6436

6010

كارشناسي ارشد

شيمي نساجي و علوم الياف

اصفهان: دانشگاه صنعتي اصفهان، دانشكده نساجي

1390

دوازده، 110ص.: مصور، جدول، نمودار

ص.ع. به فارسي و انگليسي

محمد مرشد، داريوش سمناني

بهزاد رضايي

7/10/90

مصطفي يوسفي، علي اصغر انصافي

1396/10/12

كتابنامه

نساجي

مهندسي نساجي

ID6010

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

۱۱۱ Evaluation of Electrical Transmission of Nano Fibers Web in Charging Process of Li ion Batteries by Using Complex Methods of Artificial Intelligence Mahvash Shokrollahi m shokrollahi@tx iut ac ir Date of Submission 27 9 2011 Department of Textile Engineering Isfahan University of Technology Isfahan 84156 83111 IranDegree M Sc Language FarsiSupervisors M Morshed morshed@cc iut ac ir D Semnani semnani@cc iut ac irAbstract Secondary lithium ion Li ion batteries provide an attractive landscape for energy storage systems due totheir high specific energy high energy density long lifetime cycle cycles low selfdischarge rate and high operational voltage They have been widely used in consumer electronics such as portable computers camcorders and cell phones Recently their applications have been expanding into aerospace technology electric vehicles EV and hybridelectric vehicles HEV the four fundamental components of a Li ionbattery are the negative electrode anode the positive electrode cathode the electrolyte and the separator The first three components participate in the electrochemical reactions in a battery cell while the separator isan inactive component The only inactive fundamental component of a Li ion battery cell is the separator necessarily sandwiched between the anode and cathode A separator is a porous membrane placed betweenelectrodes of opposite polarity permeable to ionic flow but preventing electric contact of the electrodes Polymer electrolytes PEs have attracted great interest compared to traditional liquid electrolytes whichprovide the advantages to develop lighter and safer batteries with long shelf life leak proof construction andeasy fabrication into desired shape and size rechargeable batteries In the present research firstly poly vinylalcohol titanium oxide PVA TiO2 nanofibers were produced from appropriate dispersions of titaniumoxide nanoparticles with different weight percentages in distillated water and addition of 9wt PVAaqeous solutions in to suspension of TiO2 by electrospinning technique Morphological studies of PVA TiO2nanofibers performed with optical microscopy and scanning electron microscopy and proved uniform beadfree structure for nanofibers containing TiO2 nanoparticles The average fiber diameter increased withincreasing the content of TiO2 nanoparticles to 20 wt as a result of increased viscosity In the next step theporosity of the membranes was evaluated following the n butanol uptake method and image processing Anappropriate porosity is necessary to hold sufficient liquid electrolyte for the ionic conductivity between theelectrodes which ensure small internal resistance of batteries PVA TiO2 membranes exhibits a porosity of 79 91 by n butanol method Permeability studies were also carried out using air permeability method The result of measuring permeability showed that with increase content of TiO2 as a result of increasedaverage fiber diameter the permeability of polymer electrolytes was increased The thermal properties andcrystal structure of the EPs also were investigated by Thermal Gravimetry Analysis TGA and X raydiffraction According to the X ray diffraction XRD studies the percentage of amorphous regions increasedin PVA electrospun membrane with incorporation of the TiO2 nanoparticles Also the results ofthermogravimetric analysis showed the improved thermal stability of the the incorporation of TiO2 into thenanofiber membrane improved The PVA TiO2 based fibrous polymer electrolytes were prepared by soakingfibrous membranes in an electrolyte solution namely a 1M PerChlorate Lithium LiClO4 in ethylenecarbonate EC dimethy carbonate DMC 1 1 by weight solution for 24 h With increasing of the TiO2

محمد مرشد، داريوش سمناني

بهزاد رضايي

مصطفي يوسفي، علي اصغر انصافي