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- W3045643456 abstract "Rechargeable lithiumion batteries (LIBs) are widely used in various daily life applicationsincluding electronic portabledevices,cell phones, militaryapplications, and electric vehicles throughout the world.The demand for building a safer andhigher volumetric/gravimetric energy density LIBs has increased exponentiallyfor electronic devices and electric vehicles. With the high energy density andlonger cycle life, the LIBs are the most prominent energy storage system for electric vehicles. Researchers are furtherexploring for new materials with a high specific capacity, the MXenehas been a promising new anode material for LIBs. The typical MXene material Ti3C2Tzhas 447mAh/g theoretical capacity, which is higher than traditional graphite(372 mAh/g for LiC6) based anode.Though LIBs are used in most of theportable energy storage devices, LIBs are still having thermal runaway safetyconcern, which is caused by three main reasons: mechanical,electrical, and thermal abuse. Thethermal runaway is caused by the initiation of solid electrolyte interface(SEI) degradation above 80 °C on the anode surface, generating exothermic heat,and further increasing battery temperature. The SEI is a thin layer formed onanode due to electrolyte decomposition during first few charging cycles. Itsdegradation at low temperature generates heat inside the LIBs and triggers thethermal runaway. Thethermal runaway follows SEI degradation, electrolyte reactions, polypropyleneseparator melting, cathode decomposition and finally leads to combustion. The thermalrunaway mechanism of graphite, which is the most common and commercializedanode material of LIBs, has been studied for years. However,the thermal safety aspects of the new MXene material has not been investigatedyet. Inthis thesis, we primarily used differential scanning calorimetry (DSC) and speciallydesigned multi module calorimetry (MMC) to measure exothermic and endothermicheat generated at Ti3C2Tz anode,associated with multiple chemical reactions as the temperature increases. The in-situ MMC technique is employed tostudy the interactions and chemical reactions of all the components (separator,electrolyte, cathode and MXene anode) in the coin cell for the first time,while the ex-situ DSC is used to investigate the reactions happened onanode side, including electrolyte, PVDF binder, MXene, SEI and intercalated Li.Along with other complementary instruments and methods, the morphological, structural and compositionalstudies are carried out using X-raydiffraction (XRD), Raman spectroscopy, scanning electron microscope (SEM),energy-dispersive X-ray spectroscopy (EDX), Brunauer-Emmett-Teller (BET) surface area measurement and electrochemicalmeasurement to support the thermal analysis. The electrochemical and thermal runaway mechanism of conventional graphitic anode is studied and used for comparison with MXene anodes.TheTi3C2Tz thermal runaway is triggered by SEIdecomposition around 120 °C analogous to conventional graphite. The thermal behavior of Ti3C2Tzanode is highly dependent onelectrode material, surface area, lithiation states, surface morphology,structure and surface-terminating functional groups on Ti3C2Tz, which provides more active lithiumsites for exothermic reactions with the electrolyte. Especiallythe terminal groups (-OH, -F, =O, etc.) from the etching process affect thelithium ion intercalation and thermal runaway mechanism. With annealingtreatment, the surface-terminating functional groups are modified and canachieve less exothermic heat release. By normalizing the total heat generationby specific capacities of the anode materials, it is observed that Ti3C2Tz(2.68 J/mAh) generates slightly less exothermic heat than graphite (2.72 J/mAh)indicating slightly safer nature of Ti3C2Tzanode. The in-situ thermal analysisresults on the Ti3C2Tz half-cell exhibitedless total heat generation per mass (1.56 kJ/g) compared to graphite (1.59 kJ/g)half-cell." @default.
- W3045643456 created "2020-08-03" @default.
- W3045643456 creator A5018888030 @default.
- W3045643456 date "2020-07-29" @default.
- W3045643456 modified "2023-09-27" @default.
- W3045643456 title "THE THERMAL SAFETY UNDERSTANDING OF MXENE ANODES IN LITHIUM-ION BATTERIES" @default.
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- W3045643456 doi "https://doi.org/10.25394/pgs.12722114.v1" @default.
- W3045643456 hasPublicationYear "2020" @default.
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