The influence of the voltage plateau on the coulombic efficiency and capacity degradation in LiNi0.5Mn1.5O4 materials
Cui, Xiaoling1,2; Geng, Tongtong1,2; Zhang, Feilong1; Zhang, Ningshuang1,2; Zhao, Dongni1,2; Li, Chunlei1,2; Li, Shiyou1,2
2020-04-15
Source PublicationJOURNAL OF ALLOYS AND COMPOUNDS
ISSN0925-8388
Volume820
AbstractHigh-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.
KeywordLiNi0.5Mn1.5O4 Voltage plateau Coulombic efficiency Capacity degradation Cut-off potential
DOI10.1016/j.jallcom.2019.153443
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[21566021][51962019] ; Gansu Province Science and Technology Major Project[17ZD2GC011]
WOS Research AreaChemistry ; Materials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectChemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS IDWOS:000507854700158
PublisherELSEVIER SCIENCE SA
Citation statistics
Cited Times:7[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.lut.edu.cn/handle/2XXMBERH/64136
Collection石油化工学院
Corresponding AuthorLi, Shiyou
Affiliation1.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
First Author AffilicationColl Petrochem Engn
Corresponding Author AffilicationColl Petrochem Engn
First Signature AffilicationColl Petrochem Engn
Recommended Citation
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).
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