通过Nb2O5包覆提升Na3V2(PO4)3正极的储钠性能OA
Unlocking the performance of sodium-ion batteries by coating Na3V2(PO4)3 with Nb2O5
Na3V2(PO4)3(NVP)因其NASICON型框架结构可实现高效可逆的钠离子脱嵌,因此被认为是一种极具前景的钠离子电池正极材料.然而,其实际性能受限于高倍率下的缓慢电荷转移和循环稳定性不足.本研究采用简易浸渍法在NVP颗粒表面沉积Nb2O5,旨在提升材料的高倍率性能和长循环稳定性.结构与光谱分析(XRD、电子显微镜、拉曼光谱、XPS和X射线荧光光谱)证实包覆后NVP仍保持良好的结晶性,且Nb2O5均匀分布于颗粒表面而不影响钠离子的可逆脱嵌.电化学测试表明,与未包覆样品相比,Nb2O5包覆样品中Na+扩散系数显著提高,从而提升了高倍率性能和循环稳定性,其中3%Nb2O5包覆样品表现出最高的扩散系数和最优异的循环稳定性.循环伏安和阻抗测试结果表明,包覆样品的表面电容增强,从而促进了钠离子的快速存储.XPS结果显示Nb2O5可清除电解液中的痕量HF,避免了其对NVP电极结构的破坏.长循环测试验证了包覆电极结构的长期稳定性.这些结果表明,Nb2O5包覆是解决NVP电极本征缺陷的有效策略,为开发高性能钠离子电池提供了可行途径.
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.
José Luis Tirado;Carlos Pérez-Vicente;Fabiana Villela da Motta;Pedro Lavela;Mauricio Bomio;Sergio Lavela
Departamento de Química Inorgánica e Ingeniería Química.Instituto Universitario de Energía y Medio Ambiente.Edificio Marie Curie.Universidad de Córdoba.Campus de Rabanales 14071 Córdoba,SpainDepartamento de Química Inorgánica e Ingeniería Química.Instituto Universitario de Energía y Medio Ambiente.Edificio Marie Curie.Universidad de Córdoba.Campus de Rabanales 14071 Córdoba,SpainLSQM-Laboratory of Chemical Synthesis of Materials,Department of Materials Engineering,Federal University of Rio Grande do Norte-UFRN,Natal,RN 59078-970,BrazilDepartamento de Química Inorgánica e Ingeniería Química.Instituto Universitario de Energía y Medio Ambiente.Edificio Marie Curie.Universidad de Córdoba.Campus de Rabanales 14071 Córdoba,SpainLSQM-Laboratory of Chemical Synthesis of Materials,Department of Materials Engineering,Federal University of Rio Grande do Norte-UFRN,Natal,RN 59078-970,BrazilDepartamento de Química Inorgánica e Ingeniería Química.Instituto Universitario de Energía y Medio Ambiente.Edificio Marie Curie.Universidad de Córdoba.Campus de Rabanales 14071 Córdoba,Spain
化学化工
钠离子电池包覆钠超离子导体铌
Sodium-ion batteryCoatingNASICONNiobium
《物理化学学报》 2026 (2)
145-161,17
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)and the Regional government of"Junta de Andalucía"(group FQM288)and excellence project no.0001020as 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,respectivelyCoordination for the Improvement of Higher Education Personnel(CAPES)-Brazil with Finance Code 001.
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