Inhibition of excessive SEI-forming and improvement of structure stability for LiNi0.8Co0.1Mn0.1O2 by Li2MoO4 coating

A Li 2 MoO 4 -coated LiNi 0.8 Co 0.1 Mn 0.1 O 2 cathode material was successfully synthesized by introducing Mo source during the lithium mixing process. The influence of Li 2 MoO 4 -coating on the structure, morphology, and electrochemical performance related to LiNi 0.8 Co 0.1 Mn 0.1 O 2 has been studied. The results of the cyclic voltammetry (CV) and differential voltage curve measurement show that the electrode polarization and irreversible capacity of the modified LiNi 0.8 Co 0.1 Mn 0.1 O 2 are smaller than the virgin material. Meanwhile, the capacity retention of LiNi 0.8 Co 0.1 Mn 0.1 O 2 increases from 64.6 to 90.59% after the 100th cycle at 1 C (1 C=200 mA g −1 ). Additionally, compared with the recycled materials, a thinner solid electrolyte interface (SEI) film was formed on the modified LiNi 0.8 Co 0.1 Mn 0.1 O 2 material. The improvement of the electrochemical performance for LiNi 0.8 Co 0.1 Mn 0.1 O 2 is mainly due to the existence of the Li 2 MoO 4 protective shell that improves the structural stability of the core material, avoids direct contact between the electrolyte and the active material, and suppresses the occurrence of side reaction.