Enhancing polysulfide confinement and conversion in meso-/microporous core–shelled MoC/NC microspheres for lithium–sulfur batteries

Abstract

A core–shelled MoC/NC microsphere with a mesoporous core and a microporous-thin shell serves as a multi-functional sulfur host to enhance polysulfide confinement and conversion in lithium–sulfur batteries.

Renewable biomass-derived carbon-based hosts for lithium–sulfur batteries

“…Therefore, the electrochemical reaction process of the sulfur cathode can be limited to narrow pores, and micropores can effectively restrain the shuttle of polysulfides through physical constraints so that the composites have good reversibility and high rate discharge ability. 97–99 At the same time, the microporous carbon-supported sulfur cathodes manifest different electrochemical behavior from their traditional sulfur counterparts. The conventional sulfur cathode shows two platforms at about 2.4 and 2.1 V vs. Li + /Li during the first discharge, 100,101 while the microporous carbon-supported sulfur cathode showed only a single platform at 1.8 V vs. Li + /Li.…”

Synergistic effect of adsorption and electrocatalysis of CoO/NiO heterostructure nanosheet assembled nanocages for high-performance lithium–sulfur batteries

“…41 It has been demonstrated that the electrical conductivity of TMOs can be improved by dopamine coating and subsequent carbonization treatment. [42][43][44] In addition, nanosheets or the hollow structure can effectively improve the surface area of TMOs, thus enhancing the adsorption and catalytic sites to LiPSs of TMOs. [45][46][47] Moreover, the hollow structure can alleviate the volume expansion during the reduction process of LiPSs, thus improving the cycling stability of Li-S batteries.…”

A graphene oxide scaffold-encapsulated microcapsule for polysulfide-immobilized long life lithium–sulfur batteries

“…Moreover, micromesopores and voids inside the sulfur hosts are able to increase the loading and accommodate the volume-change, respectively. 20,21 Among various carbon-based sulfur hosts, graphene has good potential because of its high specific surface area, mechanical strength, good conductivity and flexibility. 22,23 Cao et al coated nano-sulfur on graphene oxide sheets (GOSs) by using a redox reaction between sodium thiosulfate and hydrochloric acid, which exhibited stable electrochemical performance.…”

“…Moreover, micro–mesopores and voids inside the sulfur hosts are able to increase the loading and accommodate the volume-change, respectively. 20,21…”