Abstract
With the wide applications of lithium-ion batteries (LIBs) in electronic devices and electric vehicles, it is of great importance to improve their safety and electrochemical performance. Herein, soluble polyimides (PI) containing carboxyl groups (−COOH) were synthesized by a simple one-step method and PI separators with sponge-like, interpenetrating porous structures were prepared via non-solvent induced phase separation (NIPS). The obtained PI separators exhibited excellent thermal stability and fire-resistance properties, with the electrolyte uptake of 344% and good dimensional integrity in air at 200 °C. The results showed that the lithium-ion transference number of the obtained PI separator could reach 0.48, which was much higher than that of the Celgard-2400 separator (0.38). The Li/LiFePO4 half-cell with the PI separator showed excellent cycle capability and high-rate performance with a high capacity of 121.80 mA·h·g−1 at 5 C, which was better than that of the cell with the Celgard-2400 separator (54.3 mA·h·g−1), demonstrating the promising applications of this PI separators in LIBs.
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This work was financially supported by the National Natural Science Foundation of China (Nos. U21A2087, 51903038 and 21975040).
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Construction of Safety and Non-flammable Polyimide Separator Containing Carboxyl Groups for Advanced Fast Charing Lithium-ion Batteries
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Gu, JP., Zhang, KY., Li, XT. et al. Construction of Safety and Non-flammable Polyimide Separator Containing Carboxyl Groups for Advanced Fast Charing Lithium-ion Batteries. Chin J Polym Sci 40, 345–354 (2022). https://doi.org/10.1007/s10118-022-2678-4
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DOI: https://doi.org/10.1007/s10118-022-2678-4