A5083040067- Advancements in Battery Materials
- Advanced Battery Materials and Technologies
- Advanced Battery Technologies Research
- Supercapacitor Materials and Fabrication
- Fiber-reinforced polymer composites
- Extraction and Separation Processes
- Ionic liquids properties and applications
- Graphene research and applications
- Conducting polymers and applications
- Chemical Synthesis and Characterization
- Electron and X-Ray Spectroscopy Techniques
- Semiconductor materials and interfaces
- Geographic Information Systems Studies
- Geotourism and Geoheritage Conservation
- Analytical Chemistry and Sensors
- Thermal Expansion and Ionic Conductivity
- Online Learning and Analytics
- Semiconductor materials and devices
- Molecular Junctions and Nanostructures
- Fuel Cells and Related Materials
- Inorganic Fluorides and Related Compounds
- Historical and Scientific Studies
- Marine and environmental studies
- Atmospheric and Environmental Gas Dynamics
- Molten salt chemistry and electrochemical processes
University of Münster
2013-2020
Helmholtz-Institute Münster
2013-2020
Forschungszentrum Jülich
2017-2020
Battery Park
2014-2017
Augenstern
2014
We present highly promising results for the use of graphite as both electrodes in a “dual-carbon” cell. An ionic liquid-based electrolyte mixture allows stable and reversible ion intercalation/de-intercalation into/from electrodes.
Abstract Electrochemical energy storage at a large scale poses one of the main technological challenges this century. The scientific community in academia and industry worldwide intensively is exploring various alternative rechargeable battery concepts beside state‐of‐the‐art lithium ion batteries (LIBs), for example, all‐solid‐state batteries, lithium/sulfur magnesium/sulfur or dual‐ion that could outperform LIBs different aspects. Often, these also promise very high theoretical energies...
In order to increase the energy content of lithium ion batteries (LIBs), researchers worldwide focus on high specific (Wh/kg) and density (Wh/L) anode cathode materials. However, most attention is primarily paid gravimetric and/or volumetric capacities these materials, while other key parameters are often neglected. For practical applications, in particular for large size battery cells, Coulombic efficiency (CE), voltage (VE), (EE) have be considered, which we point out this work by...
In a lithium ion battery, balancing of active materials is an essential requirement with respect to safety and cycle life. However, capacity oversizing negative electrodes associated decrease specific energy/energy density. this work, the required trade-off between maximized energy minimized risk plating thoroughly investigated by evaluating underlying potential/voltage curves. The adjustment targeted state charge (SOC) for both, positive electrode, can be achieved intentional selection only...
At high potentials of >4.5 V <italic>vs.</italic> Li/Li<sup>+</sup>, graphitic structures in carbon black can provide host sites for the partially reversible intercalation electrolyte salt anions. To avoid this reaction, graphitization degree blacks must be optimized.
Abstract Graphite is a redox‐amphoteric intercalation host and thus capable to incorporate various types of cations anions between its planar graphene sheets form so‐called donor‐type or acceptor‐type graphite compounds (GICs) by electrochemical at specific potentials. While the LiC x /C redox couple major active compound for state‐of‐the‐art negative electrodes in lithium‐ion batteries, GICs were proposed positive “dual‐ion” “dual‐graphite” cell, another type energy storage system. In this...
Electrochemical energy storage devices utilizing graphitic carbons as positive electrode material have been proposed "dual-ion cells". In this type of electrochemical cell, the electrolyte does not only act a charge carrier, but additionally active material. process, lithium ions are inserted/intercalated or deposited into/on negative electrode, e. g. Li4Ti5O12, graphite metallic lithium, and anions intercalated into electrode. discharge both released back electrolyte. We report herein on...
The inability of imide salts to form a sufficiently effective passivation layer on aluminum current collectors is one the main obstacles that limit their broad application in electrochemical energy-storage systems. However, under certain circumstances, use electrolytes with electrolyte combination collector possible. In this contribution, stability containing either lithium bis(trifluoromethanesulfonyl) (LiTFSI) or fluorosulfonyl-(trifluoromethanesulfonyl) (LiFTFSI) as conductive salt was...
