文献类型：期刊文献

中文题名：聚丙烯超细短纤维锂离子电池隔膜的制备及性能研究

英文题名：Study on the preparation and properties of superfine short polypropylene lithium-ion battery separators

作者：赵德方[1,2,3,4];邓安国[1];黄芽[5];郭薇薇[1];毛加冲[1];奚清瑶[1];李献梅[1];占海华[1,2,3,4]

机构：[1]绍兴文理学院纺织服装学院,浙江绍兴312000;[2]绍兴文理学院浙江省清洁染整重点实验室,浙江绍兴312000;[3]绍兴文理学院国家碳纤维工程技术研究中心浙江分中心,浙江绍兴312000;[4]绍兴文理学院纤维基复合材料国家工程研究中心绍兴分中心,浙江绍兴312000;[5]凯泰特种纤维科技有限公司,浙江绍兴312000

年份：2022

卷号：59

期号：4

起止页码：24

中文期刊名：丝绸

外文期刊名：Journal of Silk

收录：CSTPCD、、Scopus、北大核心、CSCD、北大核心2020、CSCD_E2021_2022

基金：绍兴市技术创新计划项目(2019B22002);浙江省大学生科技创新项目(2019R432005)。

语种：中文

中文关键词：聚丙烯;超细纤维;分散性能;锂离子电池隔膜;湿法抄造工艺;孔隙率

外文关键词：polypropylene;superfine fiber;dispersing property;lithium-ion battery separators;wet papermaking process;porosity

中文摘要：电池隔膜作为动力电池关键的内层组件之一,是具有一定技术壁垒的高附加值材料。然而,目前国产的锂离子电池隔膜质量不稳定,很难满足在孔隙率、孔径分布、厚度等方面的技术要求。本研究采用不同分散剂对聚丙烯(PP)超细短纤维处理,改善其在浆料中的分散性能,解决了PP超细短纤维分散性差的难题,并采用湿法抄造工艺制备锂离子电池隔膜。结果表明:当采用长度为3 mm的PP超细短纤维,并经预处理后添加8%十二烷基苯磺酸钠(SDBS)与2%有机硅消泡剂,配制成浆料,经抄纸、烘干、135℃热压处理制备的PP锂离子电池隔膜较为理想,制备的电池隔膜兼具良好的力学性能、热稳定性及优异的物理性能,纵向拉伸强度、孔隙率和厚度可达到220.7 MPa,50.6%和21.3μm,性能可媲美商业化的PP锂离子电池隔膜。

外文摘要：New energy vehicles use power batteries to provide vehicle power.Compared with traditional vehicles which use gasoline as fuel,new energy vehicles are more economical and environmentally friendly.In the future,new energy vehicles will replace traditional gasoline vehicles and become the main development trend.As the power of new energy vehicles is provided by batteries,the development of battery technology determines the performance of new energy vehicles,such as endurance,vehicle life,safety performance and so on.Automotive power batteries mainly include lithium-ion batteries,nickel hydrogen batteries and nickel cadmium batteries,among which lithium-ion batteries have become the main automotive power batteries in recent years because of their stable and controllable performance.The battery separators,as one of the core components of the lithium-ion battery,are a high value-added material with certain technical barriers.At present,the quality of domestic lithium-ion battery separators is unstable,and they are difficult to meet the technical requirements in terms of porosity,pore size distribution and thickness.They need to be imported from abroad in the domestic battery industry chain,and the performance of the separators directly determines the battery performance and cost.Common methods for preparing separators in the market include dry preparation process,wet preparation process and non-woven fabric process.Furthermore,separators can be prepared by first preparing non-woven fabrics using electrospinning,melt blowing and paper making process,and then being cured into films by hot pressing or chemical means.The prosperity of the new energy vehicle market has driven the development and innovation of battery separator technology research,and the research based on lithium-ion battery separators has attracted extensive attention.Among them,polyolefin separators(mainly PE,PP and PP/PE/PP multilayers)have low cost and good performance overall,and therefore,they have good prospects and value in the application of lithium-ion battery separators.The research on polyolefin battery separators in China starts relatively late,but with the increasing prosperity of the new energy industry,in recent years,some lithium-ion battery separators in China have realized local production.However,the performance indicators of domestically produced battery still have a large gap compared with those of Japan,the United States,etc.In this study,the polypropylene(PP)ultra-fine filament was cut into PP ultra-fine staple fibers with lengths of 3 mm,6 mm and 9 mm,and five different dispersants including polyethylene oxide(PEO),polyacrylamide(PAM),sodium carboxymethylcellulose(CMC),sodium hexametaphosphate(SHMP)and sodium dodecylbenzene sulfonate(SDBS)were adopted to improve its dispersion in the slurry.In addition,the battery separator paper was prepared by wet forming method,and then PP battery separators were prepared by hot pressing at different temperatures(125℃,130℃,135℃,140℃,145℃).The experiment studied the effects of fiber length,pretreatment,dispersant and other conditions on the mechanical properties,thermal stability,and physical properties of battery separators,and obtained the optimal process parameters for preparing the battery separators.The research results show that the pretreatment can improve the dispersion of PP ultrafine short staple fibers in the slurry,and the addition of SDBS and silicone defoamer can effectively prevent the occurrence of unsmooth peeling during the papermaking process.Fiber length,pretreatment and dispersant have a significant impact on the dispersion property of PP ultrafine short fibers,and the hot-pressing temperature directly affects the performance of battery separators.When PP superfine short fibers of 3 mm are treated by SDBS and 8%SDBS and 2%silicone defoamer are added to prepare the slurry which is pressed at the temperature of 135℃after film formation,ideal lithium-ion battery separators can be prepared.The battery separators prepared in this way exhibit good mechanical properties,thermal stability,and excellent physical properties,and the longitudinal tensile strength,porosity and thickness can reach 220.7 MPa,50.6%and 21.3μm,respectively.This material can become one of the ideal materials to replace the commercial domestic lithium-ion battery separators and bring in great significance to promote the industrial production and application of high-performance domestic lithium-ion battery separators.