Abstract
The advancement of high-energy density lithium-ion batteries has an important impact on developing and popularizing electric vehicles, drones, and other electric tools. However, inferior interfacial stability between electrodes and electrolytes at high voltage has constrained the development of lithium-ion batteries. Here, benzyl isocyanate (BI) with an isocyanate group has been investigated as an electrolyte additive to enhance electrode/electrolyte intercalation stability in lithium-ion batteries. The results demonstrate that BI can be preferentially oxidized on the electrode surface to form a stable and uniform protective film, which reduces the interfacial impedance and thus improves the cycling stability of the cell. In the electrolyte containing 3 wt% BI, the capacity retention of Li||LiNi0.8Co0.1Mn0.1O2 was maintained at 79.4% after 200 cycles, which was greater than that of the baseline electrolyte (66.9%).
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This work was financially supported by the National Natural Science Foundation of China (22075173) and the Science and Technology Commission of Shanghai Municipality (19DZ2271100 and 21010501100).
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Wang, R., Shen, J., Xie, Q. et al. Benzyl isocyanate: an effective high-voltage film-forming additive for lithium-ion batteries. Ionics 29, 2687–2695 (2023). https://doi.org/10.1007/s11581-023-05016-9
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DOI: https://doi.org/10.1007/s11581-023-05016-9