Electrochemical Properties of High Nickel Content Li(Ni0.7Co0.2Mn0.1)O2 with an Alumina Thin-Coating Layer as a Cathode Material for Lithium Ion Batteries

The cathode material, high Nickel content Ni 0.7 Co 0.2 Mn 0.1 (NCM), was synthesized by coprecipitation with NH 4 OH used as a complexing agent. The prepared materials are made in the formation of spherical particles of Li(Ni 0.7 Co 0.2 Mn 0.1 )O 2 of several micrometers in diameter. Al 2 O 3 was coated by an impregnation method and its content was gradually increased to 1, 2 and 5 wt%. As a result, 1 wt% coated Al 2 O 3 compared to pristine NCM exhibited 82% and 80% retention rates at 5 C and 1 wt% Al 2 O 3 coated NCM recovery at 0.2 C after 5 C showed 100%. In addition, capacity retention of 1 wt% NCM+Al gently decreased in 100 cycle life characteristics, and capacity retention of 95% or more was confirmed.