期刊
JOURNAL OF POWER SOURCES
卷 293, 期 -, 页码 1062-1067出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2015.06.044
关键词
Lithium metal battery; Lithium dendrite suppression; Lithium protection; CsPF6 additive; Li vertical bar LiFePO4 cells
资金
- China Scholarship Council for overseas studies [201208420238]
- Fundamental Research Funds for the Central Universities [2014-Ia-031, 2013HGCH0002]
- National Science Foundation of China [21006033, 51372060]
The practical application of lithium (Li) metal anode in rechargeable Li batteries is hindered by both the growth of Li dendrites and the low Coulombic efficiency (CE) during repeated charge/discharge cycles. Recently, we have discovered that CsPF6 as an electrolyte additive can significantly suppress Li dendrite growth and lead to highly compacted and well aligned Li nanorod structures during Li deposition on copper substrates. In this paper, the effect of CsPF6 additive on the performance of rechargeable Li metal batteries with lithium iron phosphate (LFP) cathode is further studied. Li vertical bar LFP coin cells with CsPF6 additive in electrolytes show well protected Li anode surface, decreased resistance, enhanced rate capability and extended cycling stability. In Li vertical bar LFP cells, the electrolyte with CsPF6 additive shows excellent long-term cycling stability (at least 500 cycles) at a charge current density of 0.5 mA cm(-2) without internal short circuit. At high charge current densities, the effect of CsPF6 additive becomes less significant. Future work needs to be done to protect Li metal anode, especially at high charge current densities and for long cycle life. (C) 2015 Elsevier B.V. All rights reserved.
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