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2020 | Buch

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Novel Decavanadate Compounds for Lithium-Ion Batteries

En Route Towards a New Class of High-performance Energy Materials

verfasst von: Simon Greiner

Verlag: Springer Fachmedien Wiesbaden

Buchreihe : BestMasters

Enthalten in: Springer Professional "Wirtschaft+Technik" , Springer Professional "Technik"

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Über dieses Buch

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.

Inhaltsverzeichnis

Frontmatter

Chapter 1. Introduction

Abstract

Polyoxometalates (POMs) are anionic molecular metal oxides of early transition metals, mainly tungsten, molybdenum and vanadium, in their highest oxidation states with the general formula [M_xO_y]^n–. They consist of polyhedral building blocks with the formula [MO_z]^m– (z = 4 - 7) which are connected by one (corner-sharing), two (edge-sharing) or seldom three (face-sharing) bridging μ-O atoms as shown in Fig. 1.1.^[1] The transition metal atoms building the cluster framework are called addenda atoms.

Simon Greiner

Chapter 2. Objective

Abstract

Driven by the growing demand for high-performance batteries in mobile applications, electric vehicles as well as grid storage, novel electrode materials for LIB and Post-LIB technologies are required in the near and long-term future. Although current cathode materials offer high energy densities in LIB, future technologies require further enhanced capacities, higher security, lower cost and environmentally friendlier raw materials. Most of the current electrode materials are further not suitable for Post-LIB technologies.

Simon Greiner

Chapter 3. Results and Discussion

Abstract

As mentioned in section 1.2.3, Li₆[V₁₀O₂₈]·16H₂O is decomposing during the standard electrode preparation. This could in part be due to the loss of the crystal water molecules, which stabilize the decavanadate units in the crystal structure via hydrogen bonds. Upon removal of the water molecules the separated decavanadate units form solid-state oxides, which have been shown to be LiVO₃ and LiV₃O₈.^[83] Both oxides differ severely from decavanadate regarding the coordination sphere of vanadium and the overall structure.

Simon Greiner

Chapter 4. Conclusion

Abstract

En route towards green and sustainable energy supplies as well as the demand for mobile devices require novel cathode materials with high capacity, stability, low cost and based on abundant materials. Polyoxovanadates with their high redox activity, low cost and weight and high abundance, are highly promising candidates for such cathode active materials. Recent results, however, question the presence of molecular vanadium oxide species in so-far published literature regarding LIB electrodes.

Simon Greiner

Chapter 5. Experimental

Abstract

Unless specified otherwise reagents and chemicals were supplied by Sigma Aldrich, Alfa Aesar, Merck and VWR in standard reagent grade quality. The materials were used without further purification. Unless noted otherwise, the reactions were carried out under ambient conditions.

Simon Greiner

Backmatter

Titel: Novel Decavanadate Compounds for Lithium-Ion Batteries
verfasst von: Simon Greiner
Verlag: Springer Fachmedien Wiesbaden
Electronic ISBN: 978-3-658-28985-0
Print ISBN: 978-3-658-28984-3
DOI: https://doi.org/10.1007/978-3-658-28985-0

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