Dual-graphite cells have been proposed as electrochemical energy storage devices using graphite both, the negative and positive electrode. In this setup, electrolyte cations intercalate into anode anions cathode during charge. On discharge, are released back electrolyte. contribution, intercalation of bis(trifluoromethanesulfonyl) imide anion (TFSI - ) various graphites from an ionic liquid-based electrolyte, namely N-butyl-N-methylpyrrolidinium (Pyr 14 TFSI), was studied. The focus...
Adv. Energy Mater. 2019, 9, 1803170 The calculation spreadsheet in the supporting information of original manuscript contained an error, which had minor implications on calculated volumetric energy content discussed battery technologies. Therefore, corrections and resulting values were made. results slightly change data used to calculate Figure 8b. error was related thickness variation cell stacks due volume changes active materials during charge/discharge. In case LSBs, included expansion...
Solid electrolytes can be the key for desired goal of increased safety and specific energies batteries. On a cell battery pack level, all-solid nature absence liquid electrolyte leakage are considered to enable safe effective performance realization rechargeable Li metal electrode bipolar stacking, respectively. Well performing cells with high-energy/voltage positive electrodes such as LiNi0.6Mn0.2Co0.2O2 (NMC622) already cycled when using blend sulfidic solid β-Li3PS4 (LPS) salt in...
Dual-ion cells based on the anion intercalation into a graphite positive electrode have been proposed as electrochemical energy storage devices. In this set-up, electrolyte, in case mixture of N -butyl- -methylpyrrolidinium bis(trifluoromethanesulfonyl) imide (Pyr 14 TFSI) and lithium (LiTFSI) acts not only charge carrier, but also active material. Since compatibility ionic liquid-based electrolyte with graphitic anodes is relatively poor sufficient, selection anode materials for dual-ion...
Abstract The formation of the solid electrolyte interphase (SEI) and corresponding irreversible capacity ( C irr ) graphite negative electrodes in lithium-ion batteries strongly depend on surface morphology chemistry respective material. In particular, not only BET specific area but also absolute relative extent basal plane “non-basal plane” play a crucial role SEI formation, as transport lithium ions into/from anode during charge/discharge operation mainly takes place via prismatic...
Different types of carbonaceous materials, such as graphite and carbon black, are typically used conductive additives in composite electrodes for lithium-ion cells. Since the next generation cathode so-called 5 V materials like LiCoPO 4 , operate at potentials above 4.5 vs. Li/Li + issue anion intercalation into additive needs to be seriously considered. The from organic-solvent based electrolytes more graphitic carbons can accompanied by a solvent co-intercalation reaction, which may lead...
Abstract The chemical compatibility of the various compounds and elements used in lithium‐based batteries dictates their safe operation parameters performance. lithium salt Li‐bis(trifluoromethanesulfonyl)imide (LiTFSI) has many advantages over common LiPF 6 as it does not react with water impurities to form, for example, hydrofluoric acid. To further accommodate safe‐operation chemistry, we use a non‐volatile disiloxane‐based solvent 1,3‐bis(cyanopropyl)tetramethyldisiloxane (TmdSx‐CN)....
Abstract We report on the reversible (de)intercalation of TFSI − anions from a Mg‐based ionic liquid electrolyte, Mg(TFSI) 2 in Pyr 14 TFSI, graphite activated carbon hybrid dual‐ion capacitor (DIC) cells. The role different pseudo reference electrodes (PREs) including Ag‐wire and Li metal is discussed regarding comparability battery show that an PRE not suitable for designated purpose, while use results high reproducibility. DIC cells are compared with based pure LiTFSI‐Pyr electrolytes,...
In this work, carbon spheres having an average particle diameter of 0.6 µm were prepared by a simple hydrothermal synthesis method using glucose as precursor. These carbonized and graphitized at different temperatures, namely 1200 °C, 2100 2400 °C 2800 in order to study the impact structural properties, i.e. morphology degree graphitization, on TFSI - anion intercalation behavior into these carbons used cathode material dual-ion cells. The properties spheres, such size, surface morphology,...