Abstract
? 2022 Elsevier B.V.Cobalt ferrite (CoFe2O4) nanoparticles are synthesized by sol-gel method using spent LiCoO2 batteries as raw materials successfully. The CoFe2O4 nanoparticles are subsequently coated with N-doped carbon by the carbonization of polydopamine obtained through self-polymerization of dopamine. The N-doped carbon layers with different thickness does not affect the structure and microstructure of CoFe2O4 and they are coated on the surface of CoFe2O4 nanoparticles confirmed by transmission electron microscopy. CoFe2O4/NC30 exhibited superior electrochemical performance, such as high specific capacity (919.6 mAh/g for initial cycle at 0.1 A/g), excellent cycling performance (662.9 mAh/g after 200 cycles at 0.1 A/g) and rate capability (357.9 mAh/g at 2 A/g) for using as anodes in lithium-ion batteries compared with pristine CoFe2O4 and other CoFe2O4/NC nanocomposites. The improved electrochemical performance could be ascribed to enhanced electrical conductivity and structural stability aroused by the N-doped carbon layers.
NSTL
Elsevier