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.
Bibliographical noteFunding Information:
This work was supported by a Korea University Grant and, the National Research Foundation of Korea (NRF) Grant funded by the Ministry of Science, ICT, and Future Planning [NRF-2017R1C1B2004869, 2019R1A2B5B02070203, and 2018M3D1A1058744].
© 2021 Elsevier B.V.
- Fast charge
- Lithium-oxygen battery
- Nitrogen/sulfur dual-doped carbon
ASJC Scopus subject areas
- General Chemistry
- Environmental Chemistry
- General Chemical Engineering
- Industrial and Manufacturing Engineering