Hybrid CoMoO3/CoMoO4 Nanorods for Enhanced Lithium-Ion Battery Performance

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