Core@Shell Sb@Sb2O3 Nanoparticles Anchored on 3D Nitrogen-doped Carbon Nanosheets as Advanced Anode Materials for Li-ion Batteries
Antimony (Sb) based materials are regarded as promising anode materials for Li-ion batteries (LIBs) because of its high capacity, appropriate working potential, and earth abundance. However, the quick capacity decay due to huge volume expansion during cycling process seriously hinders its practical applications. Here, a nanocomposite of core@shell Sb@Sb2O3 particles anchored on 3D porous nitrogen-doped carbon (3DNC) nanosheets is synthesized by freeze drying and sintering under reducing atmosphere. Structural characterizations show that the developed Sb@Sb2O3/3DNC electrode renders high surface area (839.8 m2 g-1) and unique Sb-O-C bonding, both contributing to the excellent electrochemical performance. The initial charge and discharge specific capacities of the Sb@ Sb2O3/3DNC anode in LIB tests are 1109 mAh g-1 and 1810 mAh g-1, respectively. Also, it shows a charge capacity of 696.9 mAh g-1 after 500 cycles at 1 A g-1 and 458 mAh g-1 at a current density of 5 A g-1. Moreover, the assembled Sb@Sb2O3/3DNC‖LiNi0.6Co0.2Mn0.2O2 battery exhibits a discharge capacity of more than 100 mAh g-1 after 25 cycles at 100 mA g-1. The synthetic method can be extended to obtain other nanocomposite of metal and carbon materials for high-performance energy storage devices.
- This article is part of the themed collection: Nanoscale Advances HOT Article Collection