Improved electrochemical performance of cathode material LiNi_0.8Co_0.1Mn_0.1O₂ by doping magnesium via co-precipitation method

Nickel-rich cathode materials is becoming one of the most promising cathode materials for electronic cars and other electronic devices. It is mainly due to their high reversible capacity, high tap density and low cost. However, its inherent defects such as poor capacity retention and safety performance problems limit its rapid development. In this article, the Mg²⁺ has been doped into the crystal lattice homogeneously via co-precipitation method to enhance the poor cyclic and rate behavior of LiNi_0.8Co_0.1Mn_0.1O₂. The result of X-ray diffraction illustrates that the samples possess a layered α-NaFeO₂ structure, and belong to R-3m space group. The content of cation mixing in the sample with Mg²⁺ dopants is much lower than that of pristine sample. the electrochemical features are evaluated by charge and discharge studies, CV and EIS. The initial capacity of NCMM811 sample is 197.06 mAh/g, and after cycling 100 times, the capacity retention still remains at 91.88%, while the capacity retention of pristine sample is only 80.85% at the same circumstances.