開發(fā)低成本的儲能體系對于大規(guī)模實施可再生能源技術和改善電網儲能至關重要。當前已商用的電子設備用電池價格相對較高,其性能同時也需要進一步提升以滿足更高需求。鈉離子電池由于鈉原材料(如蘇打灰、鹽等)豐富、便宜且分布廣泛,因此具有可大規(guī)模應用的優(yōu)勢。為了更好地探究高性能鈉離子電池的電化學性能和構效關系,仍需要對電極材料進行廣泛的研究。本文即針對低成本的Na_2/3[Fe_x Mn_1-x]O₂材料的合成和電化學性能進行相關研究。P2-型Na_2/3[Fe_xMn_1-x]O₂(NFMO)中鈉離子位于三棱柱位置,該材料對環(huán)境友好且成本低廉。采用XRD、SEM和ICP技術分別對材料的結晶度、形貌和組成進行了表征。通過摻雜條件的優(yōu)化,雖然材料的比容量略微下降,卻明顯提升了材料的循環(huán)穩(wěn)定性。通過對不同鐵含量(x=0.1,0.2,0.3,0.4和0.5)的NFMO材料進行研究,發(fā)現(xiàn)當x=0.1時材料具有最佳的電化學性能,Na_2/3...

【文章頁數(shù)】：74 頁

【學位級別】：碩士

【文章目錄】：
摘要
ABSTRACT
Chapter 1 Intoduction
    1.1 Research Background
    1.2 Sodium-ion battery history and working principle
    1.3 Sodium ion battery cathode materials
        1.3.1 Polyanionic cathode material
        1.3.2 Fluoride material
        1.3.3 Layered oxides
        1.3.4 Brief summary
    1.4 Anode materials
        1.4.1 Carbon materials
        1.4.2 Metallic/semimetallic elemental and alloyed materials
        1.4.3 Organic anode materials
    1.5.Sodium ion battery electrolyte
Chapter 2 Intoduction Experimental material reagents,instruments andcharacterization methods
    2.1 Experimental preparations and test instruments
    2.2 Characterization of physical properties of materials
        2.2.1 X-ray diffraction analysis(XRD)
        2.2.2 Scanning Electron Microscopy(SEM)
        2.2.3 Atomic Emission Spectroscopy(ICP)
    2.3 Material test for electrochemical properties
        2.3.1 Battery Assembly
        2.3.2 Checking charge and discharge at constant current
        2.3.3 AC Impedance Test(EIS)
        2.3.4 Cyclic voltammetry results(CV)
Chapter 3 Effect of doping Fe on Crystal Structure,Morphology andElectrochemical Properties of Na_2/3MnO2

    3.1 Introduction
    3.2 Na_2/3[Fe_xMn_1-x]O₂ Material characterization
        3.2.1 X-ray diffraction characterization(XRD)
        3.2.2 Scanning electron microscope(SEM)
        3.2.3 Plasma emission spectroscopy(ICP)
    3.3 Electrochemical performance
        3.3.1 Cyclic voltammetry results(CV)
        3.3.2 Cycle performance and rate capability
        3.3.3 Electrochemical impedance spectroscopy
    3.4 Electrochemical performance of NFMO-01
    3.5 Summary
Chapter 4 Effect of temperature on the performance of Na_2/3[Fe_0.1Mn_0.9]O₂

    4.1 Introduction
    4.2 Na_2/3[Fe_0.1Mn_0.9]O₂ Material characterization
        4.2.1 X-ray diffraction characterization(XRD)
        4.2.2 Scanning electron microscope(SEM)
        4.2.3 Plasma emission spectroscopy(ICP)
    4.3 Electrochemical performance of Na_2/3[Fe_0.1Mn_0.9]O₂

        4.3.1 Cycle performance and rate capability
        4.3.2 Cyclic voltammetry results(CV)
    4.4 Electrochemical impedance spectroscopy
    4.5 Summary
Conclusion
Acknowledgements
Reference



本文編號：3927067

suoshi