Abstract
To improve the safety performance of lithium-ion batteries, the research of composite separator with high temperature resistance is one of the strategies. Herein, a poly(vinylidene fluoride-hexafluoropropylene)/cellulose/carboxylic titanium dioxide (PVDF-HFP/cellulose/C-TiO2) composite separator is prepared by the phase inverse method. The composite separator has higher porosity (63.65%) and electrolyte uptake (210.3%) than PP separator, exhibiting good heat resistance that can keep its shape and size under 160 °C for 0.5 h. Additionally, it has a superior ionic conductivity of 1.24–1.49 mS cm−1 and a lower charge transfer impedance at a room temperature, which brings about better cycle and rate performance. Promisingly, the cell assembled with the PVDF-HFP/cellulose/C-TiO2 composite separator has a high electrochemical working window and a high current charge of ability, and can undergo 10 charge-discharge cycles normally under 120 °C. The PVDF-HFP/cellulose/C-TiO2 composite separator has promising potentials for high current and voltage charging, which can improve the safety performance of the lithium-ion battery.
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This work has been supported by the National Natural Science Foundation of China (nos. 11872054, 11702234, 11772164, and 51902274).
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Li, L., Li, H., Wang, Y. et al. Poly(vinylidenefluoride-hexafluoropropylene)/cellulose/carboxylic TiO2 composite separator with high temperature resistance for lithium-ion batteries. Ionics 26, 4489–4497 (2020). https://doi.org/10.1007/s11581-020-03587-5
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DOI: https://doi.org/10.1007/s11581-020-03587-5