文档名：弹性聚合物固态电解质界面膜保护金属锂负极
摘要：固态电解质界面膜(SEI)的性质直接影响着锂金属电池中金属锂负极的稳定性.本文通过原位紫外光聚合方法构筑了弹性聚合物人工固态电解质界面膜(EP-SEI)保护的金属锂负极.这种EP-SEI具有优异的均匀性、稳定性和弹性,在电池循环中促进锂离子均匀沉积.这些特性可以抑制锂枝晶的生成,缓冲金属锂负极在循环时的体积变化,有效保护金属锂负极.这种EP-SEI保护的金属锂负极组装的LFP||Li电池和NCM811||Li电池在0.5C倍率下的最高容量分别可达到164.1mA·h·g-1和187.1mA·h·g-1,并稳定循环500圈.
Abstract：IntroductionLithiummetalbatteries(LMBs)areregardedascandidatesfornext-generationbatteriesduetotheirlowelectrochemicalpotential(i.e.,-3.040Vvs.standardhydrogenelectrode)andhightheoreticalspecificcapacity(i.e.,3860mA?h·g-1).Lithium(Li)metalanodeissusceptibletosidereactionswithorganicelectrolytes,leadingtotheunevenformationofthesolidelectrolyteinterphase(SEI).Thenon-uniformityandfragilityoftheSEIcanaggravatethegrowthofLidendritesandexcessiveelectrolyteconsumption,ultimatelyresultinginarapidattenuationofcapacityandsafetyrisks.TheseissuesseverelyhinderthecommercializationofLMBs.ThedevelopmentofanartificialSEIiscrucialforprotectingLimetalanode,suppressingLidendritegrowth,andaccommodatingvolumechangesduringcycling.ThisadvancementisessentialforimprovingthestabilityandcyclinglifeofLMBs.Inthispaper,wesynthesizedanartificialelasticpolymerSEI(EP-SEI)constructedonthesurfaceofLimetalanodebyanin-situUV-curingmethod.ThemaincompositionofEP-SEIwaspoly(ethyleneglycol)diacrylate-co-vinylenecarbonate(PEGDA-CO-VC)cross-linkingpolymer.MethodsForthesynthesisofanartificialelasticpolymerSEI(EP-SEI)constructedonthesurfaceofLimetalanodebyanin-situUV-curingmethod,polyethyleneglycoldiacrylate(PEGDA)andvinylenecarbonate(VC)weremixedinamassratioof4:1(i.e.,80mgand20mg)understirring.Afterwards,2mLofdimethoxyethane(DME)wasaddedfordissolution.Subsequently,themixturewasdrippedontoLimetalfoils,followedbypolymerizationunderamercurylampaftertheadditionof2-hydroxy-2-methylpropiophenone(HMPP).ThismethodutilizedUVlighttorapidlyexcitetheunsaturatedbondsofpolymermonomers,therebyshorteningthepolymerizationreactiontimeandenhancingthepreparationefficiencyoftheartificialSEI.Thismethodwassimpletooperate,conducivetobatchproduction,andaidsinadvancingthecommercializationofLMB.TheLMBswereassembledwithLiFePO4(LFP)orLiNi0.8Co0.1Mn0.1O2(NCM811)asacathodematerial,Limetalfoilasananode,polypropylene(PP)asaseparator,and1MLiPF6EC/DECasanelectrolyte.Thebatterieswereassembledinagloveboxfilledwithargontoensureamoisture-freeandoxygen-freeenvironmentduringtheprocess.ResultsanddiscussionAnartificialEP-SEIwithPEGDA-co-VCwaspreparedonthesurfaceofLimetalbyanin-situUV-curingpolymerizationmethod.ThethicknessofEP-SEIis1.6μm.TheEP-SEIexhibitsanuniformanddensemorphologyandtightlycoversthesurfaceofLimetal.Intheresultsofelectrochemicaltest,Lisymmetric(Li||Li)cellsassembledwithEP-SEIprotectedLiexhibithighlyreversibleelectrochemicalbehaviorandfasterchargetransferrates.TheLi||LicellswithEP-SEILimaintainstablecyclingatacurrentdensityof1mA?cm-2andacapacitydensityof1mA?h?cm-2forover300h.AndtheimpedancevaluesofLi||LicellswithEP-SEILicontinuouslydecreaseduringthecycle,andeventuallystabilizeat15Ω.ThisindicatesthatEP-SEIexhibitsahighstabilityduringprolongedelectrochemicalreactionsandahighlithiumionconductivity.IntheresultsofLi||Cucellstest,thelownucleationoverpotential(μnuc)andplateaupotential(μpla)indicateareductioninthenucleationenergybarrierforLideposition.ItisconfirmedthatEP-SEIcanpromotetheuniformdepositionofLi+onthesurfaceofLimetal.AftercyclingofLi||CucellwithEP-SEICu,thethicknessofLi+depositionapproachesthetheoreticalthickness.ThesurfaceofEP-SEICuremainssmoothandflatwithoutthegrowthofLidendrites.Intheresultsoffullcelltest,theLFP||LibatterieswithEP-SEILiexhibitadischargespecificcapacityof164.1mA?h·g-1andacapacityretentionrateof72%after500cycleswithacoulombicefficiencyof98.5%at0.5Crate.TheNCM811||LibatterieswithEP-SEILimaintainadischargespecificcapacityof100mA?h·g-1after500cycles.ThisdemonstratesthatEP-SEIeffectivelyreduceselectrolyteconsumptionandimprovescoulombefficiency,cyclestabilityandsafetyofLMBs.ConclusionsInthisstudy,anelasticpolymerartificialsolidelectrolyteinterphasemembrane(EP-SEI)wasconstructedontheLimetalanodebyanin-situUV-curingpolymerizationmethod.ThisEP-SEIexhibitedexcellentuniformity,stabilityandelasticity,promotingtheuniformdepositionofLi+duringcycling.ThesepropertiesindicatedthatEP-SEIcouldinhibitLidendriteformation,bufferthevolumechangesoftheLimetalanode,andreduceelectrolyteconsumption.TheLFP||LiandNCM811||LibatteriesassembledwithEP-SEI-protectedLimetalanodesachieveddischargespecificcapacitiesof164.1mA·h·g-1and187.1mA·h·g-1at0.5Crate,respectively.TheLMBsmaintainedstablecyclingfor500cycles.TheEP-SEIcouldeffectivelyprotecttheLimetalanode,improvethecoulombicefficiencyandextendthecyclinglifeofLMB.TheEP-SEIprotectedLimetalanodeprovidedthepossibilitiesforthecommercializationofLMBs.
作者：卢微 王子豪 赵安顺 于明希 杜米 赵雪 张文静 刘梅 冯明 Author：LUWei WANGZihao ZHAOAnshun YUMingxi DUMi ZHAOXue ZHANGWenjing LIUMei FENGMing
作者单位：吉林师范大学,功能材料物理与化学教育部重点实验室,长春130103;吉林师范大学信息技术学院,吉林四平136000吉林师范大学,功能材料物理与化学教育部重点实验室,长春130103;吉林师范大学物理学院,吉林四平136000吉林师范大学物理学院,吉林四平136000
刊名：硅酸盐学报 ISTICEIPKU
Journal：JournaloftheChineseCeramicSociety
年，卷(期)：2024, 52(7)
分类号：TB332
关键词：人工固态电解质界面 金属锂负极 锂金属电池 聚合物 高弹性
Keywords：artificialsolidelectrolyteinterphase lithiummetalanode lithiummetalbattery polymer highelasticity
机标分类号：TM912O657.23TQ131.11
在线出版日期：2024年7月24日
基金项目：吉林省科技厅项目弹性聚合物固态电解质界面膜保护金属锂负极[
期刊论文] 硅酸盐学报--2024, 52(7)卢微 王子豪 赵安顺 于明希 杜米 赵雪 张文静 刘梅 冯明固态电解质界面膜(SEI)的性质直接影响着锂金属电池中金属锂负极的稳定性.本文通过原位紫外光聚合方法构筑了弹性聚合物人工固态电解质界面膜(EP-SEI)保护的金属锂负极.这种EP-SEI具有优异的均匀性、稳定性和弹性,在电池...参考文献和引证文献
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