Publications

This paper presents an efficient and comprehensive method for measuring and understanding the self-discharge behaviour of LiB cells, considering factors such as temperature and cell to cell variability, as well as underlying electrochemical mechanisms. The innovative approach presented in this paper aims to revolutionize the way we understand and engineer LiB cells, potentially leading to more efficient, longer-lasting, and sustainable energy storage solutions.

This paper introduces two novel ideas on Supercaps (SCs) characterization and modeling, 1) a novel measurement method for the determination of the non-linear leakage resistance of SCs, and 2) a novel approach for accurately modeling SCs by means of a Three-Branch circuit model. Through these two innovations the accuracy of the SCs simulation reaches very high levels. The determination of the non-linear leakage resistance occurs in two steps. The method relies on using an auxiliary resistor in a repeated discharging phase. A new model identification method based on the state equations of the circuit is described in the paper and validated by measurements.

The publication details a refined laser-based method for creating highly conductive graphene films used in microflexible supercapacitors. This method significantly improves the performance and durability of these supercapacitors, making them suitable for advanced applications in paper electronics and smart textiles.This promising laser-based approach emerges as a viable alternative for the fabrication of microflexible interdigitated supercapacitors for paper electronics and smart textiles.

This study examines the electrochemical performance of carbon-based supercapacitors with ionic liquid electrolytes, utilizing calibrated impedance spectroscopy and FEM modelling. Results are assessed for activated carbon electrodes against advanced graphene electrodes, with FEM simulations revealing how electrode structure influences ion transport mechanisms. These insights are valuable for optimizing supercapacitor electrode materials and advancing energy storage technologies.

The capacity of a supercapacitor (SC) is not constant but varies with the charging voltage and the charging time. The standards (e.g. EN IEC 62391) propose conventional methods for calculating the capacity, usually after a 30 minutes charging and a constant current discharging. This conventional value is considered constant. Actually, a good electrical representation of a SC must include a small network with two or more branches, otherwise the calculation of the charging, discharging and cycles is only approximate. In the paper a method is proposed to combine the repeatability of a trained SC, the measurement accuracy of voltage and current and obtain an evaluation of the uncertainty of the equivalent circuit parameters. The method is general, even if in the paper it is applied to a three-branch equivalent circuit.