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1、会计学1硅碳电池硅碳电池(dinch)BatterySeminarSi第一页，共21页。Outline1.Introduction2.Advanced Silicon Anode for Li Batteries (1)Si Nanoparticle-Based Electrodes(2)Engineering Si-Based electrodes3.Conclusions2第1页/共20页第二页，共21页。Importance of Electrical Energy StorageWind Oceans SolarPortable ElectronicsElectric Vehicles
2、Renewable Energy Storage&GridWearable&Implantable Devices3第2页/共20页第三页，共21页。Electrical Energy Storage TechnologiesEnergy DensityPower DensityCycle Life&SafetyCost4第3页/共20页第四页，共21页。Introduction-Rechargeable Lithium-Ion BatteriesEnergy densityHigher than most of other batteriesStill cannot meet the EV
3、applicationsvLiMO2/C battery(M=Ni,Co,Mn)OCV:3.9 V180 mA h g-1440 W h kg-1(Practical:150 W h kg-1)5第4页/共20页第五页，共21页。Current LimitationsMaterials ChallengesoLow Theoretical Specific CapacityoLimited Operating VoltageoCycling Stability/SafetyoCost/AbundanceFabrication ChallengesoNanomaterialsoElectrode
4、 StructuresoTechnologies6第5页/共20页第六页，共21页。Silicon AnodeHigh Energy DensityPoor Cycling Stability1.High Gravimetric Capacity&Volumetric Capacity2.Abundance1.Large Volume Change2.PulverizationB.J.Landi,*C.D.Cress,Energy and Environmental Science,2009,2,638-654.7第6页/共20页第七页，共21页。Our Solutions1.Nanostru
5、ctured Si materialsElevation of absolute volume changeShortened diffusion length2.Design of robust composite material architectureLarge void space for volume change Electron and ion transportation pathways Robustness3.Fabrication and engineering of Si-based electrodes and tin based electrodesImprove
6、d integrity of the electrodesScalable production in the form of particlesCompatible with current device-fabrication technology(thick electrode)8第7页/共20页第八页，共21页。Solution 1-Engineering Si Based ElectrodesFlash Heat TreatmentF.Hassan,X.Xiao*,Z.Chen*,Nano Letters,2014,14(1),277-283.Rapid thermal shock
7、at 900oC Hold at 900oC for 10 min.Rapid coolingSiSiSiSiSiSi+4 PVDF6 SiNP 9第8页/共20页第九页，共21页。Solution 1-Engineering Si Based ElectrodesInterface StructureF.Hassan,X.Xiao*,Z.Chen*,Nano Letters,2014,14(1),277-283.FHT treatment-Carbonized PVDF Carbon shell around Si-Porosity to compensate volume expansio
8、n-Graphene and copper silicide at the interface fix to copper Well-adhered coatingGraphene interface10第9页/共20页第十页，共21页。Solution 1-Engineering Si Based ElectrodesMorphologyF.Hassan,X.Xiao*,Z.Chen*,Nano Letters,2014,14(1),277-283.SiSiSi core10 nmSiOxSiEELSSi(core)SiO2(inner shell)Carbon(outer shell)Co
9、nductively connect the particles11第10页/共20页第十一页，共21页。Solution 1-Engineering Si Based ElectrodesCycling PerformanceF.Hassan,X.Xiao*,Z.Chen*,Nano Letters,2014,14(1),277-283.70%1st Cycle eff.Decay rapidly 85%1st Cycle eff.Above 99%after Capacity is over 3000 mAh/gNon-FHT treatedFHT treated12第11页/共20页第十
10、二页，共21页。Solution 1-Engineering Si Based ElectrodesRate PerformanceF.Hassan,X.Xiao*,Z.Chen*,Nano Letters,2014,14(1),277-283.1350 mA h g-1 after switching to 1.2 A g-1.99.8%cyclic efficiency13第12页/共20页第十三页，共21页。Solution 2-Engineering Si Based ElectrodesBinding Si to S-doped GrapheneF.Hassan,X.Xiao*,Z.
11、Chen*,Nature Communications,Under Review,2015.SiSiSiSiSiSi+SiNP PAN SG GOMixing under ultrasonic irradiation Coating Sluggish heating to 450oC Hold 10 min.Furnace cool14第13页/共20页第十四页，共21页。Solution 2-Engineering Si Based ElectrodesMorphologySi covalently bonded to SGWrapped with cyclized PAN3-D of en
12、hanced conductivityRobustnessF.Hassan,X.Xiao*,Z.Chen*,Nature Communications,Under Review,2015.15第14页/共20页第十五页，共21页。Solution 2-Engineering Si Based ElectrodesStructure elucidationPolyacrylonitrile cyclize leading to better conductivityCoherent structureFlexibleVoids to compensate volume changeF.Hassa
13、n,X.Xiao*,Z.Chen*,Nature Communications,Under Review,2015.16第15页/共20页第十六页，共21页。Solution 2-Engineering Si Based ElectrodesPerformanceSi-grapheneDecaySi-S-graphene stableF.Hassan,X.Xiao*,Z.Chen*,Nature Communications,Under Review,2015.17Initial capacity:2865 mAh/g;3.5 mAh cm-2 Initial Efficiency:86.2%
14、Excellent rate capability 2 A g-1,1033 mAh g-1,for 2200 cycles第16页/共20页第十七页，共21页。Solution 2-Engineering Si Based ElectrodesStructure after CyclingCrystalline silicon by cycling turn to amorphous nanowire-like structure caged in synergistic 3D of SG and caged by cyclized PolyacrylonitrileSulfurCarbon
15、SiliconF.Hassan,X.Xiao*,Z.Chen*,Nature Communications,Under Review,2015.18第17页/共20页第十八页，共21页。Solution 2-Engineering Si Based ElectrodesDFT CalculationsDFT calculation showed that Silicon binds to S-graphene 8 times stronger than its binding to grapheneF.Hassan,X.Xiao*,Z.Chen*,Nature Communications,U
16、nder Review,2015.19第18页/共20页第十九页，共21页。ConclusionLow cost,simple,scalable engineered Si electrode fabrication methodology allows 2000+cycles of cells with 1000 mAh/g at a 2 A/g and enables high-energy performance:which could reach 3.5 mAh/cm2.20Covalent synergy in silicon-sulfur-graphene yielding highly efficient and long-life lithium-ion batteries.第19页/共20页第二十页，共21页。21感谢您的观看(gunkn)。第20页/共20页第二十一页，共21页。