以聚酰胺酸作为纺丝液,经过静电纺丝、热亚胺化和复合改性,制备出一种孔径小、孔径分布窄的聚酰亚胺纳米纤维复合隔膜。利用扫描电子显微镜、孔径分析仪分析了复合隔膜的微观形貌和孔径分布,研究了静电纺丝液浓度、膜厚度及复合改性对复合隔膜孔径分布的影响。结果表明,制备的聚酰亚胺纳米纤维复合隔膜平均孔径小于0.1μm,用其组装的锂电池首次放电容量超过2000mAh,电池内阻与市售Celgard 2325隔膜相比降低了8.7%。
With using polyamide acid as the precursor solution,a polyimide(PI) nanofiber composite separator with small pore size and narrow pore size distribution was prepared by electrospinning,thermal imization and composite modification.The microstructure and pore size distribution of the separator were analyzed by scanning electron microscope and pore size analyzer.The effects of the concentration of electrospinning solution,the thickness of electrospun membrane and the modification of electrospun membrane on the pore size distribution of the membrane were studied.The results showed that the average pore diameter of the separator was less than 0.1μm.The initial discharge capacity of the assembled lithium battery can reach more than 2000mAh,and the internal resistance of the battery was 8.7% lower than that of the commercially available separator Celgard 2325.
[1] Arora P,Zhang Z.Battery separators[J].Chemical Reviews,2004,104(10):4419-4462.
[2] Yoneda H,Nishimura Y,Doi Y,et al.Development of microporous PE films to improve lithium ion batteries[J].Polym J,2010,42(6):425-437.
[3] 王畅,吴大勇.锂离子电池隔膜及技术进展[J].储能科学与技术,2016,5(2):120-128.
[4] Ryou M H,Lee Y M,Park J K,et al.Mussel-inspired polydopamine-treated polyethylene separators for high-power Li-ion batteries[J].Advanced Materials,2011,23(27):3066-3070.
[5] 贺磊,陈宗明,迟婷玉,等.锂离子电池PET/TENCEL无纺布陶瓷隔膜研究[J].化工新型材料,2014,42(7):45-47.
[6] Jeong H S,Choi E S,Lee S Y.Composition ratio-dependent structural evolutin of SiO2/poly(vinylidene fluoride-hexafluoropropylene)-coated poly(ethylene terephthalate) nonwoven composite separators for lithium-ion batteries[J].Electrochimica Acta,2012,86:317-322.
[7] 高晓亮,李文秀,刘学武.相转化法制备聚苯醚基锂电隔膜及其性能研究[J].化工新型材料,2017,45(7):114-119.
[8] Shayapat J,Chung C K,Park J S.Electrospun polyimide-composite separator for lithium-ion batteries[J].Electrochimica Acta,2015,170:110-121.
[9] Wu D,Shi C,Huang S,et al.Electrospun nanofibers for sandwiched polyimide/poly(vinylidene fluride)/polyimide separators with the thermal shutdown function[J].Electrochimica Acta,2015,176:727-734.
[10] Yang C,Jia Z,Guan Z,et al.Polyvinylidene fluoride membrane by novel electrospinning system for separator of Li-ion batteries[J].Journal of Power Sources,2009,189(1):716-720.
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