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DOI	10.1039/c9ee04062e
	Origin of extra capacity in the solid electrolyte interphase near high-capacity iron carbide anodes for Li ion batteries
	Chen D.; Feng C.; Han Y.; Yu B.; Chen W.; Zhou Z.; Chen N.; Goodenough J.B.; He W.
发表日期	2020
ISSN	1754-5692
起始页码	2924
结束页码	2937
卷号	13 期号:9
英文摘要	Transition metal carbides (TMCs), known to deliver extra capacity beyond the theoretical limit, are proposed as emerging high-capacity anodes for next-generation lithium ion batteries (LIBs). Nevertheless, the underlying mechanism for the extra lithium storage in TMCs has not been revealed clearly due to the electrochemical inertness of TMCs to Li in cycling. Here, for the first time, by employing in situ Raman and X-ray photoelectron spectroscopies, we corroborate that the capacity enhancement of Fe3C anodes originates from the physiochemical evolution of solid electrolyte interphase (SEI) and surface carbonaceous materials through three mechanisms: (i) Fe3C catalyzes the reversible conversion between esters and ethers to store extra lithium ions in the SEI; (ii) Fe and inorganic components embedded in the SEI form a reversible surface-conversion reaction of Fe + 3LiF ⇌ FeF3 + 3Li+ + 3e- to contribute additional capacity; and (iii) surficial carbon delivers capacity through surface capacitive effects and Li+ inter/deintercalation processes. With the extra lithium ion storage in the SEI and carbon, the C@Fe3C/Fe anode delivers a high reversible capacity of 808 mA h g-1 after 700 cycles at 1 A g-1. This study provides a fundamental basis for emerging high-capacity TMC anodes to be efficiently explored for next-generation LIBs. This journal is © The Royal Society of Chemistry.
语种	英语
scopus关键词	Anodes; Carbides; Carbon; Fluorine compounds; Ions; Iron compounds; Iron metallography; Lithium compounds; Lithium metallography; Solid electrolytes; Solid-State Batteries; Surface reactions; Transition metals; Capacity enhancement; Carbonaceous materials; High reversible capacities; Inorganic components; Lithium ion storages; Solid electrolyte interphase; Surface conversions; Transition metal carbide; Lithium-ion batteries; electrolyte; equipment component; iron; performance assessment
来源期刊	Energy and Environmental Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/162402
作者单位	School of Physics, University of Electronic Science and Technology of China, Chengdu, 611731, China; Materials Science and Engineering Program, Texas Materials Institute, University of Texas at Austin, Austin, TX 78712, United States; National Key Laboratory of Science and Technology on Advanced Composites in Special Environments, And Center for Composite Materials and Structures, Harbin Institute of Technology, Harbin, 150080, China
推荐引用方式 GB/T 7714	Chen D.,Feng C.,Han Y.,et al. Origin of extra capacity in the solid electrolyte interphase near high-capacity iron carbide anodes for Li ion batteries[J],2020,13(9).
APA	Chen D..,Feng C..,Han Y..,Yu B..,Chen W..,...&He W..(2020).Origin of extra capacity in the solid electrolyte interphase near high-capacity iron carbide anodes for Li ion batteries.Energy and Environmental Science,13(9).
MLA	Chen D.,et al."Origin of extra capacity in the solid electrolyte interphase near high-capacity iron carbide anodes for Li ion batteries".Energy and Environmental Science 13.9(2020).