Doping modified lithium iron phosphate material, preparation method thereof and lithium ion battery

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a doped modified lithium iron phosphate material and a preparation method thereof, and a lithium ion battery, the doped modified lithium iron phosphate material comprises: a doped lithium iron phosphate core; the surface of the doped lithium iron phosphate inner core is coated with the carbon coating layer; the doped lithium iron phosphate core is lithium iron phosphate co-doped with B and M, M represents a doped metal element and is selected from at least one of Ti, Nb and Al, and B represents a boron element. According to the invention, the element B and other elements (at least one of Ti, Nb and Al) are co-doped into the lithium iron phosphate, so that the rate capability of the carbon-coated lithium iron phosphate material is improved. 本发明属于锂离子电池技术领域，具体涉及一种掺杂改性的磷酸铁锂材料及其制备方法、锂离子电池，所述掺杂改性的磷酸铁锂材料包括：掺杂型磷酸铁锂内核；以及碳包覆层，包覆在所述掺杂型磷酸铁锂内核的表面；所述掺杂型磷酸铁锂内核为B和M共掺杂的磷酸铁锂，其中，M代表掺杂金属元素，选自Ti、Nb、Al中的至少一种，B代表硼元素。本发明通过将B元素和其他元素(Ti、