Cathode material and preparation method therefor, cathode sheet and sodium-ion battery

Abstract

Provided are a cathode material and a preparation method therefor, a cathode sheet and a sodium-ion battery. The cathode material includes a composite particle, a molecular formula of the composite particle is Na4MxMn1-x/2V(PO4)3-x/3Nx, wherein 0.001≤x≤0.05, M is Li and/or K, and N is selected from one or more of F, Cl, Br, and I. According to the present disclosure, by synchronously introducing specific types and contents of anions and cations into a polyanionic phosphate active cathode material to achieve a good synergistic effect between the anions and cations, the particle morphology and size of the material are regulated while the intrinsic conductivity and structural stability of the cathode material are greatly improved, and significant improvement of the comprehensive performance, such as specific capacity, rate capability, cycle stability and compaction density, of the material is promoted.

Dependencies are inferred from the claim text.