Effect of the Amorphisation of Zeolitic Imidazole Frameworks on the Electrochemical Performance of Anodes
Author
Winters, Wessel Martinus Wilhelmus
Term
4. term
Education
Publication year
2021
Submitted on
2021-08-02
Pages
69
Abstract
This thesis examines how amorphization of zeolitic imidazolate frameworks (ZIF) influences the electrochemical performance of anodes in lithium-ion batteries. ZIF-62(Co) and ZIF-67 were synthesized and rendered amorphous by melt-quenching and ball-milling, respectively. The materials were evaluated using galvanostatic charge–discharge cycling, electrochemical impedance spectroscopy (EIS), and cyclic voltammetry (CV), and their physical and structural properties were characterized by powder X-ray diffraction (PXRD), differential scanning calorimetry (DSC), X-ray photoelectron spectroscopy (XPS), and infrared spectroscopy (IR). Findings indicate that ball-milling alters the electrochemical behavior of ZIF-67, and all samples show an ability to recover capacity lost during the initial cycles. The work advances understanding of how order–disorder transitions in ZIF materials relate to anode performance.
Dette speciale undersøger, hvordan amorfisering af zeolitiske imidazolat-frameworks (ZIF) påvirker anoders elektrokemiske ydeevne i lithium-ion-batterier. ZIF-62(Co) og ZIF-67 blev syntetiseret og gjort amorfe via henholdsvis smelte-quenchning (hurtig nedkøling fra smelte) og kuglemaling. Materialerne blev testet med galvanostatiske lade-aflade-cyklusser, elektrokemisk impedansspektroskopi (EIS) og cyklisk voltammetri (CV), og deres strukturelle og fysiske egenskaber blev karakteriseret med pulverrøntgendiffraktion (PXRD), differential scanning calorimetry (DSC), røntgenfotoelektronspektroskopi (XPS) og infrarød spektroskopi (IR). Resultaterne indikerer, at kuglemaling ændrer den elektrokemiske ydeevne for ZIF-67, og at alle undersøgte prøver kan genvinde kapacitet, der går tabt i de første cyklusser. Arbejdet bidrager til forståelsen af sammenhængen mellem orden–uorden i ZIF-materialer og deres funktion som anoder.
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