Study On The Copper Anode Materials Of Lithium Ion Battery

Currently mostly lithium ion battery cathode material has a weakness that with low discharge capacity, the development of a higher discharge capacity of the material becomes more urgent. The structure of Li2CuO2 cathode material is orthogonal crystal,the theoretical specific capacity has reached 245mAh/g, but the discharge specific capacity and electrochemical stability are improved, and we changing the process and the doping modification to improve its comprehensive performance.(1) We using nanometer ball mill and the spray drying method with high temperature calcination process to synthesis Li2CuO2 anode material, we synthesis the best performance Li2CuO2 anode materials by selection of raw materials, choose the ball grinding process,discuss the lithium content and calcination temperature. We make a Characterization of the material content by XRD, characterize the morphology of the composites by SEM, test and analysis of the material preparation by electrochemical workstation. Samples synthesis at 680 ? has the best of electrochemical performance, for the first time in 0.1C ratio in discharge specific capacity of 153.5mAh/g.(2)We improve the electrochemical properties of Li2CuO2 by doping nickel ion,characterize materials by the XRD, it can be seen that different content of nickel diffraction peak of synthetic material compared to the pure phase Li2CuO2 have different degrees of deviation, the morphology of the composites were characterized by SEM, it can be seen that a molten rod structure after doping of nickel. After package button battery and test it, we found the sample Li2Cu0.5Ni0.5O2 with a best electrochemical properties that the first discharge capacity reached 235.5mAh/g.(3) Based on the best performance of the Li2Cu0.5Ni0.5O2, We doping the Na ion to improve its surface morphology and the electrochemical properties and SEM was used to characterizing the shape of material, it can be seen that material presents a single rod structure.Using electrochemical workstation testing the button batteries, the first discharge specific capacity of the sample reached 278.8mAh/g when the sodium content was 2%, and specific surface area is also greatly improved.