Spherical Agglomeration of Octahedral LiNi 0.5 Co 4 x Mn 1.5–3 x O 4 Cathode Material Prepared by a Continuous Coprecipitation Method for 5 V Lithium-Ion Batteries

Octahedral LiNi 0.5 Mn 1.5 O 4 with excellent electrochemical properties prepared by the solvothermal or sol–gel method under harsh conditions is expensive. Therefore, preparing octahedral LiNi 0.5 Mn 1.5 O 4 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 LiNi 0.5 Co 4 x Mn 1.5–3 x O 4 with micrometer sizes were synthesized by a continuous coprecipitation process. Compared to conventional spherical LiNi 0.5 Mn 1.5 O 4, the spherical agglomeration of octahedral LiNi 0.5 Co 0.08 Mn 1.44 O 4 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 LiNi 0.5 Co 0.08 Mn 1.46 O 4 exhibited a negligible decrement after 100 cycles at 1C, displaying great potential industrial application for 5 V lithium-ion batteries.