Comparative investigation of microporous and nanosheet LiVOPO4 as cathode materials for lithium-ion batteries

Abstract

LiVOPO₄ cathode materials are synthesized by freeze drying and spray drying methods. X-ray diffraction results reveal that the products obtained using the two methods are both in the β-LiVOPO₄ phase. SEM images demonstrate that the stacked nanosheets LiVOPO₄ were synthesized by freeze drying, whereas the microporous ones were synthesized by spray drying. Upon comparing the two methods, results indicate that the stacked nanosheets LiVOPO₄ synthesized by freeze drying exhibit much better electrochemical performance than microporous LiVOPO₄ synthesized by spray drying. The stacked nanosheets can deliver a capacity of 128.4 mA h g⁻¹ at 0.1 C, and possess favorable capacity at rates of 1 C and 2 C.