Zinc-containing cathode material for sodium ion battery and preparation method and application thereof

Abstract

The present invention discloses a cathode material for a sodium ion battery and a preparation method and application thereof. The general chemical formula of the cathode material is Na1+aMyZnxO2+c, where −0.40≤a≤0.25, 0.1<x≤0.22, 0.78<y≤0.93, −0.3<c<0.3. M is one or a combination of two or more selected from the group consisting of Mn, Fe, Ni, Co, Al, Zr, Y, Ca, Li, Rb, Cs, W, Ce, Mo, Ba, Ti, Mg, Ta, Nb, V, Sc, Sr, B and Cu. In the powder X-ray diffraction graph, there are at least five diffraction peaks exist when 2θ is 30°-40°. A minor strong peak exist when 2θ is around 16° and a major strong peak exists when 2θ is around 41°. The sodium ion cathode material of the present invention has a low residual alkali content and avoids the occurrence of gelation phenomenon in the battery slurrying process. In addition, the capacity and rate of the sodium ion battery prepared therefrom are at a relatively high level.

Dependencies are inferred from the claim text.