PRUSSIAN BLUE POSITIVE ELECTRODE MATERIAL, PREPARATION METHOD THEREFOR, AND ELECTROCHEMICAL ENERGY STORAGE DEVICE

摘要

The present invention provides a Prussian Blue positive electrode material, a preparation method therefor, and an electrochemical energy storage device. The molecular formula of the Prussian Blue positive electrode material is A_xM_c[M'(CN)₆]_1-y(b-H₂O)_6y-dL_d•□_y•(i-H₂O)_z. A is one or more of alkaline metal cations, alkaline earth metal cations, Zn²⁺, and Al³⁺; M is a metal of 2+ or 3+ valance; M' is a metal of 2+ or 3+ valance; b-H₂O is coordination water; □ is M'(CN)₆ hole; L is a neutral ligand, the neutral ligand being selected from one or more of CH₃CN, NH₃, CO, and C₅H₅N; i-H₂O is water in the gap; x is greater than 0 and less than or equal to 2; c is greater than 0 and less than or equal to 1; y is greater than 0 and less than 1; d is greater than 0 and less than or equal to 6y; and z is greater than or equal to 0 and less than or equal to 16. In the Prussian Blue positive electrode material of the present invention, the neutral ligand L participates in the coordination of the transition metal M, and partially or completely replaces the coordinated water, thereby reducing or even eliminating the content of the coordination water, and thus the water absorption performance of the Prussian Blue positive electrode material is significantly reduced, and in turn the performance of the electrochemical energy storage device can be significantly improved.