The influence of the voltage plateau on the coulombic efficiency and capacity degradation in LiNi0.5Mn1.5O4 materials

doi:10.1016/j.jallcom.2019.153443

CORC > 兰州理工大学 > 兰州理工大学 > 石油化工学院

	The influence of the voltage plateau on the coulombic efficiency and capacity degradation in LiNi0.5Mn1.5O4 materials
	Cui, Xiaoling 1,2; Geng, Tongtong 1,2; Zhang, Feilong 1; Zhang, Ningshuang 1,2; Zhao, Dongni 1,2; Li, Chunlei 1,2; Li, Shiyou 1,2
刊名	JOURNAL OF ALLOYS AND COMPOUNDS
	2020-04-15
卷号	820
关键词	LiNi0.5Mn1.5O4 Voltage plateau Coulombic efficiency Capacity degradation Cut-off potential
ISSN号	0925-8388
DOI	10.1016/j.jallcom.2019.153443
英文摘要	High-voltage LiNi0.5Mn1.5O4 materials with working voltage of 4.7 V vs. Li/Li+ can be used in lithium-ion batteries to meet the demands of high-voltage applications. However, these materials tend to undergo capacity degradation with cycling, and exhibit low coulombic efficiency. The redox reactions of the transition metals in LiNi0.5Mn1.5O4 are related to voltage plateaus, which have an important influence on the electrochemical performance of lithium-ion batteries. In this work, we investigated the effects of two voltage plateaus for LiNi0.5Mn1.5O4 cathode (4.0 V vs. Li+/Li and 4.7 V vs. Li+/Li) on the capacity degradation and coulombic efficiency, through the charging of half-cells to different cut-off potentials. We find that the redox reactions of manganese at the 4.0 V plateau play a negligible role in the capacity loss, while the increase in manganese content in the cathode material can significantly affect the coulombic efficiency. By contrast, when the cell was charged to cut-off potentials >= 4.8 V with a plateau at 4.7 V for nickel, the cell capacity degraded rapidly. Interestingly, when the cells were charged to 5.0 V, the content of P, F, Ni, and Mn increased with the thickness of the SEI film, indicating accelerated decomposition of the electrolyte due to the contribution of nickel. Thus, this work verifies the dependence of the capacity degradation and coulombic efficiency on the voltage plateau, and provides important information for further investigation of the effect of voltage plateaus on the characteristics and behavior of cathode materials. (C) 2019 Elsevier B.V. All rights reserved.
资助项目	National Natural Science Foundation of China[21566021][51962019] ; Gansu Province Science and Technology Major Project[17ZD2GC011]
WOS研究方向	Chemistry ; Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
出版者	ELSEVIER SCIENCE SA
WOS记录号	WOS:000507854700158
状态	已发表
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/64136]
专题	石油化工学院
通讯作者	Li, Shiyou
作者单位	1.Lanzhou Univ Technol, Coll Petrochem Technol, Lanzhou 730050, Peoples R China 2.Gansu Engn Lab Cathode Mat Lithium Ion Battery, Lanzhou 730050, Peoples R China
推荐引用方式 GB/T 7714	Cui, Xiaoling,Geng, Tongtong,Zhang, Feilong,et al. The influence of the voltage plateau on the coulombic efficiency and capacity degradation in LiNi0.5Mn1.5O4 materials[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2020,820.
APA	Cui, Xiaoling.,Geng, Tongtong.,Zhang, Feilong.,Zhang, Ningshuang.,Zhao, Dongni.,...&Li, Shiyou.(2020).The influence of the voltage plateau on the coulombic efficiency and capacity degradation in LiNi0.5Mn1.5O4 materials.JOURNAL OF ALLOYS AND COMPOUNDS,820.
MLA	Cui, Xiaoling,et al."The influence of the voltage plateau on the coulombic efficiency and capacity degradation in LiNi0.5Mn1.5O4 materials".JOURNAL OF ALLOYS AND COMPOUNDS 820(2020).