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DOI	10.1039/c7ee00954b
	The role of iodide in the formation of lithium hydroxide in lithium-oxygen batteries
	Tułodziecki M.; Leverick G.M.; Amanchukwu C.V.; Katayama Y.; Kwabi D.G.; Bardé F.; Hammond P.T.; Shao-Horn Y.
发表日期	2017
ISSN	17545692
起始页码	1828
结束页码	1842
卷号	10 期号:8
英文摘要	Lithium iodide has been studied extensively as a redox-mediator to reduce the charging overpotential of Li-oxygen (Li-O2) batteries. Ambiguities exist regarding the influence of lithium iodide on the reaction product chemistry and performance of lithium-oxygen batteries. In this work, we examined the role of lithium iodide on the reduction product chemistry under two conditions: (i) mixing KO2 with lithium salts and (ii) discharging Li-oxygen batteries at high and low overpotentials, in the presence of an ether-based electrolyte with different ratios of H2O:LiI. The addition of iodide to electrolytes containing water was found to promote the formation of LiOOH·H2O, LiOH·H2O and LiOH at the expense of Li2O2. At low H2O:LiI ratios (lower than 5), LiOH instead of Li2O2 was formed, which was accompanied by the oxidation of iodide to triodide while at high H2O:LiI ratios (12, 24, 134), a mixture of Li2O2, LiOOH·H2O and LiOH·H2O was observed and no triiodide was detected. The reaction between peroxide Li2O2 and/or superoxide LiO2 with H2O to form LiOH is facilitated by increased water acidity by strong I--H2O interactions as revealed by 1H NMR and FT-IR measurements. This mechanism of LiOH formation in the presence of LiI and H2O was also found upon Li-O2 cell discharge, which is critical to consider when developing LiI as a redox mediator for Li-O2 batteries. © The Royal Society of Chemistry 2017.
英文关键词	Electric batteries; Electrolytes; Infrared imaging; Lithium; Oxygen; Secondary batteries; Cell discharge; IR measurements; Lithium hydroxide; Lithium iodide; Lithium-oxygen batteries; Over potential; Redox mediators; Reduction products; Lithium batteries
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/190440
作者单位	Research Laboratory of Electronics, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, United States; Department of Mechanical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Ave, Cambridge, MA 02139, United States; Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Ave, Cambridge, MA 02139, United States; Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto, 615-8510, Japan; Research and Development 3, Advanced Technology 1, Toyota Motor Europe, Hoge Wei 33 B, Zaventem, B-1930, Belgium; Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Ave, Cambridge, MA 02139, United States
推荐引用方式 GB/T 7714	Tułodziecki M.,Leverick G.M.,Amanchukwu C.V.,et al. The role of iodide in the formation of lithium hydroxide in lithium-oxygen batteries[J],2017,10(8).
APA	Tułodziecki M..,Leverick G.M..,Amanchukwu C.V..,Katayama Y..,Kwabi D.G..,...&Shao-Horn Y..(2017).The role of iodide in the formation of lithium hydroxide in lithium-oxygen batteries.Energy & Environmental Science,10(8).
MLA	Tułodziecki M.,et al."The role of iodide in the formation of lithium hydroxide in lithium-oxygen batteries".Energy & Environmental Science 10.8(2017).