CONNECTION FOR ELECTRODE MATERIAL OF METAL-ION BATTERIES, ELECTRODE MATERIAL BASED ON IT, ELECTRODE AND BATTERY BASED ON ELECTRODE MATERIAL Russian patent published in 2020 - IPC H01M4/48 H01M10/54 

FIELD: electrical engineering.

SUBSTANCE: invention relates to electrical engineering and specifically to development of a new type of electrode material based on transition and alkali metal pyrophosphates for metal-ion batteries for use in secondary current sources. As electrode material for metal-ion accumulators based on pyrophosphates of transition and alkali metals new compound with general formula is taken A _1+δ(V_1-xM_x)P₂O₇, where A is alkali metal cation (Na, Li, K, Rb) and mixture thereof; -1 <δ<1, 0≤x <1, M – Cr, Fe, Mn, Co, Ni, Mg, Zn, Al, Ga and mixture thereof, characterized by a crystalline structure of the KAlP₂O₇ type, previously not known and not used in combination with alkali metal Na in materials for metal-ion batteries. Synthesis of compound NaVP₂O₇ is carried out by forming a new compound NaV(HPO₄)₂, also previously not known and not used for production of electrode materials.

EFFECT: high specific energy capacity (more than 390 W*h/kg), cycling stability, ease of production, ability to work at high cycling speeds (over 10 °C), development of a unique method for synthesis thereof.

10 cl, 11 dwg, 3 ex, 1 tbl