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：Zhou, Dengfeng;周登风

通信作者：Li, JQ[1];Guo, JB[1];Guo, JB[2]

机构：[1]Guizhou Univ, Coll Mat & Met, Guiyang 550025, Peoples R China;[2]Guizhou Inst Technol, Sch Mat & Met Engn, Guiyang 550003, Peoples R China;[3]Natl Engn Res Ctr Compounding & Modificat Polymer, Guiyang 550014, Peoples R China;[4]Guizhou Mat Ind Technol Inst, Mat Technol Innovat Base Guizhou Prov, Guiyang 550014, Peoples R China

第一机构：Guizhou Univ, Coll Mat & Met, Guiyang 550025, Peoples R China

通信机构：corresponding author), Guizhou Univ, Coll Mat & Met, Guiyang 550025, Peoples R China;corresponding author), Natl Engn Res Ctr Compounding & Modificat Polymer, Guiyang 550014, Peoples R 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：;WOS:【SCI-EXPANDED(收录号:WOS:000691959300005)】；

基金：This work is financially supported by National Natural Science Foundation of China (51774012), Program of Application and Industrialization of Scientific and Technological Achievements of Guizhou (2016-4538), High-level Innovative Talents Training Project of Guizhou (2016/5667,2019/5035), and Natural Science Research Project of Guizhou Department of Education ([2019] 068).

语种：英文

外文关键词：Charge transfer - Crystal impurities - Crystal structure - Electric discharges - Electrochemical properties - Energy dispersive spectroscopy - Ion exchange - Ions - Lithium compounds - Manganese compounds - Microspheres - Nickel compounds - Ruthenium - Ruthenium compounds - Scanning electron microscopy - Solid state reactions - X ray photoelectron 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 (R-ct), which is beneficial to lithium ion-exchange.