Synthesis and electrochemical characterization of Mg-Al co-doped Li-rich Mn-based cathode materials

doi:10.1039/c9nj01539f

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	Synthesis and electrochemical characterization of Mg-Al co-doped Li-rich Mn-based cathode materials
	Liang, Youwei; Li, Shiyou; Xie, Jing; Yang, Li; Li, Wenbo; Li, Chunlei; Ai, Ling; Fu, Xiaolan; Cui, Xiaoling; Shangguan, Xuehui
	2019-08-14
发表期刊	NEW JOURNAL OF CHEMISTRY
ISSN	1144-0546
卷号	43 期号:30 页码:12004-12012
摘要	Li-rich layered oxide cathodes suffer from poor rate capability, decayed voltage and inferior cycling stability. In this work, we propose a novel synergistic strategy to improve the electrochemical performance of Li-rich Li1.2Mn0.54Ni0.13Co0.13O2 by the co-doping of magnesium and aluminium. X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM), energy dispersive spectrometry (EDS) mapping, X-ray photoelectron spectroscopy (XPS) measurements and electrochemical tests have been performed for analyzing and observing the characteristics and electrochemical properties of the as-prepared materials. The co-doping of Mg and Al materials delivers a larger initial reversible capacity of 271.9 mA h g(-1), an improved cycling stability with 81.61% capacity retention after 100 cycles and an excellent rate capability of 119.8 mA h g(-1) at 5C. These significant improvements in electrochemical performances are possibly ascribed to the fact that tiny amounts of Mg and Al ions doped into the transition-metal layer help to enlarge the lithium slab spacing, leading to a reduced barrier of Li+ during the intercalation-deintercalation process and enhanced rate capability. Meanwhile, the co-doping of Mg and Al not only inhibits the formation of oxygen vacancies, but also decreases cation mixing, which hinders the undesirable phase transformation from layered to spinel-like phases during cycling.
DOI	10.1039/c9nj01539f
引用统计
文献类型	期刊论文
条目标识符	http://ir.isl.ac.cn/handle/363002/34105
专题	盐湖资源与化学实验室中国科学院青海盐湖研究所
推荐引用方式 GB/T 7714	Liang, Youwei,Li, Shiyou,Xie, Jing,et al. Synthesis and electrochemical characterization of Mg-Al co-doped Li-rich Mn-based cathode materials[J]. NEW JOURNAL OF CHEMISTRY,2019,43(30):12004-12012.
APA	Liang, Youwei.,Li, Shiyou.,Xie, Jing.,Yang, Li.,Li, Wenbo.,...&Shangguan, Xuehui.(2019).Synthesis and electrochemical characterization of Mg-Al co-doped Li-rich Mn-based cathode materials.NEW JOURNAL OF CHEMISTRY,43(30),12004-12012.
MLA	Liang, Youwei,et al."Synthesis and electrochemical characterization of Mg-Al co-doped Li-rich Mn-based cathode materials".NEW JOURNAL OF CHEMISTRY 43.30(2019):12004-12012.

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