CNT-assembled dodecahedra core@nickel hydroxide nanosheet shell enabled sulfur cathode for high-performance lithium-sulfur batteries

By Huali Wu, Y. Li, Juan Ren, Dewei Rao, Qiaoji Zheng, Liang Zhou, Dunmin Lin. Nano Energy, 2019

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Abstract Herein, we report the construction of three-dimensional hollow core@shell structure composed of N-doped CNT-assembled dodecahedra core derived from ZIF-67 and Ni(OH)2 nanosheet shell as the sulfur scaffold for Li-S batteries. The obtained sulfur cathode demonstrates outstanding electrochemical performance, including a high reversible capacity (1321 mAh g−1 at 0.1 C), excellent rate capability (1030 and 753 mAh g−1 at 1 and 3 C, respectively), and superior cycling stability (611 mAh g−1 after 1000 cycles at 3 C). The enhancement in electrochemical performance can be ascribed to the unique core@shell architecture: the interconnected CNT-assembled dodecahedra core provides rapid Li+/e- transport and sufficient free space for volume change; the Ni(OH)2 nanosheet shell not only acts as a durable physical barrier, but also serves as the polar material to restrain the dissolution of polysulfides with chemical interaction. In addition, in-situ nitrogen doping in CNTs introduces rich defects and active sites for polysulfides adsorption. This work provides a promising direction for high performance Li-S batteries by coating strong polar material on carbon materials.

Subfields: Electrical and Electronic Engineering

View Paper: https://www.semanticscholar.org/paper/c523291ca3cfa7a3847139b51ca5934fd2486231