High-low Temperature Properties of Ni-rich LiNi0.6Co0.2Mn0.2O2 Cathode Material by Hydrothermal Synthesis with CTAB Assisted

Using acetate as raw material,cetyltrimethyl ammonium bromide (CTAB) as dispersing agent, LiNi0.6Co0.2Mn0.2O2 cathode material was synthesized by hydrothermal method after high temperature two-step sintering. The experiments proved that proper addition of the dispersant CTAB can effectively adjust the particle morphology, reduce Ni2+/Li+ cation mixing and improve the electrochemical properties of the material. When 2% (mass fraction) CTAB was added, the LNi0.6Co0.2Mn0.2O2 cathode material had an ordered layered structure and the particles of the material were homogeneous and dispersed. Furthermore,and the optimal cycling performance and the high-low temperature performance were obtained. The retention rate of the material was 88.5 % after 100 cycles in the voltage range of 3.0-4.3 V at a rate of 1C and 25 degrees C. The initial discharge specific capacity were 60.3, 168.5 and 207.2 mA.h/g,respectively, at a rate of 0.1C under the environmental conditions of -20, 25 and 55 degrees C, which provided a strong basis for the wider application of the material.