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

IR > 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, Xiaoling1,2 ; Geng, Tongtong 1,2; Zhang, Feilong 1; Zhang, Ningshuang1,2 ; Zhao, Dongni1,2 ; Li, Chunlei1,2 ; Li, Shiyou1,2
	2020-04-15
发表期刊	JOURNAL OF ALLOYS AND COMPOUNDS
ISSN	0925-8388
卷号	820
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.
关键词	LiNi0.5Mn1.5O4 Voltage plateau Coulombic efficiency Capacity degradation Cut-off potential
DOI	10.1016/j.jallcom.2019.153443
收录类别	SCI ; SCIE
语种	英语
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
WOS类目	Chemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000507854700158
出版者	ELSEVIER SCIENCE SA
EI入藏号	20195207901478
EI主题词	Lithium compounds
EI分类号	461.2 Biological Materials and Tissue Engineering - 543.2 Manganese and Alloys - 548.1 Nickel - 702 Electric Batteries and Fuel Cells - 802.2 Chemical Reactions - 803 Chemical Agents and Basic Industrial Chemicals - 804 Chemical Products Generally - 913.1 Production Engineering
来源库	WOS
引用统计	被引频次：24[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	https://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
第一作者单位	石油化工学院
通讯作者单位	石油化工学院
第一作者的第一单位	石油化工学院
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).