▎ 摘　　要

NOVELTY - Anode material has a core-shell structure, where the inner core is formed by active material particles (I), and the outer shell is formed by functional material particles, where Me includes at least one of iron, copper, cobalt, aluminum, magnesium, zirconium and titanium, and the values of x, y and z satisfy the chemical formula charge balance. The particle size of the active material particles is micron order. The functional material particles include metal oxide particles and fluorinated graphene particles, and the particle size of the functional material particles is nano level. USE - Anode material is useful in pole piece of a sodium ion battery. ADVANTAGE - The anode material has better cycle performance, rate performance and safety performance. The preparation method is simple and easy to operate. DETAILED DESCRIPTION - Anode material has a core-shell structure, where the inner core is formed by active material particles of formula NaxNiyMezO2 (I), and the outer shell is formed by functional material particles, where Me includes at least one of iron, copper, cobalt, aluminum, magnesium, zirconium and titanium, and the values of x, y and z satisfy the chemical formula charge balance. The particle size of the active material particles is micron order. The functional material particles include metal oxide particles and fluorinated graphene particles, and the particle size of the functional material particles is nano level. x = more than 0, y = 0.5-1, y+z = 1. INDEPENDENT CLAIMS are included for: a pole piece; and a sodium ion battery.