A5038424709- Advanced Battery Materials and Technologies
- Advancements in Battery Materials
- Advanced Battery Technologies Research
- Extraction and Separation Processes
- Block Copolymer Self-Assembly
- Conducting polymers and applications
- Advanced MRI Techniques and Applications
- Chemical and Physical Properties in Aqueous Solutions
- Chemical Synthesis and Characterization
- Electrocatalysts for Energy Conversion
- Fuel Cells and Related Materials
- Thermal and Kinetic Analysis
- Polymer Nanocomposites and Properties
- Polymer crystallization and properties
- Lanthanide and Transition Metal Complexes
- Membrane Separation and Gas Transport
- Advanced battery technologies research
The Faraday Institution
2020-2023
University of Oxford
2020-2023
Columbia University
2023
University of California, Berkeley
2018-2020
Abstract Models that predict battery lifetime require knowledge of the causes degradation and operating conditions accelerate it. Batteries experience two ageing modes: calendar at rest cyclic during passage current. Existing empirical models treat these as independent, but may be sensitive to their order periodicity – a phenomenon has been called “path dependence”. This experimental study path dependence probes whether interactions between can impact battery's state health. Groups...
The Doyle-Fuller-Newman framework is the most popular physics-based continuum-level description of chemical and dynamical internal processes within operating lithium-ion-battery cells. With sufficient flexibility to model a wide range battery designs chemistries, provides an effective balance between detail, needed capture key microscopic mechanisms, simplicity, solve governing equations at relatively modest computational expense. Nevertheless, implementation requires values numerous...
We present experimental results on the phase behavior of block copolymer/salt mixtures over a wide range copolymer compositions, molecular weights, and salt concentrations. The system comprises polystyrene-block-poly(ethylene oxide) lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) salt. It is well established that LiTFSI interacts favorably with poly(ethylene relative to polystyrene. relationship between chain length composition at fixed temperature U-shaped, as seen in experiments...
Superconcentrated electrolytes, being highly thermodynamically nonideal, provide a stringent proving ground for continuum transport theories. Herein, we test an ostensibly complete model of LiPF6 in ethyl-methyl carbonate (EMC) based on the Onsager–Stefan–Maxwell theory from irreversible thermodynamics. We perform synchronous magnetic resonance imaging (MRI) and chronopotentiometry to examine how superconcentrated LiPF6:EMC responds galvanostatic polarization open-circuit relaxation....
The design and engineering of composite materials is one strategy to satisfy the needs systems with multiple orthogonal property requirements. In case rechargeable batteries lithium metal anodes, system requires a separator fast ion transport good mechanical strength. this work, we focus on polystyrene-block-poly(ethylene oxide) (SEO) bis(trifluoromethane)sulfonimide salt (LiTFSI). Ion occurs in salt-containing poly(ethylene oxide)-rich domains. Mechanical rigidity arises due glassy nature...
Liquid lithium-battery electrolytes universally incorporate at least two solvents to balance conductivity and viscosity. Almost all continuum models treat cosolvent systems such as ethylene carbonate:ethyl-methyl carbonate (EC:EMC) single entities whose constituents travel with identical velocities. We test this "single-solvent approximation" by subjecting LiPF6:EC:EMC blends constant-current polarization in Hittorf experiments. A Gaussian process regression model trained on physicochemical...
Most liquid lithium-ion-battery electrolytes incorporate cosolvent blends, but the dominant electrochemical transport models adopt a single-solvent approximation, which assumes in part that nonuniform ratios do not affect cell voltage. For popular electrolyte formulation based on ethyl-methyl carbonate (EMC), ethylene (EC), and LiPF6, we perform measurements with fixed-reference concentration cells, finding appreciable liquid-junction potentials when only ratio is polarized. A previously...
Block copolymer electrolytes have been shown to increase the cycle life of rechargeable batteries that utilize high capacity lithium anodes. Most block electrolyte studies centered on polystyrene-b-poly(ethylene oxide) (SEO) mixed with bis(trifluoromethanesulfonyl)imide (LiTFSI) salt and are limited concentrations in vicinity r ≡ [Li]/[EO] = 0.1, where [Li] [EO] concentration ethylene oxide moieties, respectively, as conductivity poly(ethylene (PEO) homopolymer is maximized at this...
ADVERTISEMENT RETURN TO ISSUEPREVEnergy FocusNEXTFostering a Sustainable Community in BatteriesJenny A. BakerJenny BakerMore by Jenny Baker, Martin BeuseMartin BeuseMore Beusehttp://orcid.org/0000-0002-1475-5696, Steven C. DeCaluweSteven DeCaluweMore DeCaluwehttp://orcid.org/0000-0002-3356-8247, Linda W. JingLinda JingMore Jinghttp://orcid.org/0000-0003-3835-0295, Edwin KhooEdwin KhooMore Khoohttp://orcid.org/0000-0002-3171-7982, Shashank SripadShashank SripadMore...
Tris-bipyridine iron (II) triflate was synthesized and used as an active species to demonstrate a symmetric disproportionation redox-flow-battery chemistry that works without supporting electrolyte. Solutions of this coordination complex salt (0.1 M in acetonitrile), which the cation provides redox activity, were qualitatively characterized with cyclic voltammetry perform extended full-cell charge/discharge cycling impedance testing reactors containing porous Daramic 175 separator membrane....
Crystallization in an ordered lamellar diblock copolymer/salt mixture, polystyrene-block-poly(ethylene oxide) mixed with lithium bis(trifluoromethanesulfonyl)imide salt (SEO/LiTFSI), has been studied using a combination of small-angle X-ray scattering (SAXS), transmission electron microscopy (TEM), and depolarized light (DPLS). Such materials have applications as electrolyte membranes solid-state batteries. The grain structure the was controlled by manipulating thermal history. Poly(ethylene...
Speed-of-sound measurements are performed to establish how the isentropic bulk modulus Ks of electrolyte system comprising lithium hexafluorophospate (LiPF6) in blends propylene carbonate (PC) and ethyl methyl (EMC) varies with salt molality m, mass fraction PC PC:EMC cosolvent f, temperature T. Bulk moduli calculated by combining acoustic time-of-flight data between parallel walls a liquid-filled cuvette densitometric for sequence binary ternary solutions. Correlations presented yield (m,...
This research provides a comprehensive analysis of the thermodynamic and transport properties lithium hexafluorophosphate (LiPF 6 ) in dimethyl carbonate (DMC), which are critical for performance lithium-ion batteries. We employed advanced techniques to precisely quantify density fluctuations, we then systematically correlated with changes salt concentration temperature. intricate relationship was explicated using data fitting model, conforming tenets Debye–Hückel theory. Through application...
A model of a lithium-ion battery containing cosolvent electrolyte is developed and implemented within the open-source PyBaMM platform. Lithium-ion electrolytes are essential to operation normally contain at least two solvents satisfy performance requirements. The widely used Doyle-Fuller-Newman assumes that comprises salt dissolved in single effective solvent, however. This single-solvent approximation has been disproved experimentally may hinder accurate modelling. Here, we present...
Lithium-metal batteries experience significant mechanical stress as lithium is plated and stripped from the copper current collector during charge discharge, respectively. Minimizing negative effects of this on cell’s capacity retention over its cycle life paramount to propel high-density chemistry mainstream. To address this, acoustics have recently emerged a viable experimental tool monitor chemo-mechanical properties*.* In work, we probe underlying coupled transient phenomena previously...