ИСТИНА

NASICON-type Na3V2(PO4)3 electrode materials are considered as promising candidates for high-performance Na-ion batteries due to extremely long cyclic life and an outstanding ability to operate at high (dis)charge rates. The replacement of V with Mn and Cr in Na3V2(PO4)3 enhances the operation voltage and lowers the cost of the cathode materials. Substitution of V by electrochemically inactive Mg and Sc allows studying vanadium redox processes without contributions from other transition metals. The replacement of V with Ti and Nb in Na3V2(PO4)3 decreases the operation voltage and allows to use them as anode materials for safe Na-ion batteries. Further, NaNbV(PO4)3 exhibits a reversible three-electron process, corresponding to the Nb5+/4+, V3+/2+, and Nb4+/3+ redox couples, and delivers a high specific capacity of 180 mAh·g-1 at an average working potential of 1.55 V vs. Na/Na+ [1]. Figure 1 Comparison of galvanostatic charge curves of NASICON compounds with different composition The experimental results will be presented to indicate the benefits of vanadium-substituted NASICON compounds. This work was supported by the Russian Science Foundation (Grant No. 17-73-30006-P). References: 1. Khasanova, N. R., Panin, R. V., Cherkashchenko, I. R., Zakharkin, M. V., Novichkov, D. A., Antipov, E. V // ACS Appl. Mater. Interfaces 2023, 15, 25, 30272–30280.