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Novel Decavanadate Compounds for Lithium-Ion Batteries En Route Towards a New Class of High-performance Energy Materials

:	Simon Greiner
:	Novel Decavanadate Compounds for Lithium-Ion Batteries En Route Towards a New Class of High-performance Energy Materials
:	Springer Spektrum
:	9783658289850
:	1
:	CHF 47.50
:

:	Anorganische Chemie
:	English

:	122
:	Wasserzeichen/DRM
:	PC/MAC/eReader/Tablet
:	PDF

Simon Greiner investigates the molecular-level stabilization of polyoxovanadate (POV) compounds by rational design for the application as active cathode material in lithium-ion batteries. Formation of a complex hydrogen-bonding network locks the POVs in place and prevents thermal decomposition during electrode fabrication. The molecular vanadium oxide clusters can be electrochemically analyzed and show promising results for storage of multiple electrons per cluster, making these materials highly attractive for energy storage applications. Analytical methods comprise ATR-FTIR, powder and single-crystal XRD, electron microscopy, EDX, electrochemical analysis and battery testing.

Simon Greiner obtained his master's degree in chemistry and management at Ulm University, Germany, in cooperation with the Helmholtz Institute Ulm for Electrochemical Energy Storage (HIU). He continues his work on POM-based energy storage materials in the research groups of Prof. Carsten Streb and Prof. Maximilian Fichtner.

	Author Preamble	6
	Table of Contents	7
	List of Figures	9
	List of Tables	12
	Notation	13
	List of Abbreviations	14
	Abstract	16
	1 Introduction	17
	1.1 Introduction to Molecular Metal Oxides	17
	1.1.1 General Aspects	17
	1.1.2 Formation of POMs via Self-assembly	20
	1.1.3 Vanadium-based Polyoxometalates	21
	1.2 Introduction to Lithium-ion Batteries	25
	1.2.1 Electrochemical Fundamentals	26
	1.2.2 State-of-the-art LIBs	30
	1.2.3 POMs in Electrochemical Energy Storage Application	33
	1.3 Short Introduction to Key Measurement Techniques	36
	1.3.1 X-ray Diffraction	36
	1.3.2 Scanning Electron Microscopy	37
	1.3.3 Infrared Spectroscopy	38
	1.3.4 Cyclic Voltammetry	39
	1.3.5 Galvanostatic Testing	39
	2 Objective	41
	3 Results and Discussion	43
	3.1 Synthesis and Characterization of DMA{V10}	43
	3.1.1 Removal of Crystal Water and Structural Stability	48
	3.1.2 Morphological Characterization	52
	3.1.3 XPS measurement	54
	3.2 DMA{V10} as Cathode Material	58
	3.2.1 Electrochemical Characterization	64
	3.2.2 Post-mortem Analysis	75
	3.3 Dehydrated DMA{V10} as Cathode Material	78
	3.3.1 Electrode Preparation	79
	3.3.2 Electrochemical Characterization	80
	3.3.3 Post-mortem Analysis	89
	4 Conclusion	91
	5 Experimental	96
	5.1 Material	96
	5.2 Instrumentation	97
	5.2.1 Material and Structural Characterization	97
	5.2.2 Electrochemical Characterization	98
	5.3 Synthesis and Characterization	99
	5.3.1 Synthesis of (DMA{V10}	99
	5.3.2 Thermal Dehydration of (DMA{V10}	100
	5.3.3 Thermal Decomposition of (DMA{V10}	101
	5.4 Electrode Preparation	102
	5.4.1 Electrode Preparation: E-70	102
	5.4.2 Electrode Preparation: E-40	106
	5.4.3 Electrode Preparation: E-120-70	109
	5.4.4 Electrode Preparation: E-120-40	111
	5.5 Crystal Data of (C2H8N)5Li[V10O28]·5H2O	115
	References	116