Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 16, Pages 13573-13580Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b02084
Keywords
nitrogen and oxygen; dual-doped; lithium-sulfur batteries; highly porous; carbon
Funding
- Australian Research Council (ARC) [DP160102627, LP160100273]
- National Natural Science Foundation of China [51671140]
- Shanxi Scholarship Council of China [2015-034]
- Natural Science Foundation of Shanxi Province of China [201701D221077]
- Science and Technology Innovation Project of Shanxi Higher School [2017129]
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Lithium-sulfur (Li-S) batteries have received tremendous attention because of their extremely high theoretical capacity (1672 mA h g(-1)) and energy density (2600 W h kg(-1)). Nevertheless, the commercialization of Li-S batteries has been blocked by the shuttle effect of lithium polysulfide intermediates, the insulating nature of sulfur, and the volume expansion during cycling. Here, hierarchical porous N,O dual-doped carbon microrods (NOCMs) were developed as sulfur host materials with a large pore volume (1.5 cm(3) g(-1)) and a high surface area (1147 m(2) g(-1)). The highly porous structure of the NOCMs can act as a physical barrier to lithium polysulfides, while N and O functional groups enhance the interfacial interaction to trap lithium polysulfides, permitting a high loading amount of sulfur (79-90 wt % in the composite). Benefiting from the physical and chemical anchoring effect to prevent shuttling of polysulfides, S@NOCMs composites successfully solve the problems of low sulfur utilization and fast capacity fade and exhibit a stable reversible capacity of 1071 mA h g(-1) after 160 cycles with nearly 100% Coulombic efficiency at 0.2 C. The N,O dual doping treatment to porous carbon microrods paves a way toward rational design of high-performance Li-S cathodes with high energy density.
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