Journal
JOURNAL OF POWER SOURCES
Volume 156, Issue 2, Pages 629-633Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2005.04.023
Keywords
LiBF4; lithium bis(oxalate)borate; electrolyte additive; solid electrolyte interface; low temperature performance
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LiBF4-PC based electrolytes have superior potentials in enhancing cycling performance of Li-ion cells at low temperature and at high current rate, respectively. However, their application is prevented because of the poor capability in enabling graphite to form a solid electrolyte interface (SEI). In this work, we found that addition of small amount of lithium bis(oxalate)borate (LiBOB) into the LiBF4-based electrolytes could significantly promote SEI formation on the surface of graphite even in solutions with a high content of PC. This is attributed to the fact that LiBOB participates in the formation chemistry of the SEI. Results showed that 1-5 mol% LiBOB is sufficient to promote graphite cycling reversibly in 1.0 m LiBF4 1:13 PC/EC/EMC and 1.0 m LiBF4 1:1 PC/EC, respectively, while the excellent cycling performance of LiBF4-PC based electrolytes at low temperatures was maintained. Published by Elsevier B.V.
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