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

A Li2MoO4-coated LiNi0.8Co0.1Mn0.1O2 cathode material was successfully synthesized by introducing Mo source during the lithium mixing process. The influence of Li2MoO4-coating on the structure, morphology, and electrochemical performance related to LiNi0.8Co0.1Mn0.1O2 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 LiNi0.8Co0.1Mn0.1O2 are smaller than the virgin material. Meanwhile, the capacity retention of LiNi0.8Co0.1Mn0.1O2 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 LiNi0.8Co0.1Mn0.1O2 material. The improvement of the electrochemical performance for LiNi0.8Co0.1Mn0.1O2 is mainly due to the existence of the Li2MoO4 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.

Automated summary

A Li2MoO4-coated LiNi0.8Co0.1Mn0.1O2 cathode material was successfully synthesized by introducing Mo source during the lithium mixing process. The coating improved the electrochemical performance of LiNi0.8Co0.1Mn0.1O2, enhancing its cycling stability and reducing electrode polarization and irreversible capacity. The presence of the Li2MoO4 protective shell also led to the formation of a thinner solid electrolyte interface (SEI) film on the material, further improving its performance.