UHMWPE微孔膜的制备工艺对膜性能的影响
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摘要
基于热致相分离(TIPS)原理,研究了锂离子电池隔膜用超高分子量聚乙烯(UHMWPE)微孔膜的制备工艺及其对微孔膜结构的影响,探索了不同平均分子量对加工成型性的影响,当铸片辊温度分别为20、30、50℃时,铸片辊温度对UHMWPE厚片后续拉伸工艺性的影响,在纵向拉伸倍率为6,横向拉伸倍率分别为4、5、6的条件下,拉伸倍率对微孔膜微观形态的影响,以及热定型时间对UHMWPE微孔膜结构的影响,同时,对UHMWPE微孔膜热致相分离(TIPS)成型机理进行了分析,优化了微孔膜的制备工艺,获得了UHMWPE微孔膜制备过程中微孔膜的结晶形态及结构的变化规律,为制备满足锂离子电池使用要求的UHMWPE微孔膜奠定了基础。
Based on the principle of thermal induced phase separation(TIPS),the preparation that lithium ion battery diaphragm with ultra-high molecular weight polyethylene(UHMWPE) microporous membrane, and the influences on microporous membrane structure were analyzed. The effect of different average molecular weight on processing formability was investigated. When the temperature of the casting roll was 20,30,50 ℃,respectively,the effect of casting roll temperature on subsequent stretching process of UHMWPE thick sheet was discussed. When the longitudinal tensile ratio was 6,the transverse tensile ratio was 4,5 and 6,respectively,the stretching ratio affected micro morphology of microporous membrane,and the heat setting time had effect on the structure of UHMWPE microporous membrane. The formation mechanism of thermally induced phase separation(TIPS) of UHMWPE microporous membrane was also analyzed,microporous membrane molding process was optimized,during the preparation of UHMWPE microporous membrane,crystallization morphology and structure's change rule of the microporous membrane were obtained. The foundation for the preparation of UHMWPE microporous membrane to meet the requirement of lithium ion battery was laid.
Based on the principle of thermal induced phase separation(TIPS),the preparation that lithium ion battery diaphragm with ultra-high molecular weight polyethylene(UHMWPE) microporous membrane, and the influences on microporous membrane structure were analyzed. The effect of different average molecular weight on processing formability was investigated. When the temperature of the casting roll was 20,30,50 ℃,respectively,the effect of casting roll temperature on subsequent stretching process of UHMWPE thick sheet was discussed. When the longitudinal tensile ratio was 6,the transverse tensile ratio was 4,5 and 6,respectively,the stretching ratio affected micro morphology of microporous membrane,and the heat setting time had effect on the structure of UHMWPE microporous membrane. The formation mechanism of thermally induced phase separation(TIPS) of UHMWPE microporous membrane was also analyzed,microporous membrane molding process was optimized,during the preparation of UHMWPE microporous membrane,crystallization morphology and structure's change rule of the microporous membrane were obtained. The foundation for the preparation of UHMWPE microporous membrane to meet the requirement of lithium ion battery was laid.
引文
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[13] WANG Q,SONG W,WANG L,et al. Electrospun polyimide-based fiber membrane as polymer electrolytes for lithium-ion batteries[J].Electrochimica Acta,2014,132:538-544.
[14] WANG J,HU Z,YIN X,et al. Alumina/phenolphthalein polyetherketone ceramic composite polypropylene separator film for lithium lon power batteries[J]. Electrochimica Acta,2015,159:61-65.
[15] XIAO S,WANG F,YANG Y,et al. An environmentally friendly and economic membrane based on cellulose as a gel polymer electrolyte for lithium ion batteries[J]. Royal Society Of Chemistry:2014,4(1):76-81.
[16] ZHANG Y,ROHAN R,SUN Y,et al. A gel single ion polymer electrolyte membrane for lithium-ion batteries with wide-temperature range operability[J]. Royal Society Of Chemistry,2014,4(40):21163-21170.
[2] XIAO S Y,YANG Y Q,LI M X,et al. A composite membrane based on biocompatible cellulose as a host of gel polymer electrolyte for lithium ion batteries[J]. Journal of Power Power Sources,2014,270:53-58.
[3]吴大勇,刘昌炎.锂离子电池隔膜研究进展[J].新材料产业,2006(9):48-53.
[4]胡树文,张正诚,方世璧.锂离子电池用聚合物固体电解质的新进展[J].高分子通报. 2001(1):9-15.
[5] SHUBHA N,PRASANTH R,HOON H H,et al. Plastic crystallinesemi crystalline polymer composite electrolyte based on non-woven poly(vinylidenefluoride-co-hexafluoropropylene)porous members for lithium ion batteries[J]. Electrochimica Acta,2014,125:362-370.
[6] CAI Z,LIU Y,LIU S,et al. High performance of lithium-ion polymer battery based on non-aqueous lithiated perfluorinated sulfonic ionexchange membranes[J]. Energy&Environmental Science,2012,5(2):5690-5693.
[7] COSTA C M,RIBELLES J L G,LANCEROS-MENDEZ S,et al. Poly(vinyldene fluoride)-based, co-polymer separator electrolyte membranes for lithium-ion battery systems[J]. Journal of Power Sources,2014,245:779-786.
[8] YOO Y,KIM B G,PAK K,et al. Initiated chemical vapor deposition(i CVD)of highly cross-linked polymer films for advanced lithium-ion battery seperators[J]. ACS Applied Material&Interfaces,2015,7(33):18849-18855.
[9]徐定宇,李跃进,刘长维.超高分子量聚乙烯(UHM-WPE)的流动改性[J].高分子材料科学与工程,1992,8(1):68-72.
[10] CROCE F,FOCARETE M L,HASSOUN J,et al. A safe,high-rate and high-energy polymer lithium-ion battery based on gelled membrane prepared electrospinning[J]. Energy&Environmental Science,2011,4(3):921-927.
[11] ZHANG J,CHEN S,XIE X,et al. Porous poly(vinylidene fluoride-cohexafluoropropylene)polymer membrane with sandwich-like architecture for highly safe lithium ion batteries[J]. Journal of Membrane Science,2014,472(3/4):133-140.
[12] TABATABAEI S H,CARREAU P J,AJJI A. Microporousmenbranes obtained from PP/HDPE multilayer films by stretching[J]. Journal of Membrane Science,2009,345(1/2):148-159.
[13] WANG Q,SONG W,WANG L,et al. Electrospun polyimide-based fiber membrane as polymer electrolytes for lithium-ion batteries[J].Electrochimica Acta,2014,132:538-544.
[14] WANG J,HU Z,YIN X,et al. Alumina/phenolphthalein polyetherketone ceramic composite polypropylene separator film for lithium lon power batteries[J]. Electrochimica Acta,2015,159:61-65.
[15] XIAO S,WANG F,YANG Y,et al. An environmentally friendly and economic membrane based on cellulose as a gel polymer electrolyte for lithium ion batteries[J]. Royal Society Of Chemistry:2014,4(1):76-81.
[16] ZHANG Y,ROHAN R,SUN Y,et al. A gel single ion polymer electrolyte membrane for lithium-ion batteries with wide-temperature range operability[J]. Royal Society Of Chemistry,2014,4(40):21163-21170.