文献类型：期刊文献

英文题名：Ruthenium doped LiMn1.5Ni0.5O4 microspheres with enhanced electrochemical performance as lithium-ion battery cathode

作者：Zhou, Dengfeng Li, Junqi Chen, Chaoyi Chen, Can Wu, Hongming Lin, Fangchang Guo, Jianbing

第一作者：周登风;Zhou, Dengfeng

通信作者：Li, Junqi

机构：[1] College of Materials and Metallurgy, Guizhou University, Guiyang, 550025, China; [2] School of Materials and Metallurgical Engineering, Guizhou Institute of Technology, Guiyang, 550003, China; [3] National Engineering Research Center for Compounding and Modification of Polymer Materials, Guiyang, 550014, China; [4] Guizhou Material Industrial Technology Institute, Material Technology Innovation Base of Guizhou Province, Guiyang, 550014, China

第一机构：College of Materials and Metallurgy, Guizhou University, Guiyang, 550025, China

通信机构：College of Materials and Metallurgy, Guizhou University, Guiyang, 550025, China;College of Materials and Metallurgy, Guizhou University, Guiyang, 550025, China

年份：2021

卷号：32

期号：19

起止页码：23786-23797

外文期刊名：Journal of Materials Science: Materials in Electronics

收录：EI(收录号：20213610851862);Scopus(收录号：2-s2.0-85114041717)

语种：英文

外文关键词：Ruthenium compounds - Solid state reactions - X ray photoelectron spectroscopy - Crystal structure - Electric discharges - Charge transfer - Lithium - Crystal impurities - Ion exchange - Microspheres - Nickel compounds - Manganese compounds - Scanning electron microscopy - Electrochemical properties - Lithium compounds - Lithium-ion batteries - Energy dispersive spectroscopy

摘要：Ruthenium doped LiNi0.5Mn1.5O4 (LNMO) microspheres has been prepared by a simple solid-state reaction process. The as-prepared sample was characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS) and electrochemistry performance test. The sample shows a spinel crystal structure without RuO2 impurity phase, and Ru doped sample crystal plane spacing increases. Combined with EDS spectrum, it indicates that the Ru ion was doped in the LNMO and distributed homogeneously. The XPS also further confirm the existence of Ru ions, and Ru has no obvious influence on Ni and Mn elements. The SEM images show that all the samples are sphere-like, with many polyhedral particles attached to the surface. When doped with 4% Ru ion, many cavities appear on the surface to form a porous structure. Electrochemical analysis confirms that the Ru-doped sample exhibits better electrochemical properties regarding discharge capacity, cycle stability, and rate performance. The 4% Ru-doped sample owns an initial discharge capacity of 125?mAh?g?1 at 0.25C rate, with a capacity retention of 92% after 50 charge–discharge cycles. Moreover, at high current density (1C), Ru doped sample’s discharge capacity is 103?mAh?g?1 while the original is only 86?mAh?g?1. The excellent electrochemical properties are attributed to the Ru doping that increases the interlayer spacing and reduces the charge-transfer impedance (Rct), which is beneficial to lithium ion-exchange. ? 2021, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.