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Influence of Na and Nb co-substitution on electrochemical performance of ternary cathode materials for Li-ion batteries
New Journal of Chemistry ( IF 3.3 ) Pub Date : 2018-01-15 00:00:00 , DOI: 10.1039/c7nj03756b Milad Ghorbanzadeh 1, 2, 3, 4 , Saeed Farhadi 1, 2, 3, 4 , Reza Riahifar 1, 2, 3, 4 , S. M. M. Hadavi 4, 5, 6
New Journal of Chemistry ( IF 3.3 ) Pub Date : 2018-01-15 00:00:00 , DOI: 10.1039/c7nj03756b Milad Ghorbanzadeh 1, 2, 3, 4 , Saeed Farhadi 1, 2, 3, 4 , Reza Riahifar 1, 2, 3, 4 , S. M. M. Hadavi 4, 5, 6
Affiliation
In the present study, Li1−xNax(Ni0.6Co0.2Mn0.2−yNby)O2, a novel layered cathodic compound, is synthesized using an economically feasible polymer pyrolysis method. Microstructure, morphology and electrochemical properties of the synthesized compounds are studied by XRD, SEM, charge–discharge tests, cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The results reveal that substitution of Nb and Na can improve the cycling properties. The replacement of Nb can play an important role in improving maintenance capacity and cycling behavior. In addition, the Li-ion diffusability is significantly improved as a result of Na doping, which can be related to the reduction in Li+/Ni2+ cation mixing and its ionic radius. The highest retention percentage of 94.3% and discharge capacity were achieved for the sample containing Na = 0.03 and Nb = 0.02.
中文翻译:
Na和Nb共取代对锂离子电池三元正极材料电化学性能的影响
在本研究中,Li 1- x Na x(Ni 0.6 Co 0.2 Mn 0.2- y Nb y)O 2,一种新型的层状阴极化合物,是使用经济可行的聚合物热解方法合成的。通过XRD,SEM,充放电测试,循环伏安法(CV)和电化学阻抗谱(EIS)研究了合成化合物的微观结构,形态和电化学性能。结果表明,Nb和Na的取代可以改善循环性能。Nb的替代可以在提高维护能力和循环性能方面发挥重要作用。此外,Na掺杂可显着改善锂离子的扩散性,这可能与Li + / Ni 2+的减少有关阳离子混合及其离子半径。Na = 0.03和Nb = 0.02的样品的保留率最高,达到94.3%。
更新日期:2018-01-15
中文翻译:
Na和Nb共取代对锂离子电池三元正极材料电化学性能的影响
在本研究中,Li 1- x Na x(Ni 0.6 Co 0.2 Mn 0.2- y Nb y)O 2,一种新型的层状阴极化合物,是使用经济可行的聚合物热解方法合成的。通过XRD,SEM,充放电测试,循环伏安法(CV)和电化学阻抗谱(EIS)研究了合成化合物的微观结构,形态和电化学性能。结果表明,Nb和Na的取代可以改善循环性能。Nb的替代可以在提高维护能力和循环性能方面发挥重要作用。此外,Na掺杂可显着改善锂离子的扩散性,这可能与Li + / Ni 2+的减少有关阳离子混合及其离子半径。Na = 0.03和Nb = 0.02的样品的保留率最高,达到94.3%。