High energy density lithium ion batteries using Li_(2.6)Co_(0.4-x)Cu_xN (anode) and Cu_(0.04)V_2O_5 (cathode) electrode materials

摘要

Li_(2.6)Co_(0.4-x)Cu_xN (x=0, 0.15) anode materials were prepared by conventional solid state reaction. Between both materials, Li_(2.6)Co_(0.25)Cu_(0.15)N exhibited better capacity retention than that of Li_(2.6)Co_(0.4)N. According to electrochemical impedance spectroscopy, the better cycling behavior of Li_(2.6)Co_(0.25)Cu_(0.15)N has been attributed to the improvement in interfacial compatibility between the electrode and electrolyte interface. A possible explanation to this was given. Li_(2.6)Co_(0.4-x)Cu_xN/Cu_(0.04)V_2O_5 full-cells were assembled to investigate the reliability of Li_(2.6)Co_(0.04-x)Cu_xN anode materials in practical applications. The Li_(2.6)Co_(0.25)Cu_(0.15)N/Cu_(0.04)V_2O_5 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/LiCoO_2 lithium ion batteries.