Internal Vanadium doping and external modification design of P2-type layered Mn-based oxides as competitive cathodes toward Sodium-ion Batteries

In this study, a composite cathode material, Na0.67Ni0.23Mn0.67V0.1O2@Na3V2O2(PO4)2F was developed by surface-coating P2-type Na0.67Ni0.23Mn0.67V0.1O2 with a thin layer of Na3V2O2(PO4)2F to enhance both the electrochemical sodium storage and material air stability. The optimized Na0.67Ni0.23Mn0.67V0.1O2@5wt%Na3V2O2(PO4)2F exhibited a high discharge capacity of 176 mA h g-1 within the 1.5-4.1 V range at a low current density of 17 mA g-1. At an increased current density of 850 mA g-1 within the same voltage window, it still delivered a substantial initial discharge capacity of 112 mAh g-1. These findings validate the significant enhancement of ion diffusion capabilities and rate performance in the P2-type Na0.67Ni0.33Mn0.67O2 material conferred by the composite cathode.PMID:38407545 | DOI:10.1002/chem.202400088

Source: Chemistry - February 26, 2024 Category: Chemistry Authors: Xin Li Xin Lai Qingquan Kong Xuguang An Jing Zhang Xiaolei Li Xiaonan Liu Weitang Yao Source Type: research