A5012780458- Advancements in Battery Materials
- Advanced Battery Materials and Technologies
- Advanced Battery Technologies Research
- Supercapacitor Materials and Fabrication
- Extraction and Separation Processes
- Advanced battery technologies research
- Fuel Cells and Related Materials
- Conducting polymers and applications
- Parallel Computing and Optimization Techniques
- Electron and X-Ray Spectroscopy Techniques
- Clay minerals and soil interactions
- Semiconductor materials and devices
- Ionic liquids properties and applications
- Geochemistry and Geologic Mapping
- Advanced Sensor and Energy Harvesting Materials
- Pain Management and Opioid Use
- Drilling and Well Engineering
- Software System Performance and Reliability
- Machine Learning in Materials Science
- Cloud Computing and Resource Management
- Drug Solubulity and Delivery Systems
- Concrete and Cement Materials Research
- Ammonia Synthesis and Nitrogen Reduction
- Inorganic and Organometallic Chemistry
- Hydraulic Fracturing and Reservoir Analysis
Uppsala University
2012-2025
Paul Scherrer Institute
2012-2021
Center of Research and Technologic Development in Electrochemistry
2018
Swiss Light Source
2015
University of Waterloo
2014
National Institute for Nanotechnology
2014
Regional Municipality of Waterloo
2014
Equinor (Norway)
2005
Aarhus University Hospital
1987
Peering into cathode layered oxides The quest for better rechargeable batteries means finding ways to pack more energy a smaller mass or volume. Lithium are promising class of materials that could double storage capacities. However, the design safe and long-lasting requires an understanding physical chemical changes occur during redox processes. McCalla et al. used combination experiments calculations understand formation O-O dimers, which key improving properties these materials. Science ,...
The demand for rechargeable batteries with high gravimetric and volumetric energy density will continue to grow due the rapidly increasing integration of renewable into global scheme. In terms density, modern high-end rechargeable-battery technology is reaching its fundamental limits no big advancement leaps in this field are expected. energy-cost model, developed comparative evaluation battery cell chemistries a commercial type pouch configuration, helps us find relationship between cost...
Abstract The intercalation of solvated sodium ions into graphite from ether electrolytes was recently discovered to be a surprisingly reversible process. mechanisms this “cointercalation reaction” are poorly understood and commonly accepted design criteria for electrodes do not seem apply. excellent reversibility despite the large volume expansion, small polarization puzzling role solid electrolyte interphase (SEI) particularly striking. Here, in situ electrochemical dilatometry, online mass...
High-voltage aqueous electrolyte based supercapacitors (U > 1.23 V) attract significant attention for next-generation high power, low cost and environmentally friendly energy storage applications. Cell ageing is however markedly pronounced at elevated voltages results in accelerated overall performance fade increased safety concerns. Online electrochemical mass spectrometry, combined with cell pressure analysis, the first time shown to provide a powerful means situ investigation of...
The chemical and electrochemical instabilities of LiPF6 in carbonate electrolytes for Li-ion batteries were studied with online mass spectrometry (OEMS). Decomposition based on eventually results the formation POF3, which is readily detected followed situ during operation Li-rich HE-NCM-based cells. Electrode potentials above ∼4.2 V leads to solvent oxidation presumably ROH species, subsequently hydrolyze salt initiate a thermally activated autocatalytic electrolyte decomposition cycle...
A new nanostructured metallic metal oxide shows excellent ORR/OER properties in a Li–air cell, and highlights the importance of controlling cathode interface to achieve better Li–O<sub>2</sub>cell round-trip efficiency.
A new lithium‐ether‐derived chelate ionic liquid is synthesized to serve as an electrolyte for the Li‐O 2 battery that stable metallic lithium, and whose ethereal framework much more inherently superoxide‐initiated hydrogen abstraction than simple glyme, dimethoxyethane (DME). Reactions of chemically generated superoxide with this show virtually no decomposition products such lithium formate are generated. When employed in a battery, ten‐fold decrease CO evolution evident on charge by...
