Constructing\na Robust Interphase with 1,1′-Oxalyldiimidazole\n(ODI) Additive to Enhance the Temperature and Rate Performance of\nLiNi<sub>0.8</sub>Co<sub>0.1</sub>Mn<sub>0.1</sub>O<sub>2</sub>/Graphite

This\nwork develops 1,1′-oxalyldiimidazole (ODI) as a functional\nelectrolyte additive. This film-forming additive improves the wide\nrange of temperature and rate performances of LiNi<sub>0.8</sub>Co<sub>0.1</sub>Mn<sub>0.1</sub>O<sub>2</sub>/graphite (NCM811) batteries.\nAfter 1200 cycles at room temperature (25 °C), the discharge\ncapacity retention rate is 51.95% for the battery with a blank electrolyte,\nand it is 93.18% for that with an ODI-containing electrolyte. With\n0.1% ODI, the discharge capacity retention increases from 0 to 75.89%\nafter 500 cycles at 45 °C and increases from 48.51 to 95.54%\nafter 300 cycles at −10 °C. In addition, the rate performance\nis also enhanced by the introduction of 0.1% ODI. With spectroscopic\ncharacterization, the improvement of battery electrochemical performance\nby ODI is supported. It is demonstrated that ODI tends to preferentially\ndecompose on the electrodes and then participates in the construction\nof a stable interfacial film with low impedance, resulting in the\nimprovement of battery performance. Not only does this work develop\nan imidazole-based electrolyte, but it also inspires innovative approaches\nto creating functional additives that can enhance battery performance.