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.
High-temperature lithium battery system operated between 150 and 300 °C is highly desirable to be applied in oil/gas and geothermal explorations. However, the development of cathode material for high-temperature lithium batteries is relatively sluggish. In this study, LiNi 1/3 Co 1/3 Mn 1/3 O 2 (NCM) is coated with Li 2 MoO 4 by a facile solid-state reaction between MoO 3 and surface lithium residue and the resulting composite is applied in high-temperature lithium batteries as a novel cathode material. Such a strategy can not only remove lithium residue components, but also facilitate lithium-ion transport in NCM through the resulting Li 2 MoO 4 coating layer. At 200 °C, the discharge capacity and rate capacity of Li 2 MoO 4 coated NCM are dramatically improved compared to the pristine one. At 300 °C, the electrochemical performance of 4m-NCM is better than other samples, and each sample exhibits better electrochemical performances than it is at 200 °C due to the enhanced kinetics in high temperature.
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