气候变化领域集成服务门户(CCPortal): Revealing electrolyte oxidation: Via carbonate dehydrogenation on Ni-based oxides in Li-ion batteries by in situ Fourier transform infrared spectroscopy

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DOI	10.1039/c9ee02543j
	Revealing electrolyte oxidation: Via carbonate dehydrogenation on Ni-based oxides in Li-ion batteries by in situ Fourier transform infrared spectroscopy
	Zhang Y.; Katayama Y.; Tatara R.; Giordano L.; Yu Y.; Fraggedakis D.; Sun J.G.; Maglia F.; Jung R.; Bazant M.Z.; Shao-Horn Y.
发表日期	2020
ISSN	17545692
起始页码	183
结束页码	199
卷号	13 期号:1
英文摘要	Understanding (electro-)chemical reactions at the electrode-electrolyte interface (EEI) is crucial to promote the cycle life of lithium-ion batteries. In this study, we developed an in situ Fourier-transform infrared spectroscopy (FT-IR) method, which provided unprecedented information on the oxidation of carbonate solvents via dehydrogenation on LiNixMnyCo1-x-yO2 (NMC). While ethylene carbonate (EC) was stable against oxidation on Pt up to 4.8 VLi, unique evidence for dehydrogenation of EC on LiNi0.8Co0.1Mn0.1O2 (NMC811) at voltages as low as 3.8 VLi was revealed by in situ FT-IR measurements, which was supported by density functional theory (DFT) results. Unique dehydrogenated species from EC were observed on NMC811 surface, including dehydrogenated EC anchored on oxides, vinylene carbonate (VC) and dehydrogenated oligomers which could diffuse away from the surface. Similar dehydrogenation on NMC811 was noted for EMC-based and LP57 (1 M LiPF6 in 3:7 EC/EMC) electrolytes. In contrast, no dehydrogenation was found for NMC111 or surface-modified NMC by coatings such as Al2O3. In addition, while the dehydrogenation of solvents was observed in 1 M electrolytes with different anions, they were not observed on NMC811 in the concentrated electrolyte (EC/EMC with 3.1 M LiPF6), indicating lithium coordination could suppress dehydrogenation. Dehydrogenation of carbonates on NMC811 accompanied with rapid growth of interfacial impedance with increasing voltage revealed by electrochemical impedance spectroscopy (EIS), while the electrode-electrolyte combinations without dehydrogenation did not show significant impedance growth. Therefore, minimizing carbonate dehydrogenation on the NMC surface by tuning electrode reactivity and electrolyte reactivity is critical to develop high-energy Li-ion batteries with long cycle life. © 2020 The Royal Society of Chemistry.
英文关键词	Alumina; Aluminum oxide; Carbonation; Charging (batteries); Dehydrogenation; Density functional theory; Electrochemical electrodes; Electrochemical impedance spectroscopy; Electrolytes; Ethylene; Fourier transform infrared spectroscopy; Infrared imaging; Ions; Nickel oxide; Oxidation; Carbonate solvents; Dehydrogenated species; Electrode-electrolyte interfaces; Electrolyte oxidation; Ethylene carbonate; Fourier transform infra red (FTIR) spectroscopy; Interfacial impedance; Vinylene carbonates; Lithium-ion batteries; electrode; electrokinesis; electrolyte; energy storage; ethylene; infrared spectroscopy; lithium; nickel; oxidation
语种	英语
来源期刊	Energy & Environmental Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/189740
作者单位	Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, United States; Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, MA 02139, United States; Department of Applied Chemistry, Graduate School of Sciences and Technology for Innovation, Yamaguchi University, Ube, 755-8611, Japan; Department of Material Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, United States; Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, United States; BMW Group Petuelring 130, München, 80788, Germany; Department of Mathematics, Massachusetts Institute of Technology, Cambridge, MA 02139, United States
推荐引用方式 GB/T 7714	Zhang Y.,Katayama Y.,Tatara R.,et al. Revealing electrolyte oxidation: Via carbonate dehydrogenation on Ni-based oxides in Li-ion batteries by in situ Fourier transform infrared spectroscopy[J],2020,13(1).
APA	Zhang Y..,Katayama Y..,Tatara R..,Giordano L..,Yu Y..,...&Shao-Horn Y..(2020).Revealing electrolyte oxidation: Via carbonate dehydrogenation on Ni-based oxides in Li-ion batteries by in situ Fourier transform infrared spectroscopy.Energy & Environmental Science,13(1).
MLA	Zhang Y.,et al."Revealing electrolyte oxidation: Via carbonate dehydrogenation on Ni-based oxides in Li-ion batteries by in situ Fourier transform infrared spectroscopy".Energy & Environmental Science 13.1(2020).