Tuning Electrochemical Performance through Non-stoichiometric Compositions in High-voltage Spinel Cathode Materials

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	Tuning Electrochemical Performance through Non-stoichiometric Compositions in High-voltage Spinel Cathode Materials
	He Jie; Lee Sai-Xi; Wang Xue-Yin; Gu Qing-Wen; Xia Yong-Gao; Liu Zhao-Ping
刊名	JOURNAL OF INORGANIC MATERIALS
	2018
卷号	33 期号:9 页码:993-1000
关键词	Lithium-ion Batteries Polymer-assisted Synthesis Rate Capability Site Disorder Lini0.5mn1.5o4 Limn1.5ni0.5o4 Temperature Perspective Transport Electrode
英文摘要	this study, a simple method to prepare high-voltage spinel cathode materials though controlling stoichiometric ratio in their compositions was reported. Non-stoichiometric and stoichiometric high-voltage spinel LiNi0.5Mn1.5O4 cathode materials were prepared by solid-state reaction between Li2CO3 and Ni0.25Mn0.75(OH)(2) prcursor. Their morphologies, structures and electrochemical performance were characterized by scanning electron microscopy, X-ray diffraction, neutron diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy, as well as electrochemical curves. The second particles occupied the similar sizes similar to 8 mu m, which were composed of nano-particles. Compared to stoichiometric LiNi0.5Mn1.5O4, Ni/Mn cations in non-stoichiometric LiNi0.5Mn1.5O4 sample distributed randomly, resulting in structure disorder demonstrated by the analysis of X-ray diffraction, neutron diffration and Raman spectroscopy. Less Mn3+ content in stoichiometric LiNi0.5Mn1.5O4 sample was detected though X-ray photoelectron spectroscopy. It is believed that more Mn3+ content and Ni/Mn cation disorder would benefit rate cpability and cycling performance. As a result, non-stoichiometric LiNi0.5Mn1.5O4 sample delivers superior dicharge capacity at higher rates, even though it shows relatively minor discharge capacity at low rates. What's more, higher capacity retention for the non-stoichiometric LiNi0.5Mn1.5O4 sample was found, which was promoted to 91.2% at 1.0C rate after 400 cycles. At the same time, in situ X-ray diffraction measurements revealed that single-step phase transformation for non-stoichiometric LiNi0.5Mn1.5O4 sample significantly enhanced structural stability during the electrochemical process. Spinel LiNi0.5Mn1.5O4 with non-stoichiometric composition provides a promising solution for their potential application in high-energy-density lithium-ion batteries.
学科主题	Chemistry
语种	英语
公开日期	2018-12-04
内容类型	期刊论文
源URL	[http://ir.nimte.ac.cn/handle/174433/17190]
专题	2018专题
推荐引用方式 GB/T 7714	He Jie,Lee Sai-Xi,Wang Xue-Yin,et al. Tuning Electrochemical Performance through Non-stoichiometric Compositions in High-voltage Spinel Cathode Materials[J]. JOURNAL OF INORGANIC MATERIALS,2018,33(9):993-1000.
APA	He Jie,Lee Sai-Xi,Wang Xue-Yin,Gu Qing-Wen,Xia Yong-Gao,&Liu Zhao-Ping.(2018).Tuning Electrochemical Performance through Non-stoichiometric Compositions in High-voltage Spinel Cathode Materials.JOURNAL OF INORGANIC MATERIALS,33(9),993-1000.
MLA	He Jie,et al."Tuning Electrochemical Performance through Non-stoichiometric Compositions in High-voltage Spinel Cathode Materials".JOURNAL OF INORGANIC MATERIALS 33.9(2018):993-1000.