硅碳电池BatterySeminarSi学习教案

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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。1. 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。Wind Oceans SolarPortable ElectronicsElectric VehiclesRenewable Energy Storage & GridWearable &

2、 Implantable Devices3第2页/共20页第三页，共21页。Energy DensityPower DensityCycle Life & SafetyCost4第3页/共20页第四页，共21页。Energy densityHigher than most of other batteriesStill cannot meet the EV applicationsv LiMO2/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

3、21页。Materials Challengeso Low Theoretical Specific Capacityo Limited Operating Voltageo Cycling Stability/Safetyo Cost/AbundanceFabrication Challengeso Nanomaterialso Electrode Structureso Technologies6第5页/共20页第六页，共21页。High Energy DensityPoor Cycling Stability1. High Gravimetric Capacity & Volumetri

4、c 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。1. Nanostructured Si materialsElevation of absolute volume changeShortened diffusion length2. Design of robust composite material architectureLarg

5、e void space for volume change Electron and ion transportation pathways Robustness3. Fabrication and engineering of Si-based electrodes and tin based electrodesImproved integrity of the electrodesScalable production in the form of particlesCompatible with current device-fabrication technology (thick

6、 electrode)8第7页/共20页第八页，共21页。Flash Heat TreatmentF. Hassan, X. Xiao*, Z. Chen*, Nano Letters, 2014, 14(1), 277-283. Rapid thermal shock 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。Interface StructureF. Hassan, X. Xiao*, Z. Chen*, Nano Letters, 2014, 14

7、(1), 277-283. FHT treatment-Carbonized PVDF Carbon shell around Si-Porosity to compensate volume expansion-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。MorphologyF. Hassan, X. Xiao*, Z. Chen*, Nano Letters, 2014, 14(1), 277-283.

8、 SiSiSi core10 nmSiOxSiEELSSi (core) SiO2 (inner shell) Carbon (outer shell) Conductively connect the particles11第10页/共20页第十一页，共21页。Cycling 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 ove

9、r 3000 mAh/gNon-FHT treatedFHT treated12第11页/共20页第十二页，共21页。Rate 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。Binding Si to S-doped GrapheneF. Hassan, X. Xiao*, Z. Chen*, Nature Co

10、mmunications, Under Review, 2015. SiSiSiSiSiSi+OSSSSOOSSSOO HO HH OOOOOH OOOOH OH OOH OOH OOOH OO HOH OOH OOOOH O+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。MorphologySi covalently bonded to SGWrapped with cyclize

11、d PAN3-D of enhanced 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。Structure elucidationPolyacrylonitrile cyclize leading to better conductivityCoherent structureFlexibleVoids to compensate volume changeF. Hassan, X. Xiao*, Z. Ch

12、en*, Nature Communications, Under Review, 2015. 16第15页/共20页第十六页，共21页。PerformanceSi-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% Excellent rate capability 2 A g-1 , 103

13、3 mAh g-1, for 2200 cycles第16页/共20页第十七页，共21页。Structure after CyclingCrystalline silicon by cycling turn to amorphous nanowire-like structure caged in synergistic 3D of SG and caged by cyclized PolyacrylonitrileSulfurCarbonSiliconF. Hassan, X. Xiao*, Z. Chen*, Nature Communications, Under Review, 201

14、5. 18第17页/共20页第十八页，共21页。DFT CalculationsDFT calculation showed that Silicon binds to S-graphene 8 times stronger than its binding to grapheneF. Hassan, X. Xiao*, Z. Chen*, Nature Communications, Under Review, 2015. 19第18页/共20页第十九页，共21页。Low 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。