The lithium (de)-insertion mechanism from LiNi0.80Co0.15Al0.05O2 (NCA) has been investigated by means of combined electrochemical analysis, operando differential mass spectrometry (DEMS) experiments, and in situ X-ray diffraction (XRD) experiments during the first three cycles. Qualitative analysis cyclic voltammetry data illustrated a possible irreversible activation material. Operando DEMS internal cell pressure measurements with ex XRD impedance spectroscopy demonstrated that Li2CO3...
Abstract This roadmap presents the transformational research ideas proposed by “BATTERY 2030+,” European large‐scale initiative for future battery chemistries. A “chemistry‐neutral” to advance research, particularly at low technology readiness levels, is outlined, with a time horizon of more than ten years. The centered around six themes: 1) accelerated materials discovery platform, 2) interface genome, integration smart functionalities such as 3) sensing and 4) self‐healing processes....
Li-rich oxides continue to be of immense interest as potential next generation Li-ion battery positive electrodes, and yet the role oxygen during cycling is still poorly understood. Here, complex electrochemical behavior Li4FeSbO6 materials studied thoroughly with a variety methods. Herein, we show that release occurs at distinct voltage plateau from peroxo/superoxo formation making this material ideal for revealing new aspects redox processes in oxides. Moreover, directly demonstrate...
The recent revival of the Na-ion battery concept has prompted intense activities in search for new Na-based layered oxide positive electrodes. largest capacity to date was obtained a Na-deficient that relies on cationic redox processes only. To go beyond this limit, we decided chemically manipulate these compounds way trigger participation anionic network. We herein report electrochemical properties Na-rich phase Na2IrO3, which can reversibly cycle 1.5 Na+ per formula unit while not...
Lithium-rich mixed metal layered oxides constitute a large class of promising high-potential positive electrode materials in which higher specific charges are accessed only by activation the Li2MnO3 domains. During activation, oxygen is extracted from oxide and evolves at electrode–electrolyte interface. Differential electrochemical mass spectrometry was employed to follow volatile species developed during cycling. Although typical Li-ion aprotic carbonate electrolytes already suffer...
Nickel-rich layered lithiated Ni–Co–Mn oxides (NCMs) are emerging as the most promising candidates for next-generation Li-ion battery cathodes. Progress, however, is hindered by an incomplete understanding of processes that lead to performance-limiting impedance growth and reduced cycling stability. These typically involve surface reconstruction O2 release at cathode surface, both which difficult monitor in working cell. We demonstrate online electrochemical mass spectrometry can be used...
In situ and operando Raman spectroscopy is proposed to provide unique means for deeper fundamental understanding further development of layered transition metal LiMO2 (M=Ni,Co,Mn) oxides suitable Li-ion battery applications. We compare several spectro-electrochemical cell designs suggest key experimental parameters obtaining optimum electrochemical performance spectral quality. Studies the most practically relevant compositions are exemplified with particular focus on two approaches: (1)...
Disordered rock salt cathodes showing both anionic and cationic redox are being extensively studied for their very high energy storage capacity. Mn-based disordered compounds show much higher efficiency compared to the Ni-based materials as a result of different voltage hysteresis, 0.5 2 V, respectively. To understand origin this difference, we herein report design two model compounds, Li1.3Ni0.27Ta0.43O2 Li1.3Mn0.4Ta0.3O2, study charge compensation mechanism through uptake removal Li via an...
The local structure evolution of LixNi0.8Co0.15Al0.05O2 (NCA) is linked to its electrochemical response during cycling (and overcharge) by operando Raman spectroscopy with findings supported complementary techniques, such as online mass spectrometry (OEMS) and density functional theory (DFT) phonon calculations. vibrational motion lattice oxygens observed be highly dependent on the LixMO2 environment, e.g. M—O bonding strength/length state lithiation x. All modes generally harden upon...
