Abstract
The construction of sulfur cathode host which can effectively prevent the diffusion of soluble polysulfides and improve the reaction dynamics is the key to the development of high-performance Li–S batteries. Herein, a nitrogen-doped CuCo2O4 double shell hollow mesoporous sphere structure assembled with ultrafine nanoparticles was reported. As a multifunctional sulfur species carrier, the unique double shell provides multiple confinement spaces, chemisorption and catalytic sites, further impeding the “shuttle effect” of polysulfides. Meanwhile, the higher surface area and abundant porosity reduce the sulfur layer thickness and shorten the charge transfer path respectively, which is conducive to the rapid redox kinetics to polysulfides. Thanks to this enhanced confinement effect, a Li-S cell with the NCuCo2O4@S as the cathode shows excellent cycle stability, high sulfur loading, and rapid charge–discharge capability. This work provides a promising strategy for achieving high performance Li–S batteries by using metal compounds with a unique hollow structure.
Published Version
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