静电纺丝制备动力锂离子电池隔膜的关键技术与设备-材料工程专业论文.docx

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2018-05-05 发布于上海
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静电纺丝制备动力锂离子电池隔膜的关键技术与设备-材料工程专业论文.docx

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静电纺丝制备动力锂离子电池隔膜的关键技术与设备-材料工程专业论文

AbstractAtpresent,itisbecausethatithashighoperationalvoltage,highspecificenergy,highenergydensity,longcyclelifetime,lowself-dischargerate,smallenvironmentalpollution,nomemoryeffect,andsoon,lithium-ionbatteries becomethemainpowerofmanyelectronicproducts.Withtherapiddevelopmentofnewenergyvehicles,having morerapidperformanceofchargingand discharging,securityandseparatorstabilityarenecessaryforlithium-onbattery. Inordertorealizethat,itisoneofthemostdifficultproblemsthatnoenough outputandhighqualityofseparatorareproducedbytraditionalproduction process.Therefore,itisnecessarytoresearchnewproductionequipmentand processfordevelopingseparatorofpowerlithium-onbattery.Inthisdissertation,separatorsoflithium-onbatteryweremadeby electrospinning.In ordertoimproveoutputofseparator,many varietiesofno nozzleelectrospinningequipmentwereinventedindependently.Withmany varietieskindsofpolymernanofibermembraneswereproducedbydifferentelectrospinningequipments.The fibermembranes werecharacterized, and thePVDF-PMMAcompositenanofibermembraneswereusedastheseparatorof lithium-onbattery,andtheirelectrochemicalperformancewastested.Thepropertyoftheequipmentsdevelopedherecouldbeevaluatedbythecharacterizationdata.Themainresearchcontentsareasfollows.Basedonthebasicprinciplesofelectrospinning,wedesignedmanysetsofjet,collectingandsupplydevicesthroughanalyzingtheformingprocessand conditionsoftheTaylorconeduringelectrospinningprocess.Thejetdevices includedplanar metal,metalroller(drum)and metal wire,andthe collecting devicesincludedrotatingrollerandconveyor.Comparedwithsinglenozzle,thedevelopedelectrospinningequipmentincreasedthreeordersofmagnitudein yield.ThepolymerfibermembraneofPVAandPEOandthecompositefiber membraneofPVA-PEO,PVA-PVP,andPVDF-PMMAwerefabricatedbyusing differentelectrospinningdevices,andthenthesesampleswerecharacterizedand analyzed.Theresultsshowedthatthespinningthreshold voltageoftheroller (drum)jetdevicewasbetween60to70kV,thespeedofjettingwasfast,thefiber waseasytoadherewitheachot