Electrochemical Characterization of Battery-Supercapacitor Hybrid Based on Li<sub>4</sub>Ti<sub>5</sub>O<sub>12 </sub>and Ti<sub>3</sub>C<sub>2</sub>

Abstract

Battery-supercapacitor hybrids (BSHs) are promising energy storage devices that exhibit large energy density, high power density. In this research, BSH devices based on Li4Ti5O12 and Ti3C2 electrodes are fabricated. Through cyclic voltammetry, it is discovered that the kinetics of charging/discharging are diffusion-controlled. 3D Bode plots and Nyquist Plots indicate that bounded diffusion might occur. Regarding the performance, the 70 wt.% Li4Ti5O12-Ti3C2 BSH shows the most balanced specific energy (9.9 mW∙h/kg) and specific power (3.0 W/kg) at 100 mV/s. The largest specific capacitance of the 70 wt.% Li4Ti5O12-Ti3C2 BSH is 81.6 F/kg at 5 mV/s.