Cathode Material and Preparation Method Thereof, and Cathode Plate and Sodium-Ion Battery

Abstract

The present application belongs to the technical field of sodium-ion batteries. Provided are cathode material and preparation method thereof, and cathode plate and sodium-ion battery. The cathode material includes a Prussian Blue material, and a molecular formula of the Prussian Blue material is NaxFeyFe(CN)zF6-z·nH2O·mHCl, where 1.90≤x≤2.20, 0.9≤y≤1.2, 4.20≤z≤5.50, 1.00≤n≤1.75, and 0.001≤m≤0.007. According to the present disclosure, the structure stability of the cathode material is improved, and an efficient diffusion channel of sodium ions is optimized at the same time, thereby improving a sodium storage capacity and cycling stability. Through a synergistic effect between the ions, the problem of a high content of crystal water in the cathode material is solved, the structure stability of the cathode material and the stability of electrochemical sodium storage performance are improved, and production costs are also reduced, thereby expanding an application range of sodium-ion batteries.

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