (ii) the CNF/PANi network structure, with abundant oxygen and nitrogen heteroatoms, offers strong adsorption for the polysulfides; (iii) the 3D architecture of CNF/S/PANi helps accommodate the volume change of S during cycling and maintain the structural integrity of the cathode; (iv) the easy and simple fabrication process minimizes the time and energy costs; and (v) the freestanding composite cathode without additional polymer binder contributes to higher energy density of Li-S batteries. With all the advantages mentioned above, Li-S cells present a high S utilization with stable cycling performance for over 300 cycles with a low capacity decay rate of 0.08% cycle(-1).
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