Hydrothermally-assisted co-precipitation and Electrochemical Performance of LiNi_1/3Co_1/3Mn_1/3O₂ Cathode Material

摘要

Hydrothermally-assisted co-precipitation method is conducted to prepare the precursor of layered materials LiNi1/3Co1/3Mn1/3O2. The LiNi1/3Co1/3Mn1/3O2 cathode materials are synthesized after calcining the as-prepared precursor for different hours at 850 °C. The high-temperature and high- pressure conditions that the hydrothermal-assisted method possesses can rapidly improve the crystallization speed of LiNi1/3Co1/3Mn1/3O2 precursor also with the well-defined layer structures and low degree of cation mixing. As the result, the hydrothermally-assisted co-precipitation method can save almost half the time of precursor reaction and calcination compared with reported co-precipitation methods. At the same time, the good comprehensive electrochemical performance can be obtained with the large initial discharge capacity of 193.5 mAh·g-1 at 0.1 C (1.0 C = 183.0 mA·g-1), the capacity fading rate per cycle of only 0.016 % based on 135 cycles and the high-rate discharge ability of 126 mAh·g-1 at 4.0 C. Adopting the hydrothermally-assisted co-precipitation method is very helpful to boost the utilization of production equipments and reduce the manufacturing cost of the LiNi1/3Co1/3Mn1/3O2 material.