有色金属科学与工程2025，Vol.16Issue(3)：347-356,10.DOI:10.13264/j.cnki.ysjskx.2025.03.003
晶相调控对Li3NbO4电化学性能的影响
Effect of crystal phase regulation on Li3NbO4 electrochemical performance
摘要
Abstract
The lithium content of Li3NbO4 is richer than that of ternary cathode materials.Adding Li3NbO4 to the ternary cathode materials can play a certain role in lithium supplementation,reduce the irreversible capacity of the battery and improve its cycle performance.However,the low room temperature ionic conductivity of Li3NbO4 limits its application.It is found that in the process of synthesizing Li3NbO4,the proportion of the face-centered cubic phase(Fm-3m)and body-centered cubic phase(I-43m)in the structure of the synthesized Li3NbO4 material can be adjusted by controlling the ratio of Li/Nb.The coexistence interface of the two phases can reduce the lithium-ion diffusion energy barrier and enhance the migration ability of lithium ions.The results show that when Li∶Nb molar ratio is 3.6:1 in the composition,the I-43m phase accounts for the highest proportion of the obtained Li3NbO4 material,and the lithium-ion conductivity of the prepared sample is 35 times higher than that of the Fm-3m phase,reaching 8.35×10-6 S/cm.The obtained high ionic conductivity Li3NbO4 powder is added to the ternary anode material to make LiNi0.5Co0.2Mn0.3O2/LiPF6/Li coin cell.The resulting battery exhibits a 15%increase in specific capacity and demonstrates excellent long-cycling performance and high-rate capability.关键词
相调控/Li3NbO4/正极补锂剂/交流阻抗/离子电导率Key words
phase regulation/Li3NbO4/positive lithium supplement/Ac impedance/ionic conductivity分类
矿业与冶金引用本文复制引用
王海忠,李子蔚,孙晨铖,王伯元,谢隆兴,吴珊,张骞,韩磊..晶相调控对Li3NbO4电化学性能的影响[J].有色金属科学与工程,2025,16(3):347-356,10.基金项目
江西省教育厅科技重点资助项目(GJJ2200804) （GJJ2200804）
