Li2O–V2O5–MoO3–Fe2O3 amorphous cathode material for lithium-ion batteries based on coordinated multi-electron effect and stable network structure.

The amorphous cathode materials Li 2 O–V 2 O 5 –MoO 3 and Li 2 O–V 2 O 5 –MoO 3 –Fe 2 O 3 were produced via melt quenching. By analyzing the structure, elemental valence, and electrochemical characteristics of Li 2 O–V 2 O 5 –MoO 3 at different ratios, the effects of MoO 3 addition on vanadium-based amorphous cathode materials were explored. 20Li 2 O–60V 2 O 5 –20MoO 3 has a high initial capacity (268.0 mAh/g for the first reversible discharge at a current density of 50 mA/g), which is based on the properties that MoO 3 supplies additional oxidation reductions and has [MoO6] structural units to widen the diffusion channels for lithium ions in the network structure. Unfortunately, the network of the structural elements [MoO6] and [VO4] is unstable, which causes the material to have poor cycle stability and exhibit an unsatisfactory current response. The network structure stability of Li 2 O–V 2 O 5 –MoO 3 –Fe 2 O 3 is increased by adding Fe 2 O 3 to provide [FeO4], which strengthens the link between each structural unit. Vanadium oxidation reductions are promoted, and iron oxidation reductions replace the role of molybdenum in the charge/discharge. The discharge product transforms from LiVMoO 5 to Li 2 FeV 3 O 8 with increased de-embedding Li efficiency. The 20Li 2 O–60V 2 O 5 –10MoO 3 –10Fe 2 O 3 achieves an initial reversible specific capacity of 255.2 mAh/g at 50 mA/g, 139.7 mAh/g additional specific capacity after 100 cycles, and 110.5 mAh/g specific capacity at a high current density of 400 mA/g. The test findings show that 20Li 2 O–60V 2 O 5 –10MoO 3 –10Fe 2 O 3 efficiently increases high-current responsiveness and cycle stability while retaining a high capacity. In this study, we propose a compositional design strategy, which is based on the coordinated multi-electronic effect of multiple transition metal elements and the design of a stable disordered network structure, to incorporate MoO 3 and Fe 2 O 3 into vanadium-based amorphous to create a novel cathode material. This work offers a fresh perspective on investigating innovative lithium-ion battery cathode materials. [ABSTRACT FROM AUTHOR]