開(kāi)發(fā)低成本的儲(chǔ)能體系對(duì)于大規(guī)模實(shí)施可再生能源技術(shù)和改善電網(wǎng)儲(chǔ)能至關(guān)重要。當(dāng)前已商用的電子設(shè)備用電池價(jià)格相對(duì)較高,其性能同時(shí)也需要進(jìn)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(yīng)用的優(yōu)勢(shì)。為了更好地探究高性能鈉離子電池的電化學(xué)性能和構(gòu)效關(guān)系,仍需要對(duì)電極材料進(jìn)行廣泛的研究。本文即針對(duì)低成本的Na_2/3[Fe_x Mn_1-x]O₂材料的合成和電化學(xué)性能進(jìn)行相關(guān)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(duì)環(huán)境友好且成本低廉。采用XRD、SEM和ICP技術(shù)分別對(duì)材料的結(jié)晶度、形貌和組成進(jìn)行了表征。通過(guò)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(guò)對(duì)不同鐵含量(x=0.1,0.2,0.3,0.4和0.5)的NFMO材料進(jìn)行研究,發(fā)現(xiàn)當(dāng)x=0.1時(shí)材料具有最佳的電化學(xué)性能,Na_2/3...

【文章頁(yè)數(shù)】：74 頁(yè)

【學(xué)位級(jí)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(hào)：3927067

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