An aqueous rechargeable lithium-ion battery based on LiCoO _2 nanoparticles cathode and LiV _3O _8 nanosheets anode

摘要

Nanoparticles of lithiumcobalt oxide (LiCoO _2) and nanosheets of lithium vanadium oxide (LiV _3O _8) were synthesized by a citrate sol-gel combustion route. The physical characterizations of the electrodic materials were carried out by scanning electron microscopy (SEM), transmission electron microscopy (TEM), and also X-ray diffraction (XRD) measurements. Near spherical nanoparticles of 100 nm and compact nanosheets with a few nanometers thick were observed by SEM and TEM for LiCoO _2 and LiV _3O _8, respectively. XRD data indicated that the asprepared active materials presented pure phase of rhombohedral LiCoO _2 with R-3m symmetry and monoclinic LiV _3O _8 with p21/m symmetry. The kinetics of electrochemical intercalation of lithium ion into the nanoparticles of LiCoO _2 and nanosheets of LiV _3O _8 from 1.0 mol l-1 LiNO3 aqueous solution were investigated by cyclic voltammetry and chronoamperometry. An aqueous rechargeable lithium-ion battery consisting of LiCoO _2 nanoparticles as positive and LiV _3O _8 nanosheets as negative electrode was assembled. This battery represented a discharge voltage of about 1 V with good cycling performance.