期刊
JOURNAL OF POWER SOURCES
卷 279, 期 -, 页码 413-418出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2015.01.030
关键词
Lithium-metal battery; Lithium bromide; Dendrite; Liquid electrolyte; Electrodeposition
资金
- Energy Materials Center at Cornell, an Energy Frontier Research Center - US Department of Energy, Office of Science, Office of Basic Energy Sciences [DESC0001086]
- King Abdullah University of Science and Technology (KAUST) [KUS-C1-018-02]
- DOE Vehicle Technologies Program (VTP)
- NSF MRSEC programDMR-1120296
Development of high-energy lithium-based batteries that are safe remains a challenge due to the nonuniform lithium electrodeposition during repeated charge and discharge cycles. We report on the effectiveness of lithium bromide (LiBr) salt additives in a common liquid electrolyte (i.e. propylene carbonate (PC)) on the stability of lithium electrodeposition. From galvanostatic cycling measurements, we find that the presence of LiBr in PC provides more than 20-fold enhancement in cell lifetime over the control LiTFSI/PC electrolyte. Batteries containing 30 mol% LiBr additive in the electrolytes are able to cycle stably for at least 1.8 months with no observations of cell failure. From galvanostatic polarization measurements, an electrolyte containing 30 mol% LiBr shows a maximum improvement in lifetime. The formation of uneven lithium electrodeposits is significantly suppressed by the Br-containing SEI layers, evidenced by impedance spectra, post-mortem SEM and XPS analyses. The study also concludes that good solubility of halogenated salts is not necessary for achieving the observed improvements in cell lifetime. (C) 2015 Elsevier B.V. All rights reserved.
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