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Surface Modification and Electrochemical Performance of Al 2 O 3 Coated and Ni-Doped Spinel LiMn 2 O 4 for Aqueous Rechargeable Battery Applications
Surface Engineering and Applied Electrochemistry Pub Date : 2020-09-02 , DOI: 10.3103/s1068375520040122
S. Pavithra , P. Sivaraj , P. Arjunan , S. Prabhu , R. Ramesh , P. Yuvaraj , N. Sivakumar

Abstract

This work reports the synthesis and electrochemical performance of the nickel-doped lithium manganese oxide along with the surface modification of the mentioned oxide coated with the aluminum oxide via a solid state route. The structural and functional groups were confirmed by the X-ray powder diffraction and Raman spectroscopy studies, respectively. A pyramid-like structure of the pure lithium manganese oxide and a plate-like structure of lithium manganese nickel oxide coated by Al2O3 were confirmed by the field emission scanning electron microscopy. The exchange current density and the charge transfer resistance were calculated via electrochemical impedance spectroscopy in an aqueous electrolyte system. In that system, the electrochemical behaviour of the lithium manganese oxide, of the lithium manganese nickel oxide, and of the Al2O3 coated lithium manganese nickel oxide was studied by the charge/discharge analysis. The Al2O3 coated lithium manganese nickel oxide exhibits 91% capacity retention up to 100 charge/discharge cycles as well as a lower charge transfer resistance which are far better than previously reported values.


中文翻译:

Al 2 O 3涂层和掺Ni尖晶石LiMn 2 O 4的表面修饰和电化学性能

摘要

这项工作报道了镍掺杂的锂锰氧化物的合成和电化学性能,以及上述通过固态途径涂覆有氧化铝的氧化物的表面改性。通过X射线粉末衍射和拉曼光谱研究分别证实了结构和官能团。纯锂锰氧化物的金字塔状结构和涂有Al 2 O 3的锂锰镍氧化物的板状结构由场发射扫描电子显微镜证实。交流电流密度和电荷转移电阻是通过电化学阻抗谱在含水电解质系统中计算的。在该系统中,通过充电/放电分析研究了锂锰氧化物,锂锰镍氧化物和Al 2 O 3涂覆的锂锰镍氧化物的电化学行为。Al 2 O 3涂层的锰酸锂锰镍氧化物在100次充放电循环中显示91%的容量保持率,并且电荷转移电阻更低,远优于先前报道的值。
更新日期:2020-09-02
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