文章摘要
静电纺PPEK/SiO2锂离子电池隔膜的制备及性能
Preparation and Properties of PPEK/SiO2 Electrospun Membranes as Lithium Ion Battery Separators
投稿时间:2019-01-11  修订日期:2019-03-23
DOI:
中文关键词: 锂离子电池  隔膜  静电纺丝  聚芳醚酮(PPEK)  二氧化硅  热尺寸稳定性
英文关键词: lithium ion battery  separator  electrospinning  poly(aryl ether ketone)(PPEK)  silicon dioxide  thermal dimensional stability
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
作者单位E-mail
刘落恺 大连理工大学 358541787@qq.com 
唐萍 大连理工大学  
蹇锡高 大连理工大学  
宾月珍 大连理工大学 binyz@dlut.edu.cn 
李隆伟 大连理工大学  
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中文摘要:
      为制备吸液率高、热尺寸稳定性良好的隔膜,以聚芳醚酮(PPEK)和SiO2为原料,采用静电纺丝技术制备了PPEK/SiO2复合纤维膜。通过SEM、电化学工作站、蓝电电池测试系统等对电纺纤维膜及组装的电池进行了结构表征和性能测试,讨论了SiO2质量分数对电纺纤维膜结构和性能的变化规律,并考察了其作为锂离子电池隔膜用时的电化学和电池性能。结果表明:随着SiO2质量分数的增加,电纺纤维膜的孔隙率、吸液率和离子电导率逐渐增加。电纺纤维膜在200 ℃下热处理1 h的热收缩率为0,具有良好的热尺寸稳定性。当SiO2质量分数为6%(以PPEK质量为基准)时,孔隙率和吸液率分别达到179%、1031%,离子电导率为2.63×10-3 S/cm;将该电纺纤维膜组装成石墨/Li电池,1 C下放电比容量为332~350 mAh/g,具有良好的循环和倍率性能。
英文摘要:
      In order to prepare a separator which had high electrolyte uptake and good thermal dimensional stability, the poly(phthalazinone ether ketone)(PPEK)/SiO2 electrospun membranes were prepared by electrospinning technology. The structures and properties of electrospun membranes and batteries were tested by SEM, electrochemical workstation, LAND battery cycle systerm and so on. The structures and thermal properties of the electrospun membranes with different SiO2 content were studied. The electrospun membranes were used as separators to assemble lithium ion batteries, and electrochemical performances and battery performances were studied. The results showed that electrospun membranes’ porosity, electrolyte uptake, ionic conductivity increased gradually with the increase of SiO2 content. The thermal shrinkage rate of PPEK electrospun membranes were 0 when heat treated at 200 °C for 1 h, which displayed good thermal dimensional stability. When the mass fraction of SiO2 was 6%, the porosity and electrolyte uptake reached 179% and 1031%, and ionic conductivity was 2.63×10-3 S/cm. Morever, the discharge capacity of electrospun membrane was 332~350 mAh/g, which exhibited better cycle performance and excellent capacity retention.
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