湿法冶金2025，Vol.44Issue(6)：740-748,9.DOI:10.13355/j.cnki.sfyj.2025.06.005
Li0.08La0.64Nb2O6锂离子电池负极材料的制备及其电化学性能研究
Preparation and Electrochemical Performance of Li0.08La0.64Nb2O6 Anode Material for Lithium-ion Batteries
摘要
Abstract
The synthesis of micrometer-sized Li0.08La0.64Nb2O6 anode material for lithium-ion batteries via a high-temperature solid-phase method was investigated and its structure and electrochemical properties were analyzed and discussed by X-ray powder diffraction(XRD)and cyclic voltammetry(CV).Structural characterization reveals that the material crystallizes in an orthorhombic system(space group Pmmm)and its ordered A-site defect layers,synergistically coupled with the rigid[NbO6]octahedral framework,construct percolating lithium-ion transport channels.Electrochemical testing results demonstrate that at a current density of 0.05 A/g,the material delivers a discharge specific capacity of 355.57 mAh/g after 100 cycles,with a capacity retention rate of 94.4％.The capacity retention remains at 84.9％after 3 000 cycles at a high rate of 1 A/g.Analysis of the pseudocapacitive contribution indicates a pseudocapacitive contribution rate of 88％at a scan rate of 1 mV/s.The kinetic index b ranges from 0.771 to 0.895,confirming that its charge storage mechanism is predominantly surface-controlled pseudocapacitance.Galvanostatic intermittent titration technique(GITT)measurements yield a lithium-ion diffusion coefficient of 5.79×10-11 cm2/s,indicating excellent ion transport capability.The research results can provide theoretical references for the development of A-site defective niobium-based perovskite materials and their application in lithium-ion batteries.关键词
锂离子电池/微米级负极材料/A位缺陷钙钛矿/赝电容/电化学性能Key words
lithium-ion battery/micrometer-sized anode material/A-site defect perovskite/pseudocapacitance/electrochemical performance分类
矿业与冶金引用本文复制引用
廖洁,李中林,卢锋奇..Li0.08La0.64Nb2O6锂离子电池负极材料的制备及其电化学性能研究[J].湿法冶金,2025,44(6):740-748,9.基金项目
国家自然科学基金资助项目(22269006). （22269006）
