Batteries & Supercaps最新文献

The Cover Feature shows how recessed microelectrodes were employed as a versatile binder-free platform to investigate the electrochemical performance of Prussian Blue analogues (PBA), a class of promising battery materials, concerning capacity in varying aqueous electrolytes. To corroborate the micro-electrochemical findings, both ex-situ and operando chemical characterizations were conducted, offering complementary insights into the structural and chemical evolution of the PBA material during electrochemical cycling. More information can be found in the Research Article by W. Schuhmann and co-workers (DOI: 10.1002/batt.202400743).

The Front Cover highlights a study that explored how carbon electrode modifications and bismuth deposition affect performance in KCrPDTA/K₄Fe(CN)₆ flow batteries. Larger bismuth deposits that form on thermally activated electrodes reduce the Coulombic efficiency due to enhanced hydrogen evolution, whereas smaller deposits improve the overall efficiency. These findings highlight the importance of controlling catalyst morphology to balance power output and cell longevity. More information can be found in the Research Article by D. Reber and co-workers (DOI: 10.1002/batt.202400696).

The Front Cover illustrates the five key electrolytes discussed in this Review of green aqueous ion batteries by Y.-E. Sung, S.-H. Yu and co-workers (DOI: 10.1002/batt.202400579). At the center of the illustration is a cylindrical aqueous battery, symbolizing the paper's two major themes: high-energy and low-temperature operation. It is placed in the middle of a green forest, surrounded by hydrogel, eutectic, additive/cosolvent, water-in-salt, and molecular crowding electrolytes.

The Cover Feature showcases the manufacturing journey of solid-state battery composite electrodes, capturing the transition of the microstructure across key stages: slurry, drying, and calendering. It features a modeling workflow for battery cathodes composed of LiNi_0.8Mn_0.1Co_0.1O₂ and Li₆PS₅Cl, unveiling the impact of processing on microstructural evolution, with results validated against experimental data. More information can be found in the Research Article by A. A. Franco and co-workers (DOI: 10.1002/batt.202400709).

The Cover Feature represents the whole ARTISTIC project workflow to optimize battery manufacturing process parameters. Synthetic data (produced by the physics-based manufacturing modeling chain) and experimental data are used to train surrogate models by using different machine learning techniques at the different manufacturing stages: mixing & slurry, coating & drying, calendering, electrolyte filling and performance. Then, optimizers, such as Bayesian, are used to determine the best input parameters to optimize output battery properties. More information can be found in the Concept by A. A. Franco and co-workers (DOI: 10.1002/batt.202400385).

The Cover Feature represents the application of MXene-based ternary hybrids to supercapacitors due to their better physicochemical properties, including high conductivity, expansive surface area, and abundant redox-active sites. The 3D ternary hybrid structure was engineered by combining metallic VSe₂, Ti₃C₂Tx MXene, and carbon nanotubes to overcome the limitations typically encountered with 2D-material-based electrodes in supercapacitor applications. More information can be found in the Research Article by S. M. Jeong, C. S. Rout and co-workers (DOI: 10.1002/batt.202400466).

The Front Cover illustrates the impact of chloride ions on magnesium deposition/dissolution on copper electrodes by using a semi-solid electrolyte based on a metal–organic framework. Chloride ions enhance magnesium dissolution, dissolving the copper surface and forming active sites for magnesium deposition. Galvanostatic cycling induces pitting corrosion and nanoparticle formation. More information can be found in the Research Article by H. K. Hassan, T. Jacob and co-workers (DOI: 10.1002/batt.202400420).

The determination of the intrinsic properties of solid active material candidates is essential for their performance optimization. However, macroscopic electrodes and related analytical techniques show challenges concerning the number of additional influencing parameters. We explore recessed microelectrodes (rME) as a platform that allows for a binder-free investigation of Prussian Blue analogues (PBA), a family of promising battery materials. The enhanced diffusion using microelectrochemical tools is indispensable to assess the intrinsic material performance, overcoming the limitation of cation diffusion from the electrolyte to the solid interface during (dis)charging cycles and allowing the investigation of limiting steps in the coupled ion-electron transfer process. The intrinsic electrochemical performance of PBAs was studied in a three-electrode configuration by means of cyclic voltammetry and galvanostatic (dis)charging in aqueous Na⁺-containing electrolyte. We extended the evaluation to the role of the electrolyte on the performance of cathodic and anodic processes of a Mn-based PBA. Ex-situ and operando chemical characterization were coupled to support the microelectrochemical results.

Methyl viologen (MV) and its derivatives are emerging as promising candidates within the organic redox flow battery community due to their commendable reversibility and rapid reaction kinetics. However, experimental observations reveal the influence of solute concentration on the diffusion coefficient and the tendency of MV⁺ to form dimers or multimers, affecting electrolyte viscosity. Traditional characterization methods may not fully capture these properties. To explore concentration and state of charge effects on diffusion coefficient and viscosity, a kinetic Monte Carlo (kMC) model coupled with mean square displacement analysis is introduced. The kMC model offers a 3D simulation space with expandable periodic boundary conditions, enabling realistic ion movement. The mean square displacement (MSD) algorithm extracts diffusion coefficients, followed by the estimation of the electrolyte viscosity using the Stokes-Einstein equation. Validation with NaCl solutions precedes adaptation to simulate MV⁺⋅diffusion coefficients at 1.5 M with varying states of charge (SoC), aligning with experimental data. Simulation results indicate increased multimerization at higherSoCs. The diffusion coefficient of fully charged MV⁺⋅decreases with electrolyte concentration due to dimer and multimer formation. This modeling approach provides insights into MV⁺⋅behavior, crucial for organic redox flow battery development.

The Cover Feature illustrates the optimized structures for lithium adsorbed on pristine and defective graphdiyne (GDY) nanosheets. The upper part (left) of the picture shows a perfect layer decorated with lithium (green), to the right is a plot of the charge density difference, showing a uniform distribution and a charge transfer from the lithium at one vertex. The lower part presents the structure after introducing a carbon vacancy showing a distortion, charge transfer from Li atoms and an asymmetric charge density difference that moves to the three connecting carbon atoms (blue). More information can be found in the Research Article by A. Juan and co-workers (DOI: 10.1002/batt.202400514).