气候变化领域集成服务门户(CCPortal): Liquefied gas electrolytes for wide-temperature lithium metal batteries

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DOI	10.1039/d0ee01446j
	Liquefied gas electrolytes for wide-temperature lithium metal batteries
	Yang Y.; Yin Y.; Davies D.M.; Zhang M.; Mayer M.; Zhang Y.; Sablina E.S.; Wang S.; Lee J.Z.; Borodin O.; Rustomji C.S.; Meng Y.S.
发表日期	2020
ISSN	1754-5692
起始页码	2209
结束页码	2219
卷号	13 期号:7
英文摘要	The momentum in developing next-generation high energy batteries calls for an electrolyte that is compatible with both lithium (Li) metal anodes and high-voltage cathodes, and is also capable of providing high power in a wide temperature range. Here, we present a fluoromethane-based liquefied gas electrolyte with acetonitrile cosolvent and a higher, yet practical, salt concentration. The unique solvation structure observed in molecular dynamics simulations and confirmed experimentally shows not only an improved ionic conductivity of 9.0 mS cm-1 at +20 °C but a high Li transference number (tLi+ = 0.72). Excellent conductivity (>4 mS cm-1) was observed from-78 to +75 °C, demonstrating operation above fluoromethane's critical point for the first time. The liquefied gas electrolyte also enables excellent Li metal stability with a high average coulombic efficiency of 99.4% over 200 cycles at the aggressive condition of 3 mA cm-2 and 3 mA h cm-2. Also, dense Li deposition with an ideal Li-substrate contact is seen in the liquefied gas electrolyte, even at-60 °C. Attributed to superior electrolyte properties and the stable interfaces on both cathode and anode, the performances of both Li metal anode and Li/NMC full cell (up to 4.5 V) are well maintained in a wide-temperature range from-60 to +55 °C. This study provides a pathway for wide-temperature electrolyte design to enable high energy density Li-metal battery operation between-60 to +55 °C. © 2020 The Royal Society of Chemistry.
语种	英语
scopus关键词	Anodes; Cathodes; Liquefied gases; Lithium; Lithium batteries; Molecular dynamics; Coulombic efficiency; Electrolyte properties; High energy densities; High voltage cathode; Molecular dynamics simulations; Solvation structure; Transference number; Wide temperature ranges; Electrolytes; electrolyte; equipment component; fuel cell; lithium; performance assessment; temperature
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/162883
作者单位	Materials Science and Engineering, University of California San Diego, San Diego, CA 92121, United States; Department of Nano Engineering, University of California San Diego, San Diego, CA 92121, United States; South 8 Technologies Inc., San Diego, CA 92109, United States; Electrochemistry Branch, Sensors and Electron Devices Directorate, U.S. Army Research Laboratory, Adelphi, MD 20783, United States; Joint Center for Energy Storage Research, U.S. Army Research Laboratory, Adelphi, MD 20783, United States
推荐引用方式 GB/T 7714	Yang Y.,Yin Y.,Davies D.M.,et al. Liquefied gas electrolytes for wide-temperature lithium metal batteries[J],2020,13(7).
APA	Yang Y..,Yin Y..,Davies D.M..,Zhang M..,Mayer M..,...&Meng Y.S..(2020).Liquefied gas electrolytes for wide-temperature lithium metal batteries.Energy and Environmental Science,13(7).
MLA	Yang Y.,et al."Liquefied gas electrolytes for wide-temperature lithium metal batteries".Energy and Environmental Science 13.7(2020).