A new treatment of LiV₃O_8 has been proposed for improving its electrochemical behavior as a cathode material for secondary lithium batteries. Lithium trivanadate, LiV₃O_8 can be prepared in a finely dispersed form by dehydration of aqueous lithium trivanadate gels. The ultrasonic treatment method for LiV₃O_8 has been examined in comparsion with LiV₃O_8 prepared by solution method. The ultrasonically treated products under the water circumstance were characterized by XRD, DSC, and SEM. These measurements showed that the ultrasonic treatment process of aqueous LiV₃O_8 caused a decrease in crytallinity and considerable increased in specific surface area and interlayer spacing. The product, ultrasonically treated for 2hr, specially showed lowest crytallinity, so it can be expected that specific surface area increased. The ultrasonic treated LiV₃O_8 can not only enlarge the specific capacity, but also imporve the cycling behavior.