Preparation of Li9Cr3(P2O7)_3(PO4)_2 as cathode material for lithium ion batteries through sol-gel method

摘要

The compound Li9Cr3(P2O7)_3(PO4)_2 has been successfully synthesized using sol-gel method. X-ray diffraction Rietveld refinement analysis indicates that single phase Li9Cr3(P2O7)_3(PO4)_2 can be obtained under air condition and high purity nitrogen atmosphere. Scanning electron microscopy indicates that nanowires with lengths ranging from several to tens micrometers and diameters varying from 100nm to 500nm can be obtained in the Li9Cr3(P2O7)_3(PO4)_2 compound heated under air condition. The electrochemical properties of Li9Cr3(P2O7)_3(PO4)_2 sintered under N2 as cathode material is reported for the first time. The XRD patterns of the electrodes before and after 30 cycles indicate that the Li9Cr3(P2O7)_3(PO4)_2 keeps its original monodiphosphate structure.