Hybrid CoMoO₃/CoMoO₄ nanorods for enhanced lithium-ion battery performance

Electrode materials that rely on conversion reactions for lithium-ion batteries (LIBs) possess high energy densities. However, a key issue in their design is bolstering their stability and minimizing volume variations during lithiation and delithiation. Herein, an effective strategy was devised to fulfill the fully reversible conversion reaction for lithium storage in CoMoO₄ through the hybridization of CoMoO₃. CoMoO₃/CoMoO₄ with a nanorod structure was synthesized via one-step annealing treatment after a solvothermal process. In such a structure, the CoMoO₃/CoMoO₄ nanorod can considerably boost mechanical robustness and offer ample space to counteract volume fluctuations throughout successive cycles owing to the cooperative interaction between CoMoO₃ and CoMoO₄. CoMoO₃/CoMoO₄ exhibited superior lithium-storage capacity (919.6 mAh/g at 0.1 A/g after 200 cycles) and cycling stability (683.4 mAh/g at 1 A/g after 600 cycles). CoMoO₃/CoMoO₄ showed a high potential as an anode material for LIBs.