Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6471108 | Electrochimica Acta | 2017 | 8 Pages |
â¢Li3VO4/C/rGO ternary composite with honeycomb-like structure is prepared by taking advantage of spray drying method and polystyrene (PS) soft template.â¢Li3VO4/C/rGO composite electrode possesses rapid Li+ ions intercalation kinetics and good structure integrity.â¢Li3VO4/C/rGO composite exhibits outstanding high-rate performance and long cycle-life (the high reversible capacity of 312 mAh gâ1 can be maintained after 1000 cycles at 10C).
Li3VO4/C/rGO (HC-LVO/C/G) ternary composite with honeycomb-like structure is successfully prepared through a simple spray drying method with polystyrene (PS) microspheres as soft template. In this characteristic structure, carbon-coated Li3VO4 nanoparticles are well wrapped by rGO sheets and uniformly distributed within the honeycomb-like micrometer-sized clusters. The double coating layers of amorphous carbon and rGO can avoid the direct exposure of Li3VO4 nanoparticles to the electrolyte and enhance the electronic conductivity. Meanwhile, the honeycomb-like structure can shorten the diffusion paths of Li+ ions and favors the relaxation of the strain/stress during cycling. The resultant HC-LVO/C/G composite exhibits significantly improved high-rate performance and long cycle-life (the high reversible capacity of 312 mAh gâ1 can be maintained after 1000 cycles at 10 C) compared with the contrastive Li3VO4/C composite synthesized by a typical solid-state reaction method.
Graphical abstractDownload high-res image (171KB)Download full-size image