文摘
Octahedral LiNi0.5Mn1.5O4 with excellent electrochemical properties prepared by the solvothermal or sol–gel method under harsh conditions is expensive. Therefore, preparing octahedral LiNi0.5Mn1.5O4 with good granularity by a more cost-effective and large-scale method is significant for its industrial applications. In this study, spherical agglomerations of octahedral Co-doped LiNi0.5Co4xMn1.5–3xO4 with micrometer sizes were synthesized by a continuous coprecipitation process. Compared to conventional spherical LiNi0.5Mn1.5O4, the spherical agglomeration of octahedral LiNi0.5Co0.08Mn1.44O4 with a larger specific surface area and pore volume was well crystallized without any impurities and exhibited a high discharge capacity of about 110 mAh·g–1 at a rate of 2C and a high reversible capacity of 99.9% after the rate test (in which rates of 0.1C, 0.5C, 1C, and 2C were tested sequentially for 10 cycles). Remarkably, the discharge capacity of the prepared LiNi0.5Co0.08Mn1.46O4 exhibited a negligible decrement after 100 cycles at 1C, displaying great potential industrial application for 5 V lithium-ion batteries.