Abstract
Herein, three-dimensional (3D) N-doped reduced graphene oxide (N-rGO) nanosheets were decorated with a uniform distribution of Co-Ni-S (CNS) nanoparticles to form the CNS/N-rGO composite as a sulfur host material for lithium-sulfur batteries. The CNS nanoparticles and N in CNS/N-rGO strongly interact with polysulfides, whereas graphene, as a conductive network, can improve its electrical conductivity. A CNS/N-rGO/sulfur composite cathode was prepared via the sulfur melting diffusion method. The electrochemical study showed that the CNS/N-rGO/sulfur cathode delivered an initial discharge capacity of 1430 mA h g-1 at a current density of 0.1C. Moreover, it retained a specific capacity of 685 mA h g-1 after 300 cycles at 0.5C with a coulombic efficiency of 98%, which was better than that of commercial rGO. This composite was used as a sulfur cathode for a lithium-sulfur battery, exhibiting excellent rate capability and remarkable performance in terms of long cycling stability.
Original language | English (US) |
---|---|
Pages (from-to) | 32247-32257 |
Number of pages | 11 |
Journal | RSC Advances |
Volume | 9 |
Issue number | 55 |
DOIs | |
State | Published - 2019 |
ASJC Scopus subject areas
- General Chemistry
- General Chemical Engineering