To date, enhancing the specific energy of LiCoO 2 /graphite batteries by increasing the cut-off charging voltage through the strategy of adding multifunctional additives in the electrolyte it is still an effective method and research hotspot. In this paper, 4-hydroxy-2-butanesulfonic acid gamma-sultone (HBAG) is demonstrated as an effective bifunctional electrolyte additive to improve the electrochemical performances of 4.4 V LiCoO 2 /graphite batteries. With the addition of 1.0% HBAG in the electrolyte, a capacity retention of 94.88% after 160 cycles can be obtained when the batteries are cycled in the voltage range of 3.0−4.4 V at 25 °C, which is much higher than the batteries with the base electrolyte (54.77%). It is indicated that the HBAG additive in the electrolyte is preferentially decomposed on two electrodes, which facilitates the formation of thin and uniform films on the cathode and anode. In particular, the interface films possess excellent Li + intercalation/deintercalation properties and can prevent further decomposition of the electrolyte, resulting in battery performance improvement. These results indicate that the HBAG-containing electrolyte has promising prospects for application in high-voltage LiCoO 2 /graphite batteries with good performance.
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