One of the main limiters to the commercialization of high energy density lithium-sulfur batteries is the dissolution of long-chain lithium polysulfides into the electrolyte, which limits cycling performance. A team from Korea University is addressing this problem by developing a novel Nafion-coated NiCrAl/S cathode and using lithium powder as an anode.
The team synthesized the Nafion-coated NiCrAl/S cathode using a two-step dip-coating technique. The lithium-powder anode was used instead of a lithium-foil anode to prohibit dendrite growth and to improve on the electrochemical behaviors.
The cells showed an initial discharge capacity of about 900 mA g−1 and a final discharge capacity of 772 mA g-1 after 100 cycles at 0.1 C-rate.
Scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) demonstrate that using the Nafion-coated NiCrAl/S cathode can suppress the dissolution of long-chain lithium polysulfides.—Oh et al.
Oh, S. J., Lee, J. K. and Yoon, W. Y. (2014) “Preventing the Dissolution of Lithium Polysulfides in Lithium–Sulfur Cells by using Nafion-coated Cathodes,” ChemSusChem doi: 10.1002/cssc.201402318