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

• Main Authors: Liang, Chengdu, Su, Shuojian, Guo, Yongsheng, Wang, Xiqing, Wang, Ying
• Format: Patent
• Language: English
• Published: 12.03.2020
• Subjects: AMMONIA; BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOUNDS THEREOF; CYANOGEN; ELECTRICITY; INORGANIC CHEMISTRY; METALLURGY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

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 AxMc[M′(CN)6]1-y(b-H2O)6y-dLd.□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; 0<x≤2; 0<c≤1; 0<y<1; 0<d≤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.