Journal
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
Volume 151, Issue 8, Pages A1257-A1263Publisher
ELECTROCHEMICAL SOC INC
DOI: 10.1149/1.1767158
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Lithium dendrite formation is investigated via in situ microscopy in a liquid electrolyte containing polyethylene glycol dimethyl ether + lithium bis(trifluoromethylsulfonyl)imide and composite gel-like electrolytes formed by dispersing nanometer-size fumed silica into the liquid. Fumed silicas with either hydrophilic silanol surface groups or hydrophobic octyl surface groups were employed. Dendrites with current density-dependent morphology are formed in liquid electrolyte but addition of fumed silica inhibits their formation, with hydrophilic fumed silica having a more pronounced effect than hydrophobic silica. The dendrite inhibition effect of fumed silica is attributed to its abilities to form a continuous network with elastic-like properties and scavenge impurities from the electrolyte. (C) 2004 The Electrochemical Society.
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