3D-hybrid material design with electron/lithium-ion dual-conductivity for high-performance Li-sulfur batteries

摘要

We report a novel 3D-hybrid cathode material with three-dimensional (3D) N-GO/CNT framework to load sulfur (77.6 wt %), and sulfonated polyaniline (SPANI) of coating layer. Used as a cathode material, it possesses a high capacity (1196 mAh g(-1)@0.3 A g(-1)@1.6 mg cm(-2)), excellent charging-discharging rate (680 mAh g(-1)@7.5 A g(-1)) and long-life performance (maintaining 71.1% capacity over 450 cycles), which is mainly attributed to the benefits of excellent electronic/Li-ionic dual-conductivity and confinement effect of the 3D-hybrid N-GO/CNT framework coated by self-doping conducting polymer SPANI. Thus, a 3D sulfur cathode modified with electronic/Li-ionic dual-conduction network can significantly enhance the electrochemical performance and stability, and this novel type of material is very promising for commercial applications that require high energy and power density, long life, and excellent abuse tolerance. (C) 2016 Elsevier B.V. All rights reserved.