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• W2049275327 abstract "Density functional theory (DFT) calculations and classical molecular dynamics (MD) simulations have been performed to gain insight into the difference in cycling behaviors between the ethylene carbonate (EC)-based and the propylene carbonate (PC)-based electrolytes in lithium-ion battery cells. DFT calculations of the lithium solvation, Li+(S)i (S = EC or PC; i = 1–4) with and without the presence of the counter anion showed that the desolvation energy to remove one solvent molecule from the first solvation shell of the lithium ion was significantly reduced by as much as 70 kcal mol−1 (293.08 kJ mol−1) in the presence of the counter anion, suggesting the lithium ion is more likely to be desolvated at high salt concentrations. The thermodynamic stability of the ternary graphite intercalation compounds, Li+(S)iC72, in which Li+(S)i was inserted into a graphite cell, was also examined by DFT calculations. The results suggested that Li+(EC)iC72 was more stable than Li+(PC)iC72 for a given i. Furthermore, some of Li+(PC)iC72 were found to be energetically unfavorable, while all of Li+(EC)i=1–4C72 were stable, relative to their corresponding Li+(S)i in the bulk electrolyte. In addition, the interlayer distances of Li+(PC)iC72 were more than 0.1 nm longer than those of Li+(EC)iC72. MD simulations were also carried out to examine the solvation structures at a high salt concentration of LiPF6: 2.45 mol kg−1. The results showed that the solvation structure was significantly interrupted by the counter anions, having a smaller solvation number than that at a lower salt concentration (0.83 mol kg−1). We propose that at high salt concentrations, the lithium desolvation may be facilitated due to the increased contact ion pairs so as to form a stable ternary GIC with less solvent molecules without destruction of graphite particles, followed by solid–electrolyte-interface film formation reactions. The results from both DFT calculations and MD simulations are consistent with the recent experimental observations." @default.
• W2049275327 created "2016-06-24" @default.
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• W2049275327 date "2011-12-01" @default.
• W2049275327 modified "2023-10-10" @default.
• W2049275327 title "On the difference in cycling behaviors of lithium-ion battery cell between the ethylene carbonate- and propylene carbonate-based electrolytes" @default.
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• W2049275327 doi "https://doi.org/10.1016/j.electacta.2011.05.112" @default.
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