中南大学学报（自然科学版）2025，Vol.56Issue(3)：891-898,8.DOI:10.11817/j.issn.1672-7207.2025.03.007
Li/Cu共掺杂制备长循环寿命镍铁锰基正极材料
Preparation of NiFeMn-based anode materials with long cycle life by Li/Cu co-doping
摘要
Abstract
In order to investigate the effects of Li/Cu co-doping on the physical phase composition,micro-morphology,compositional valence and electrochemical properties of layered oxide materials,P2 phase materials of layered oxides for sodium ion batteries were prepared by solid-phase method.The results show that Li/Cu is successfully doped into the material lattice during the high-temperature solid-phase reaction,and the P2 phase has a complete P63/mmc spatial structure and exhibits a smooth hexagonal lamellar morphology.The reduction of Mn3+content effectively suppresses the Ginger-Taylor phenomenon during the cycling process of the materials and improves the structural stability of the materials.The P2-phase materials also exhibit excellent cycling stability and multiplicity performance in terms of electrochemical properties.At the doping amount x=0.04,the materials have a capacity retention of 95.46%for 200 cycles at 90 mA·g-1 current density in the voltage range of 2.0-4.2 V,and still has a discharge specific capacity of 92.0 mA·h·g-1 at 900 mA·g-1 current density.By designing a suitable Li/Cu co-doping ratio,the charge transfer impedance Rct of the materials can be effectively reduced,which can further enhance the electrochemical performance of the P2 phase materials.关键词
钠离子电池/层状氧化物/P2相/Li/Cu共掺杂/长循环寿命Key words
sodium-ion battery/layered oxide/P2 phase/Li/Cu co-doping/long cycle life分类
动力与电气工程引用本文复制引用
吴成龙,李荐,王利华,陈永志..Li/Cu共掺杂制备长循环寿命镍铁锰基正极材料[J].中南大学学报（自然科学版）,2025,56(3):891-898,8.基金项目
国家自然科学基金青年基金资助项目(52205054) （52205054）
2023年度长沙市科技重大专项项目(kh2401022)(Project(52205054)supported by the National Natural Science Foundation of China （kh2401022）
Project(kh2401022)supported by Changsha Science and Technology Major Special Project in 2023) （kh2401022）
