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Their work entitled “Free carbonate-based molecules in the electrolyte leading to severe safety concern of Ni-rich Li-ion batteries” has been highlighted as the back cover of Chem. Commun.
The safety of Li-ion batteries is one of the most important factors, if not the most, determining their practical applications. We have found that free carbonate-based solvent molecules in the hybrid electrolyte system can cause severe safety concerns. Mixing ionic liquids with a carbonate-based solvent as the co-solvent at a fixed salt concentration of 1 M LiPF6 can lead to free carbonate-based molecules causing poor charge storage performance and safety concerns.