Preparation and characterization of LiV 3O 8 cathode material for lithium secondary batteries through an EDTA-sol-gel method

Abstract

LiV 3O 8 is a very promising cathode material for lithium secondary batteries. An EDTA-sol-gel method was proposed for the first time to obtain LiV 3O 8 at low temperature. LiAc · 2H 2O, NH 4VO 3 and EDTA were used as raw materials to prepare the precursor, and then the precursor was sintered to obtain the layered structure of LiV 3O 8. The effect of sintering temperature and duration on the quality of LiV 3O 8 was investigated. We also tested the electrochemical performances of LiV 3O 8 obtained through the method. The sample heated at 550 °C for 15 h has a single-phase layered structure and it has a first cycle discharge capacity of 251.7 mA h g −1 at the range of 1.8 – 3.6 V at 0.1 mA and an average capacity decay rate of 0.43% per cycle after 30 cycles.