LITHIUM ION BATTERY AND POWERED VEHICLE

A positive electrode plate of a lithium-ion battery includes a positive electrode material layer provided on a positive electrode current collector. A negative electrode plate of the lithium-ion battery includes a graphite negative electrode material layer provided on a negative electrode current collector. The positive electrode material layer includes a positive electrode active material consisting of a lithium manganese iron phosphate material, a lithium iron phosphate material and a ternary material with a mass ratio of A1+A2+A3=1. α=(M4×η4×Y)/[M1×η1×A1+M2×η2×A2+M3×η3×A3)×X], β=[M1×(1−η1)×A1+M2×(1−η2)×A2+M3×(1−η3)×A3]×X/[M4×(1−η4)×Y], 1.03≤α≤1.15, and 0.55≤β≤1.5, where X is the coating amount of the positive electrode active material on the positive electrode plate, and Y is the coating amount of graphite on the negative electrode plate.