Oxalic acid-assisted combustion synthesized LiVO3 cathode material for lithium ion batteries

LiVO3 materials are synthesized by combustion method with oxalic acid as fuel. Owing to its relatively low crystallization and small particle size, the LiVO3 calcined at 450 degrees C for 2 h displays optimal electrochemical performances, delivering a high discharge capacity of 298.4 mAh g(-1) and 262.5 mAh g(-1) between 1.0 and 3.5 V at a current density of 50 mA g(-1) and 500 mA g(-1) respectively, and exhibiting good cyclic stability. In this work, the chemical diffusion coefficient of Li+ (DLi+) in the LiVO3 electrode is determined by electrochemical impedance spectroscopy (EIS) and galvanostatic intermittent titration technique (GITT). The value calculated by EIS is in the range of 10(-9)-10(-8) cm(2) s(-1), while it calculated by GITT is 10(-95)-10(-8) cm(2) s(-1). (C) 2013 Elsevier B.V. All rights reserved.