Structural and Electrochemical Properties of Li1.2Ni0.16Mn0.54Co0.08O2 - Al2O3 Composite Prepared by Atomic Layer Deposition as the Cathode Material for LIBs
Miaomiao Zhou, Jianjun Zhao, Shitao Qiu, Feng Tian, Оleksandr Potapenko, Shengwen Zhong, Hanna Potapenko, Liang Zhao
Abstract
The atomic layer deposition (ALD) technique is used to coat Al 2 O 3 on the lithium-rich cathode material Li 1.2 Ni 0.16 Mn 0.56 Co 0.08 O 2 . Coating impacts on bulk and local structure changes are investigated by XRD method. SEM images indicate that the surface of the Li 1.2 Ni 0.16 Mn 0.56 Co 0.08 O 2 covered by Al 2 O 3 has been protected from dissolution of cathode material and the modification of surface leads to formation of relatively rough layers of particles of Li 1.2 Ni 0.16 Mn 0.56 Co 0.08 O 2 -Al 2 O 3 composite. The initial capacity of coated Li 1.2 Ni 0.16 Mn 0.56 Co 0.08 O 2 cycled at 0.2C was 230 mAh∙g-1 and a capacity retention of 93.6% was achieved after 100 cycles. Comparing the performance of uncoated Li-rich phase, there are significant improvements attributed to the Al 2 O 3 ALD process without significantly affecting high rate applications. Thus, the ALD technique could be a feasible pathway for improved cycling for high capacity LIBs.