Research data supporting "Scalable Self-Assembly of Composite Nanofibers into High-Energy-Density Li-Ion Battery Electrodes."

Overview This dataset originates from research investigating the scalable self-assembly of composite nanofibers (NFs) into high-energy-density lithium-ion battery electrodes. The study explores the alignment and electrochemical performance of carbon-decorated vanadium pentoxide (V₂O₅–C) nanofibers under different processing conditions. The dataset includes materials characterization, self-assembly behaviour, and electrochemical performance measurements. The data collection was conducted using scanning electron microscopy (SEM), X-ray diffraction (XRD), thermogravimetric analysis (TGA), zeta potential measurements, and electrochemical testing methods such as galvanostatic cycling and impedance spectroscopy. The dataset is provided mainly in CSV formats, ensuring accessibility and reusability. Figure 1: Nanofiber Characterization Data, including their morphology, crystallinity, thermal stability, and surface charge properties. Methods: XRD Patterns: Crystallographic properties of the nanofibers were analyzed using an X-ray diffractometer. TGA: The thermal stability of the nanofibers was assessed using a thermogravimetric analyzer under an air atmosphere. Zeta Potential: Measurements were conducted using a zeta potential analyzer to evaluate surface charge characteristics in deionized water. Data Format: CSV files. Figures 2, 4, and TOC Fig: Nanofiber Alignment and Density Analysis Methods: Alignment Quantification: The FFT magnitude spectrum of nanofibers was calculated from individual SEM images. Alignment Ratio Calculation: Derived in bulk using Python. The function for deriving the alignment ratio is highlighted in the supplementary information at ACS Nano. Density Measurement (TOC Fig and Fig 4c): Thickness was measured using a high-accuracy calliper, and the weight of the electrode was recorded using an electronic weighing balance. Data Format: CSV files for alignment ratios and density measurements, high-resolution SEM images. Figure 5: Electrochemical Performance Data Methods: Galvanostatic Cycling: Voltage profiles of the first and second formation cycles were recorded at 20 mA g⁻¹. Long-Term Cycling: Volumetric capacity retention over 500 cycles was measured for different electrode compositions. Rate Performance: Gravimetric and volumetric rate capabilities were analyzed. Electrochemical Impedance Spectroscopy (EIS): Impedance characteristics were recorded post-formation. Data Format: Electrochemical data collected using a BioLogic BCS or VMP-3 potentiostat, provided in both CSV and MPT text formats for direct plotting.