Abstract: Cement-based batteries show great application potential in fields such as green energy storage buildings and intelligent concrete. To address the problems of poor conductivity and weak energy storage of cement, this study incorporated conductive activated carbon and LaCoO₃ nano-powder into the cement matrix to prepare LaCoO₃/activated carbon/cement-based electrodes with different doping amounts. Through physical and chemical characterizations such as X-ray diffraction (XRD), scanning electron microscopy (SEM), and X-ray energy dispersive spectroscopy (EDS), combined with electrochemical performance tests including cyclic voltammetry (CV), galvanostatic charge-discharge (GCD), and electrochemical impedance spectroscopy (EIS), the results show that LaCoO₃ and activated carbon form a uniformly distributed porous three-dimensional network structure in cement. All electrodes exhibit excellent electrochemical performance. With the increase of LaCoO₃ and activated carbon doping amount, the specific capacitance of the electrode increases first and then decreases (maximum to 1.20 F/g), and the resistance decreases first and then increases (minimum to 22.6 Ω). The study indicates that the appropriate addition of LaCoO₃ can endow cement with pseudocapacitance characteristics and enhance its energy storage capacity.

Key words: cement, LaCoO₃, electrode, capacitor, specific capacitance, electrochemistry, resistance