We study the stability of several diglyme-based electrolytes in sodium|sodium and sodium|graphite cells. The electrolyte behavior for different conductive salts [sodium trifluoromethanesulfonate (NaOTf), NaPF6, NaClO4, bis(fluorosulfonyl)imide (NaFSI), sodium bis(trifluoromethanesulfonyl)imide (NaTFSI)] is compared and, some cases, considerable differences are identified. Side reactions studied with a variety methods, including X-ray diffraction, scanning electron microscopy, transmission...
In Li-ion batteries, Li4Ti5O12 (LTO) has merits of an excellent cycling stability combined with a safe working potential 1.55 V vs. Li+/Li at which no adverse side-reactions the electrolyte are expected. Concerns regarding gassing LTO, especially elevated temperatures, have however recently been reported. this work, LTO behavior 50°C is investigated by in situ pressure and online electrochemical mass spectrometry (OEMS), allowing for both qualitative quantitative analysis evolving gases. H2,...
Organic carbonates are the predominant electrolyte base used in best Li- and Na-ion battery systems. However, to date, their precise interactions with electrode not fully understood. Here, we elucidate role of a prototypical additive, fluoroethylene carbonate (FEC), batteries illustrate its influence on solid interphase (SEI) composition. Through use bulk surface analytical techniques, find that early FEC decomposition forms surface-passivating constituent (Na2CO3), reduces rate propylene...
Although layered transition metal oxides are state-of-the-art cathode active materials for Li-ion batteries, many fundamental aspects of their operation poorly understood, in particular, how the local lattice structure and composition influence electrochemical activity. In this work, redox activity Ni-rich LixNi1–2yCoyMnyO2 (y = 0.1, 0.2, 0.33, abbreviated as NCM811, NCM622, NCM111, respectively) cathodes characterized under standard overcharge operating conditions with a recently developed...
The electrolyte additives vinylene carbonate (VC) and fluoroethylene (FEC) are well known for increasing the lifetime of a Li-ion battery cell by supporting formation an effective solid interphase (SEI) at anode. In this study combined simultaneous electrochemical impedance spectroscopy (EIS) operando quartz crystal microbalance with dissipation monitoring (EQCM-D) employed together in situ gas analysis (OEMS) to influence VC FEC on passivation process properties carbon-based anodes. small...
Layered TiS2 has been proposed as a versatile host material for various battery chemistries. Nevertheless, its compatibility with aqueous electrolytes not thoroughly understood. Herein, we report on reversible hydration process to account the electrochemical activity and structural evolution of in relatively dilute electrolyte sustainable Li-ion batteries. Solvated water molecules intercalate layers together Li+ cations, forming hydrated phase nominal formula unit Li0.38(H2O)2−δTiS2...
Optimization of cell formation during lithium-ion battery (LIB) production is needed to reduce time and cost. Operando gas analysis can provide unique insights into the nature, extent, duration process. Herein we present development application an Online Electrochemical Mass Spectrometry (OEMS) design capable monitoring evolution consumption in both model coin-cells (Q = 0.72 mAh) with a graphite/electrolyte weight-ratio 1:12.5 large-format Li-ion cells 72 Ah) 1:0.63 operation. Although...
The widening memory gap reduces performance of applications with poor data locality. Therefore, there is a need for methods to analyze locality and help application optimization. In this paper we present StatCache, novel sampling-based method performing data-locality analysis on realistic workloads. StatCache based probabilistic model the cache, rather than functional cache simulator. It uses statistics from single run accurately estimate miss ratios fully-associative caches arbitrary sizes...
An operando electrochemical quartz crystal microbalance with dissipation monitoring (EQCM-D) simultaneous in situ impedance spectroscopy (EIS) has been developed and applied to study the solid electrolyte interphase (SEI) formation on copper current collectors Li ion batteries. The findings are backed by EIS simulations complementary analytical techniques, such as online mass spectrometry (OEMS) X-ray photoelectron (XPS). evolution of mechanical properties SEI directly correlated electrode...