POSITIVE ELECTRODE MATERIAL, POSITIVE ELECTRODE SHEET AND LITHIUM ION BATTERY

A positive electrode material is obtained by mixing a lithium manganese iron phosphate material and a ternary material. During mixing, a mass ratio n of the ternary material to the lithium manganese iron phosphate material in the positive electrode material is determined according to a range of a ratio k of an actual specific capacity of the ternary material to an actual specific capacity of the lithium manganese iron phosphate material. Specifically, when k is less than or equal to 1.34, n is 1 to 9; and when k is greater than 1.34, n is 0.1 to 1.