人工晶体学报2024，Vol.53Issue(1)：145-153,162,10.
Cu掺杂P2型Na0.67Ni0.33Mn0.67O2钠离子电池正极材料的制备与性能
Synthesis and Performance of Cu Doping P2-Type Na0.67Ni0.33Mn0.67O2 Used as Cathode Material for Sodium Ion Batteries
摘要
Abstract
A series of Cu-doped layered P2-type Na0.67Ni0.33-xCuxMn0.67 O2(x=0,0.05,0.10,0.15,0.20,0.25)with regular morphology and smooth surface were synthisized by sol-gel method.The morphology,structure and composition of those materials were characterized using SEM,XRD,EDS and XPS technologies,and their electrochemical properties were investigated by cyclic voltammetry and constant current charge-discharge methods through using them as cathode materials for sodium ion batteries.The optimum doping ratio was obtained.It is found that doping did not change the layered structure and morphology of the materials.Those materials exhibit good cycling stability and multiplicative performance due to the introduction of highly electrochemically active Cu2+as a substituent and the increase of the surface active sodium storage sites.In the voltage range of 2.0 V to 4.3 V and a multiplicity of 0.1 C,the initial discharge specific capacity of Na0.67Ni0.18Cu0.15Mn0.67O2(with Cu doped ratio of 0.15)has an initial discharge specific capacity of 126.74 mAh/g and a capacity retention rate of 79.10％after 100 cycles,which is 50.92％higher than that of the undoped material.The enhanced electrochemical properties of the material are attributed to the insertion of Cu2+into the transition metal layer,and the radius of Cu2+(0.73 Å)is larger than that of Ni2+(0.69 Å),which widens the transition metal layer spacing and provides channels for Na+diffusion,and in turn increases the Na+diffusion rate.When charged to high voltage,the Na+vacancy generation during Na+de/embedding process is inhibited,thus the crystal structure of the material is stabilized,the P2-O2 phase transition is suppressed,and the cycling stability is improved.关键词
钠离子电池正极材料/溶胶-凝胶法/Cu掺杂/Na0.67Ni0.33Mn0.67O2/层状氧化物/循环稳定性Key words
cathode material for sodium ion battery/sol-gel method/Cu doping/Na0.67Ni0.33Mn0.67O2/layered oxide/cycling stability分类
通用工业技术引用本文复制引用
刘辉,闫共芹,蓝春波,张子杨..Cu掺杂P2型Na0.67Ni0.33Mn0.67O2钠离子电池正极材料的制备与性能[J].人工晶体学报,2024,53(1):145-153,162,10.基金项目
广西自然科学基金(2020GXNSFAA159024) （2020GXNSFAA159024）
