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

摘要

The present disclosure provides a prussian blue analogue positive electrode material, a preparation method therefor and an electrochemical energy storage device. A molecular formula of the prussian blue analogue positive electrode material is A_xM_c[M′(CN)₆]_1-y(b-H₂O)_6y-dL_d.□_y.(i-H₂O)_z, where, A is one or more selected from a group consisting of alkali metal cation, alkaline-earth metal cation, Zn²⁺ and Al³⁺; M is a metal with the valence of 2+ or 3+; M′ is a metal with the valence of 2+ or 3+; b-H₂O is a coordinated water; □ is a M′(CN)₆ cavity; L is a neutral ligand, the neutral ligand is one or more selected from a group consisting of CH₃CN, NH₃, CO and C₅H₅N; i-H₂O is an interstitial water; 0x≤2; 0c≤1; 0y1; 0d≤6y; 0≤z≤16. In the prussian blue analogue positive electrode material of the present disclosure, the neutral ligand L participates in the coordination with a transition metal and substitutes the coordinated water partly or wholly, so that a content of the coordinated water is decreased or even eliminated, therefore, the water absorption performance of the prussian blue analogue positive electrode material will be decreased significantly, in turn the performance of the electrochemical energy storage device is significantly improved.