通过Nb2O5包覆提升Na3V2(PO4)3正极的储钠性能
Unlocking the performance of sodium-ion batteries by coating Na3V2(PO4)3 with Nb2O5
摘要
Abstract
Na3V2(PO4)3(NVP)is a promising cathode material for sodium-ion batteries owing to its NASICON-type framework,which enables efficient reversible sodium insertion.However,its practical performance is limited by slow charge transfer at high cycling rates and cycling instability.Here,we report a facile impregnation method to deposit Nb2O5 on NVP particles,aiming to enhance high-rate capability and long-term cycling stability.Structural and spectroscopic analyses(XRD,electron microscopy,Raman,XPS,and X-ray fluorescence spectroscopy)confirm the crystallinity of NVP and the uniform presence of Nb2O5 on particle surfaces without compromising sodium reversibility.Electrochemical measurements reveal that Nb2O5-coated samples show the highest diffusion coefficients,ensuring superior high-rate performance and cycling stability.The 3%Nb2O5 coating delivers the highest diffusion coefficients,superior cycling stability,and sustained capacity retention at a 1C rate.Cyclic voltammetry and impedance spectroscopy indicate enhanced surface capacitance,facilitating rapid sodium storage.XPS shows the conversion of Nb2O5 into NbF5,resulting from HF scavenging,which improved interfacial stability.Extended cycling tests validate the long-term durability of the coated electrode.These results demonstrate that Nb2O5 surface modification is an effective strategy to overcome the intrinsic limitations of NVP,offering a viable route to high-performance sodium-ion batteries.关键词
钠离子电池/包覆/钠超离子导体/铌Key words
Sodium-ion battery/Coating/NASICON/Niobium分类
化学化工引用本文复制引用
José Luis Tirado,Carlos Pérez-Vicente,Fabiana Villela da Motta,Pedro Lavela,Mauricio Bomio,Sergio Lavela..通过Nb2O5包覆提升Na3V2(PO4)3正极的储钠性能[J].物理化学学报,2026,42(2):145-161,17.基金项目
The Spanish authors acknowledge financial support from the PCI2023-143355 European research project,which is funded by the European Union-Agencia Estatal de Investigación,and is entitled"Mastering electrode surface to achieve ultra-high reversible capacity"(MASTER) （MASTER）
and the Regional government of"Junta de Andalucía"(group FQM288)and excellence project no.0001020 （group FQM288）
as well as Instituto Químico para la Energía y el Medioambiente(IQUEMA),UCO-SCAI,and UMA-SCAI for their technical support.The Brazilian authors thank the following research funding institutions for their financial support:Debora Ferreira dos Santos and Mauricio Bomio are grateful for the financial support from the National Council for Scientific and Technological Development(CNPq)-Finance Code 200196/2024-3 and 403335/2023-0,respectively （IQUEMA）
Coordination for the Improvement of Higher Education Personnel(CAPES)-Brazil with Finance Code 001. （CAPES）
