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以丙酮为溶剂,聚偏氟乙烯(PVDF)为成膜物质,纳米SiO2为填料,采用流延法制备聚偏氟乙烯复合隔膜。TG-DSC测试结果表明,该隔膜在420℃急剧热失重,500℃时几乎反应完全。该隔膜在185℃时放热速率达到阈值0.05 K/min。SEM照片显示该隔膜平均孔径约为2μm,三维结构且孔隙率较高,有利于吸附电解液。由该隔膜制作的60 Ah锂离子电池内阻约为0.85Ω·cm2,制作的40 Ah单电芯55℃,3C放电,电池表面温升5.8℃;制作的14s-60 Ah的电池组循环500次,容量衰减16.2%。
Using acetone as solvent, polyvinylidene fluoride (PVDF) as film-forming substance and nano-SiO2 as filler, polyvinylidene fluoride composite membrane was prepared by casting method. TG-DSC test results show that the diaphragm at 420 ℃ rapid thermal weight loss, almost completely reacted at 500 ℃. The membrane reached a threshold of 0.05 K / min at 185 ° C. The SEM image shows that the average pore diameter of the separator is about 2μm, and the three-dimensional structure has high porosity, which is favorable for adsorbing the electrolyte. 60 Ah lithium ion battery produced by the diaphragm internal resistance of about 0.85Ω · cm2, produced 40 Ah single core 55 ℃, 3C discharge, the battery surface temperature rise 5.8 ℃; produced 14s-60 Ah battery cycle 500 Times, the capacity decay 16.2%.