Nanometer spherical lithium iron phosphate positive electrode material and preparation method thereof

The invention discloses a nanometer spherical lithium iron phosphate positive electrode material and a preparation method thereof, and belongs to the technical field of lithium ion batteries. The positive electrode material comprises lithium iron phosphate and carbon coating the lithium iron phosphate; the iron site of the lithium iron phosphate is doped with aluminum, and the microstructure of the lithium iron phosphate positive electrode material is spherical particles. The aluminum alkoxide can effectively reduce the unit cell volume of the material, increase the stability in the crystal, improve the specific discharge capacity and structural stability of the material, and control the morphology of the precursor; the transmission path of lithium ions is shortened, the conductivity is improved, and the compaction density of the battery is also improved. 本发明公开了一种纳米球形磷酸铁锂正极材料及其制备方法，属于锂离子电池技术领域。所述正极材料包括：磷酸铁锂和包覆所述磷酸铁锂的碳；所述磷酸铁锂的铁位掺杂有铝，所述磷酸铁锂正极材料的微观结构为球形颗粒。本发明中铝醇盐的存在能够有效降低材料的晶胞体积，增加晶体内部的稳定性，提升了材料的放电比容量和结构稳定性控制前躯体