Nitrogen/Sulfur dual-doped carbon cubes with built-in CoS2 nanoparticles (CoS2@NS-C cubes) as an electrocatalyst are developed to improve the high-rate and long-term performance of lithium-oxygen batteries. The CoS2@NS-C cubes were synthesized by coprecipitation between a cobalt salt and 7,7,8,8-tetracyanoquinodimethane (TCNQ) and subsequent thermal sulfidation. TCNQ acted as the coordination polymer for a cube shape and as the nitrogen source for nitrogen-dopants. The CoS2@NS-C cubes comprise uniformly distributed CoS2 nanoparticles in a nitrogen/sulfur dual-doped carbon matrix, providing fast catalytic activity for oxygen reduction/evolution reactions. The CoS2@NS-C cubes exhibited a high-rate performance of 5000 mA g−1 as well as long-term performance of > 100 cycles with a current density of 2000 mA g−1. These results confirmed the enhanced performance of the lithium-oxygen battery, with fast charging capability.
- Fast charge
- Lithium-oxygen battery
- Nitrogen/sulfur dual-doped carbon
ASJC Scopus subject areas
- Environmental Chemistry
- Chemical Engineering(all)
- Industrial and Manufacturing Engineering