摘要
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%。
PVDF composite separator was prepared through solution blending method,using acetone as solvent, PVDF as film forming material and nano-silica as the filling.The study showed the separator reacted at 420 ℃and decomposed completely at 500 ℃.The ARC curve illustrated the heat release rate of the separator reached threshold of 0.05 K/min at 185 ℃.The SEM results showed the pore diameter was 2μm.The separator was beneficial to adsorb electrolyte because of many microporous.The resistance of the polymer lithium battery made by the separator was 0.85 Ω？cm2 .The surface temperature rising of the 40 Ah battery was 5.8 ℃,dis-charged at 3 C rate at 55 ℃.The capacity of 14s-60 Ah batteries faded 16.2% after 500 cycles.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2014年第13期13098-13101,13107,共5页
Journal of Functional Materials
基金
国家国际科技合作专项资助项目(2011DFR50880)
关键词
复合隔膜
相分离技术
热蠕变
热稳定性
安全性
composite separator
phase separation technology
thermal creep
thermal stability
safety
