▎ 摘　　要

NOVELTY - Pure-phase polyanionic sulfate sodium ion battery cathode material comprises sodium-metal-metal sulfate compound (I), is new USE - Pure-phase polyanionic sulfate sodium ion battery anode for secondary battery. Uses include e.g. lead-acid battery, nickel-hydrogen battery and nickel-cadmium battery. ADVANTAGE - (I) has good structure stability, excellent multiplying power performance, good cycle performance, simple preparation method and low characteristics. DETAILED DESCRIPTION - Pure phase polyanionic sulfate sodium ion battery cathode material of formula NaxMyAzSO4 (I), is new. M is manganese, iron, cobalt, nickel, copper, and/or zinc; A is lithium, potassium, and/or sodium; and x = 0.75-0.85, y = 0.52-0.58, z = 0-0.1, and x + 2y + z = 2. An INDEPENDENT CLAIM is also included for a method for preparing the pure-phase polyanionic sulfate sodium ion battery anode.