气候变化领域集成服务门户(CCPortal): An efficient organic magnesium borate-based electrolyte with non-nucleophilic characteristics for magnesium-sulfur battery

CCPortal

DOI	10.1039/c7ee02304a
	An efficient organic magnesium borate-based electrolyte with non-nucleophilic characteristics for magnesium-sulfur battery
	Du A.; Zhang Z.; Qu H.; Cui Z.; Qiao L.; Wang L.; Chai J.; Lu T.; Dong S.; Dong T.; Xu H.; Zhou X.; Cui G.
发表日期	2017
ISSN	17545692
起始页码	2616
结束页码	2625
卷号	10 期号:12
英文摘要	Two-electron transfer chemistry based on earth-abundant Mg and S offers great possibilities of delivering higher energy density than current Li-ion technology. The development of non-nucleophilic electrolytes that reversibly and efficiently plate and strip Mg is believed to be a major obstacle to the implementation of this divalent battery technology. In this study, we present a new type of organic magnesium borate-based electrolyte that primarily comprises tetrakis(hexafluoroisopropyl)borate anions [B(HFP)4]- and solvated cations [Mg4Cl6(DME)6]2+, which was synthesized via a facile in situ reaction of tris(hexafluoroisopropyl)borate [B(HFP)3], MgCl2 and Mg powder in 1,2-dimethoxyethane (DME). Rigorous analyses including NMR, mass spectroscopy and single-crystal XRD were conducted to identify the equilibrium species in the abovementioned solution. The as-prepared Mg-ion electrolyte exhibited unprecedented Mg plating/stripping performance, such as high anodic stability up to 3.3 V (vs. Mg/Mg2+), high ionic conductivity of 5.58 mS cm-1, a low overpotential of 0.11 V for plating processes and Coulombic efficiencies greater than 98%. By virtue of the non-nucleophilic nature of this electrolyte, a fully reversible Mg/S battery was constructed that displayed an extremely low overpotential of 0.3 V and a high discharge capacity of up to 1247 mA h g-1 and yielded a specific energy of approximately 1200 W h kg-1 (10 times higher that of the Chevrel benchmark) based on the weight of active sulfur. More significantly, commonly used sulfur-carbon nanotube (S-CNTs) cathodes with S contents of 80 wt% and S loadings of 1.5 mg cm-2 were demonstrated to withstand more than 100 cycles without obvious capacity decay and to enable fast conversion processes, which achieved a charging current rate of up to 500 mA g-1. Our findings convincingly validate the pivotal role of the newly designed non-nucleophilic Mg-ion electrolyte for practical Mg/S battery chemistry. © The Royal Society of Chemistry.
英文关键词	Carbon; Carbon nanotubes; Chlorine compounds; Electric batteries; Electrolytes; Ions; Lithium-ion batteries; Magnesium compounds; Magnesium powder; Mass spectrometry; Secondary batteries; Single crystals; Sulfur; Yarn; Anodic stabilities; Battery chemistries; Conversion process; Coulombic efficiency; Discharge capacities; Higher energy density; Nucleophilic electrolytes; Two-electron transfer; Magnesium; borate; carbon nanotube; electrical conductivity; electrode; electrolyte; energy efficiency; ion exchange; magnesium; performance assessment; solvent; sulfur
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/190358
作者单位	Qingdao Industrial Energy Storage Research Institute, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, 266101, China; University of Chinese Academy of Sciences, Beijing, 100190, China; College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao, 266042, China
推荐引用方式 GB/T 7714	Du A.,Zhang Z.,Qu H.,et al. An efficient organic magnesium borate-based electrolyte with non-nucleophilic characteristics for magnesium-sulfur battery[J],2017,10(12).
APA	Du A..,Zhang Z..,Qu H..,Cui Z..,Qiao L..,...&Cui G..(2017).An efficient organic magnesium borate-based electrolyte with non-nucleophilic characteristics for magnesium-sulfur battery.Energy & Environmental Science,10(12).
MLA	Du A.,et al."An efficient organic magnesium borate-based electrolyte with non-nucleophilic characteristics for magnesium-sulfur battery".Energy & Environmental Science 10.12(2017).