Layered structured LiNi0.9Co0.05Mn0.025Mg0.025O2 was successfully synthesized by heating a mixture of /3- Ni0.9Co0.05Mn0.025Mg0.025 (OH)2 and LiOH·H2O at elevated temperature. Differential scanning calorimetry (DSC) and thermogravimetry analysis (TGA) were employed to study the reaction process. The Ni0.9Co0.05Mn0.025Mg0.025 (OH)2 and synthesized LiNi0.9Co0.05Mn0.025Mg0.025O2 were characterized by means of X-ray diffraction (XRD) and scanning electron microscope (SEM), while the electrochemical properties of LiNi0.9Co0.05Mn0.025Mg0.025O2 were investigated by charge-discharge test and cyclic voltammetry (CV). Structure analysis shows the LiNi0.9Co0.05Mn0.025Mg0.025O2 synthsized at 750 °C for 12 h possess a well-layered hexagonal structure and a low level of the cation-mixing of Li layer. Scaning electron micrographs reveal that the morphology of the samples is characterized by spherical second particles of ~15 μm. The analysis from electrochemical test suggests that heating the mixture at 750 °C for 12 h is the optimized synthesis condition for highest initial discharge capacity and best cycling performance. The first discharge specific capacity between 2.8 and 4.3 V at 0.2C is tested to be 207 mAh·g-1 and 92.5% of the discharge capacity remained after 40 cycles.The CV result shows that the multi-doping of Co, Mn and Mg has strengthened the cycling capability.
|Number of pages||6|
|Journal||Chinese Journal of Inorganic Chemistry|
|Publication status||Published - Jun 2012|
- High capacity
- Lithium ion batteries
ASJC Scopus subject areas
- Inorganic Chemistry