High energy density lithium ion batteries using Li2.6Co0.4 − xCuxN (anode) and Cu0.04V2O5 (cathode) electrode materials

Li_2.6Co_0.4 - xCu_xN (x = 0, 0.15) anode materials were prepared by conventional solid state reaction. Between both materials, Li_2.6Co_0.25Cu_0.15N exhibited better capacity retention than that of Li_2.6Co_0.4N. According to electrochemical impedance spectroscopy, the better cycling behavior of Li_2.6Co_0.25Cu_0.15N has been attributed to the improvement in interfacial compatibility between the electrode and electrolyte interface. A possible explanation to this was given. Li_2.6Co_0.4 - xCu_xN/Cu_0.04V₂O₅ full-cells were assembled to investigate the reliability of Li_2.6Co_0.4 - xCu_xN anode materials in practical applications. The Li_2.6Co_0.25Cu_0.15N/Cu_0.04V₂O₅ cell delivered a specific capacity of 260 mA h g^− 1, and a specific energy of 505.7 mW h g^− 1, which was much higher than that of C/LiCoO₂ lithium ion batteries.