Hierarchical Porous N-Doped Carbon Nanosheets Obtained by Organic-Inorganic Bipolymeric Engineering for Improved Lithium-Sulfur Batteries.

A new route for obtaining N-doped carbon nanosheets through an in situ solid-state thermal organic-inorganic polymerization and carbonization method, with glucose and melamine as precursors, due to different temperature intervals for glucose or melamine polymerization, is reported. At a current rate of 0.2 C, as a cathode for a lithium-sulfur cell, the N-doped carbon nanosheet/sulfur hybrid delivers a high capacity of 1313 and 722 mA h g-1 in the 1st and 200th cycles, respectively; these values are over 40 % higher than that of cells with glucose-derived carbon nanosheets.