Multifunctional LDH/Co9S8 heterostructure nanocages as high-performance lithium–sulfur battery cathodes with ultralong lifespan

By Shixia Chen, Junhui Luo, Nuoyan Li, Xinxin Han, Jun Wang, Q. Deng, Zheling Zeng, Shuguang Deng. 2020

220 citations recorded by the source corpus.

Abstract Layered double hydroxides (LDHs) are promising lithium polysulfides (LiPSs) mediators, but the implementation of LDHs-based cathodes as high-performance lithium-sulfur batteries (LSBs) is hindered by their poor electrical conductivity and limited active sites. Herein, we report a hollow NiCo-LDH/Co9S8 (H-LDH/Co9S8) heterostructure with ordered nanocage morphology by in situ transformations of ZIF-67. The H-LDH/Co9S8 heterostructure could physically inhibit the LiPSs diffusion and accommodate sufficient sulfur. The abundant exposed O- and Co-adsorption sites could firmly entrap LiPSs and electrocatalytically boosted their conversion kinetics. Moreover, the intimated interfaces of NiCo-LDH and Co9S8 domains endow a significantly improved electron conductivity and Li+ ion diffusivity. As a result, H-LDH/Co9S8 delivers a high discharge capacity of 1339.1 ​mAh g−1 at the current density of 0.1C and shows an ultrastable lifespan over 1500 cycles with a small capacity decay of 0.047% per cycle and stable coulombic efficiency above 98% at the current density of 1.0C. This work paves a new way to fabricate and utilize LDH materials as high-performance LSB cathodes and provides new insights into the multifunctional heterostructure as ultralong life span electrodes.

Subfields: Electrical and Electronic Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/8bd1d03e4a254a6837e03ae7828f02726b278fcf